Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

anatomy/biology
what substance passes through a cell membrane using a solute pump?
Thursday, September 10, 2009 at 10:31am

Chemistry
Consider the densities of the liquid substances listed. a) How will substance X, a solid, with density of 0.87 g/cm^3, behave when placed in each of the other pure liquids? b) Sketch and label a test tube containing substances A,B,C, and X. Assume that the liquids do not mix ...
Wednesday, September 9, 2009 at 11:35pm

Chemistry
Is the following statement true? Explain fully. "Any sample made up of only one substance is homogeneous."
Wednesday, September 9, 2009 at 11:30pm

11th grade
what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm3
Wednesday, September 9, 2009 at 8:43pm

Chemistry
What would the scientific principle be when the purpose of the lab is to learn and practice techniques and calculations for determining volume and density of a substance?
Wednesday, September 2, 2009 at 4:51pm

Math
In the tests of a new pharmaceutical product, data was collected for use in the approval process requied by the U.S. FDA. Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data is shown: No Help Help Drug 22 47...
Monday, August 3, 2009 at 9:50pm

adult education
I am completing a medical vocab paper. It asked what is the Substance that regulates calcium. what is it?
Tuesday, July 28, 2009 at 5:44pm

Science
1.Is molar mass always done for one mol of substance? Let me make up an example: 2H2(g)+O2(g)--> 2H2O When finding molar mas of water would it be 2(2(1.01)+2(16)) or just 2(1.01)+16? 2. I'm not really sure about endergonic exergonic reaction because my teacher is ...
Monday, July 27, 2009 at 5:52pm

calculus
Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece ...
Friday, July 24, 2009 at 1:11pm

grade 12 chemistry
Solubility equilibrium: is dynamic equilibrium in a saturated solution between excess solute and aqueous solution(solvent) or between crystals and dissolved solute--> no it has to be crystals and solvent right becuase crystals are basically solute not dissolved yet?? ...
Monday, July 20, 2009 at 11:24pm

11th grade
how to check specific heat of a substance?
Tuesday, July 7, 2009 at 9:59am

psychology
Marla is a 42-year-old Hispanic female who comes to the mental health clinic complaining of trouble sleeping, feeling “jumpy all of the time,” and an inability to concentrate. These symptoms are causing problems for her at work, where she is an accountant. ADHD ...
Saturday, July 4, 2009 at 12:50am

chemistry
I had to do this online lab and have a total of 8 questions at the end and I am stuck half way through. Can someone please walk me through the last few question? Here is the Lab and my homework: In this experiment, we will determine the heat of reaction for a neutralization ...
Monday, June 29, 2009 at 7:43pm

Bio-Chemistry
The process of breaking a complex substance down into smaller components is called what?
Monday, June 29, 2009 at 1:57am

science
1) what is the mass of 10 cc of water? 2) why does a block of wood float on water? 3)how and why can density by used to identify an unknown substance? 4) describe the relationship between density, water, an d things that float please help me just need these answers to study ...
Wednesday, June 17, 2009 at 6:18pm

Science
I got the following question wrong on a test "If a substance does not dissolve in water, but dissolves in oil, it is most likely a. polar b. homogeneous c. non-polar d. colloid" (I said A) Now that finals are coming up, I want to know what the answer is to this. ...
Tuesday, June 9, 2009 at 4:43pm

Chem.
Is a substance written HO-C (with a double bond connecting the C to an O north of it)-CH2-CH3 Ethenoic Acid? Thanks!
Sunday, June 7, 2009 at 8:48pm

Chem.
Is the number of branches or carbons more important when determining the boiling point of a substance? I have CH3-CH3 and C3-CH (with a branch leading upward to CH3)-CH3. Thanks for your help.
Sunday, June 7, 2009 at 6:41pm

Chemistry 101
A student needs to run an experiment to determine the amount of substance in the solution. As more of the substance is dissolved, the more red the solution becomes. He is planning on using an absorption spectrometer to measure how much of a wavelength would be absorbed when ...
Monday, June 1, 2009 at 5:37pm

Chemistry please help
Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0 g Mass of water used: 50.0 g (0.05kg) Kf...
Wednesday, May 27, 2009 at 9:15pm

Chem
I need help setting this up, please. What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312–g sample by 15ºC
Wednesday, May 27, 2009 at 11:44am

Legal Aspects of Health Information
Judge Jones is hearing a motion to order release of substance abuse records pursuant to a subpoena....Where should the hearing take place/
Tuesday, May 26, 2009 at 6:00pm

CHemistry
My professor gave us these question in call and we solved for it in class, however im not sure how we got the answers. I dunt really understand the concept of intermolecular forces if some can please help me i have a quiz tomorrow. A. For each pair of substance, identify the ...
Tuesday, May 12, 2009 at 6:23pm

Physics
A portion of an electric circuit connected to a 7 ohm resistor is embedded in 1.20 kg of a solid substance in a calorimeter. The external portion of the circuit is connected to a 100 volt power supply. (a) Assuming that all the heat generated by the resistor is absorbed by the...
Sunday, May 10, 2009 at 5:46pm

chemistry
At a low pressure and a high temperature, what state of a substance is most likely to exist? Gas Liquid Solid
Thursday, May 7, 2009 at 11:04pm

Chemistry
Can someones please check my work? 1. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? A: It takes the shape of its contaienr because its particles can slip past each other. but it has fixed volume and does ...
Thursday, May 7, 2009 at 11:17am

Science (URGENT)
Can someones please check my work? 1. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? A: It takes the shape of its contaienr because its particles can slip past each other. but it has fixed volume and does ...
Thursday, May 7, 2009 at 2:57am

Science (urgent)
Suppose 13.7kJ of heat are removed from 33.5g liquid sample of ethanol at 26.8^oC. When all this heatis removed from the substance, at what temperature and in what states will you find the substance?
Monday, May 4, 2009 at 11:29pm

Chemistry
If 395.3 g of a substance is dissolved in 872.6 g of cyclohexane solvent, the boiling point of the solution is 87.38 oC. Calculate the apparent molar mass (g/mol) of substance.
Monday, May 4, 2009 at 3:45pm

Chemistry
What is the difference between the substance oxidized and the oxidizing agent?
Friday, May 1, 2009 at 9:05am

history
choose one problem in your community that troubles you--for exampple, homelessness, air or water pollution, substance abuse, or toxic waste disposal. Discuss the problem with famiy, friends, and neighbors to get ideas for dealing with it. Write a one-page proposal for a ...
Wednesday, April 29, 2009 at 10:54am

college chemistry - molarity question
My textbook doesn't show me how to do problems like the following, and I'm having a hard time finding similar problems online. Most of the molarity problems I'm finding involve mixing a substance with water, but these involve mixing moles of substances with moles ...
Wednesday, April 29, 2009 at 1:23am

Science
If some substance has a ph of 8, is it a base or is it neutral? I know that a ph of 7 is neutral, so is 8 also neutral since it's in the middle?
Thursday, April 23, 2009 at 4:21pm

chemistry
Contrast ionic and molecular substance in terms of the type of attractive forces that govern their behavior.
Sunday, April 19, 2009 at 11:02pm

chemistry need help
A fellow student say , " All substance experience London disperison forces of attraction between particle." Is this etatement true? Explain your answer
Sunday, April 19, 2009 at 10:26pm

pre lab Q on chromatography
suppose that there are two components, A and B, in a mixture. The chemical affinity of A for the stationary pahse is less than that of B and the chemical affinity of A for the mobile phase is greater than that of B. If the mixture is subjected to paper chromatography, which ...
Sunday, April 19, 2009 at 6:45pm

Science ; Micro-organisms
i have to finished this cross word , and i need help on the last two . So thank you if you can solve it :) A substance that micro organisms can be grown on . its a 4 letter word. A group Of Micro Organisms , its a 6 letter word.
Thursday, April 16, 2009 at 1:55pm

ciminology
Monday 04/13/09 Need help with this.. based on someone's experience with these procedures. Post a 175- to 350-word response restating the events in the proper order. Answer this question as part of your response: 1.) what sources were the rights afforded this individual ...
Monday, April 13, 2009 at 11:22am

Science
A scientist needs to take a picture of the well-ordered arrangements of the atoms and molecules within a substance. What instrument would be best for a scientist to use?
Saturday, April 11, 2009 at 3:50pm

Astronomy
The latent heat of melting is the amount of energy needed to convert a solid substance at its melting temper- ature to a liquid at the same temperature. For typical volcanic rocks, the latent heat of melting is around 5×105 J/kg, which means it takes 5×105 J to ...
Thursday, April 9, 2009 at 1:01am

stats ?
There are 5 situations below. Can someone please match the situations up with the threat. These would be in a quasi-experimental design. The threats are history, maturation, mortality, testing, and instrumentation threat. THANK YOU! A.Kindergarten students who were identified ...
Monday, April 6, 2009 at 12:55pm

STATS ?
There are 5 situations below. Can someone please match the situations up with the threat. These would be in a quasi-experimental design. The threats are history, maturation, mortality, testing, and instrumentation threat. THANK YOU! A.Kindergarten students who were identified ...
Sunday, April 5, 2009 at 1:33pm

stats ?
There are 5 situations below. Can someone please match the situations up with the threat. These would be in a quasi-experimental design. The threats are history, maturation, mortality, testing, and instrumentation threat. THANK YOU! A. Kindergarten students who were identified...
Sunday, April 5, 2009 at 1:31pm

chemistry
The densities of the liquid and solid states of a substance are often similar. Explain.
Thursday, April 2, 2009 at 10:17pm

psychology
1 which statement most accurately differentiates substance dependence from substance abuse? A substance dependence involves ongoing use of a drug despite the problems it causes in the person's functioning. B With substance dependence, the individual uses the drug daily C ...
Thursday, April 2, 2009 at 3:05pm

Chemistry
Suppose 1.0 mol of substance A reacts with 1.0 mol of substance B. to produce 2.0 mol of substance C. In a reaction, 2.4 mol of substance A is allowed to react with 2.1 mol of substance B. What amount in moles of substance c is produced?
Wednesday, April 1, 2009 at 10:22pm

8th Grade Science
If we say that gold has a density of 19.32 g/ml, at what temperature is this substance?
Wednesday, April 1, 2009 at 6:50pm

math
if the rate for radioactive decay for a substance is r=-.0063 and time is being measured in days how do you find the half-life of the substance to the nearest hour?
Monday, March 30, 2009 at 1:16am

Physics
what is the relationship between specific heat capacity and conduction? if an substance has a higher heat capacity is it a better heat conductor?
Thursday, March 26, 2009 at 10:41pm

body systems/terminology
Human blood, which has a pH of approximately 7.4, is a/an _______ substance. A. neutral C. basic B. acidic D. alkaline The body maintains a pH of 7.5, and human blood has a normal range between 7.35 to 7.45—almost neutral. Numbers below 7 are increasingly acidic, and ...
Wednesday, March 25, 2009 at 5:31pm

chemistry help
Determine the empirical formula for each substance. 1. A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O. 2. A compound is 38.77% Cl and 61.23 %O. 3. Magnetic iron oxide is 72.4 % iron and 27.6% oxygen.
Monday, March 23, 2009 at 7:59pm

Physics
Find the angle of refraction if there is one. If there isn't, tell which substance reflects the light: n=1.36 ~~~~~~~~~~~Angle=15.60 degrees n=1.73 ~~~~~~~~~~~Angle=17.94 degrees n=1.51 ~~~~~~~~~~~Angle=27.71 degrees n=1.0003 ~~~~~~~~~~~Angle=11.08 degrees n=2.42...
Sunday, March 22, 2009 at 5:37pm

chemistry
intermolecular forces Rank the following substance from highest melting point to lowest melting point. My teacher gave a list of compounds: H2O, NO2,F2,CI2 and to have a high melting point means that you need a stronger IMF. Rank the following substances from highest freezing ...
Tuesday, March 17, 2009 at 5:03pm

chemistry
um, i was wondering what the word is for a substance composed of two or more elements that are chemically combined to form a new substance with different properties. um, i kinda need the answer soon. thanx. :) Kenzie
Sunday, March 15, 2009 at 4:53pm

business
I need help with my peer review What is the main point of this essay? What is the greatest strength of this essay? Does the introduction grab your interest and make you want to read on? Explain your answer. What material does not seem to fit the main point of the essay or does...
Wednesday, March 11, 2009 at 11:30pm

business
I need help with peer review. I am not good at doing the reviews. Healthy Foods and Its Benefits It is commonly known that there are foods that improve health when eaten. It is almost equally known that there are also foods that can drastically affect the body negatively if ...
Wednesday, March 11, 2009 at 10:50pm

Chemistry
Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) An oxidizing agent is a substance that gains electrons in a redox chemical reaction. I think Al3+ has a very high electron ...
Tuesday, March 10, 2009 at 12:15pm

chemistry
In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– <--> NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains ...
Tuesday, March 10, 2009 at 12:03pm

Culinary Arts...HELP!!
Okay. sooo...i know that if you add flour to a substance it thickens up.But what can you add to a substance to thin it out (other than water...)
Monday, March 2, 2009 at 12:58pm

Identify the substance
There was a substance I used in a lab for chem class and I`m not too sure what it was. They were tiny white balls about a millimeter in diameter. What would they be?
Monday, March 2, 2009 at 1:29am

Chem
Is sugar an ionic, a molecular or a network convalent substance?
Sunday, March 1, 2009 at 10:59pm

Chem
There was this substance we used in a lab and I'm not quite sure what it is. It was a clearish, flaky, solid. It was brittle and insoluable in water. Does anyone know what it could be?
Sunday, March 1, 2009 at 10:57pm

Chemistry
Question: Consider following equilibrium system: SO2(g)+ Cl2(g) goes to So2Cl2(g) Kp=.900 atm @25 degree C. Suppose that 2.0 moles S02, 1.0 moles Cl2, and 3.0 moles So2Cl2 are placed in an empty 4.00L vessel at 25 degree C. Compute teh number of grams of each substance present...
Sunday, March 1, 2009 at 5:48pm

chemistry
Two solutions are prepared. In Solution A, 5.0 g of a substance of molecular weight 50 is dissolved in 100 mL of pure water. In Solution B, 5.0 g of a substance with molecular weight of 75 is dissolved in 100 mL of pure water. The solute is non volatile and non ionic. Which ...
Wednesday, February 25, 2009 at 8:42pm

Chemistry
I did an experiment to determine the freezing point depression and then find the molecular weight of the unknown solute added to the solvent, what would be the effect on calculating the molecular weight if some cyclohexane(my solvent) evaporated while the freezing point of the...
Wednesday, February 25, 2009 at 9:05am

Chemistry
Why is "pure orange juice" not a pure substance?
Tuesday, February 24, 2009 at 7:21pm

Chemistry
Suppose you mix 20kg of oxygen is used to burn 20kg of wood. Energy is given off as heat and light. If all the ashes and gases are collected , how would the mass compare with that of the orginal substance? Explain your answer. I have no clue what the answer is please help!!
Wednesday, February 18, 2009 at 9:44pm

chem
Does density of a substance change when the volume of the substance change? For example, if I had 10 mL of water and it has the density of 1g/mL will the density change if I had 20 mL of water instead?
Monday, February 16, 2009 at 8:46pm

Chemistry
When the solid and liquid phases are in equilibrium, which phase, solid or liquid, contains the most amount of energy (kenetic energy is the same)? Also, what is the difference between the melting and freezing of a substance?
Monday, February 16, 2009 at 8:25pm

chemistry... please help!
Pure glacial acetic acid HC2H3O2 has a freezing point of 16.62 degrees C. Its freezing point depression constant is Kf=3.57 Cm^-1. A solution was made by taking 9.755 g of an unknown non-electrolyte and dissolving it in 90.50 g of glacial acetic acid. The measured freezing ...
Friday, February 13, 2009 at 1:54pm

science
As redioactive material decays and the percentage of new material in the original sample increases, does the age of the sample substance increase, decrease, or remain the same?
Thursday, February 12, 2009 at 10:02pm

chemistry
can you check if I did the problems correctly? thanks! a soln of NaOH is prepared by dissolving 5.0g of NaOH in 500mL of water, the nadding additional water to make 1.0 L of soln. What is the pOH and pH of this soln? [OH-]=(5g/40g)mol/1L pOH=-log(1/8)=.90 [H3O+]=(1.0x10^-14)/(...
Thursday, February 12, 2009 at 5:31am

chemistry...DRBobb i have a questionnnn
We actually talked about this before just to remind you im posting the previous post below: ______________________________________________________ ____________________________________________________ And i have a different question regarding a post someone else ...
Sunday, February 8, 2009 at 8:13pm

science
what substance do you use to grow a virus in a lab
Saturday, February 7, 2009 at 12:40pm

Chemistry------DrBobb..
Lead metal is added to 0.140 Cr^3+(aq). Pb(s)+ 2Cr^3(aq)<---> Pb^2+(aq)+2Cr^2+(aq) KC=3.2*10^{-10} A. What is Pb^2+ when equilibrium is established in the reaction? B. What is Cr^2+ when equilibrium is established in the reaction? C. What is Cr^3+ when equilibrium is ...
Saturday, February 7, 2009 at 11:30am

chemistry, freezing point depression
Hey guys I did a lab and I have to answer the questions relating to the lab. I did question 1 & 2, can someone check if they are correct, and question 3 I don't know how to do it. 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2...
Friday, February 6, 2009 at 3:36pm

CHEM
Evaporation is an A.endothermic B.exothermic process, because when a substance evaporates it must A. absorb B. release energy to(from) its surroundings.
Sunday, February 1, 2009 at 4:42pm

chem
For substance A the emlting point is 16.61 degrees C and the specific heats of the solid and the liquid form are 2.662 and 5.188 JgC respectively. It requires 38600 joules to move 120g of A from 0 degrees C to 32.5 degrees C. This leads to the conclusion that the enthalpy of ...
Sunday, February 1, 2009 at 2:40pm

Chemistry
Substance A has a normal fusion point of -10 degrees C, an enthalpy of fusion = 150 Jg^-1; specific heats for the solid and the liquid are 3 and 6.2 Jg^-1C^-1 respectively. To change 150 grams of A from a solid at -40 degrees C to a liquid at 70 degrees C will require how many...
Sunday, February 1, 2009 at 1:49pm

Chemistry
--------Materials--------- several black pens of different types 2.0 mL water 2.0 mL rubbing alcohol 2 coffee filters small glass or paper cup --------Procedure-------- You may print this procedure out from Adobe if you wish: chrom.pdf Cut out a rectangular piece of filter ...
Sunday, February 1, 2009 at 11:02am

English
Nothing seems at first sight less important than the outward form of human actions, yet there is nothing upon which men set more store; they grow used to everything except to living in a so- ciety which has not their own manners. The influence of the social and political state...
Wednesday, January 28, 2009 at 10:29pm

science
How does a substance's density react to changes in temperature and pressure?
Tuesday, January 27, 2009 at 12:40pm

Dr Bob
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...
Monday, January 26, 2009 at 6:03pm

Biochemistry
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...
Sunday, January 25, 2009 at 8:47pm

Chemistry
Sometimes, instead of percentages compostion, you will have the composition of a sample by mass. Using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. A. a .858g sample of an unkown substance is composed of .537g ...
Saturday, January 24, 2009 at 7:00pm

chemistry
"a test liquid has a density of 1.1g/ml.. when u pour some of it into a cup of water what will happen asuming thar their nature are such that they dont mix and that their is no chemical reaction between the two substance? please help !!!
Wednesday, January 21, 2009 at 3:23pm

Organic Chemistry- help Dr. Bob
1. What is the maximum volume (at STP) of the butene mixture that could be obtained by the dehydration of 81 mg of 2-butanol? 2. When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed? Responses...
Wednesday, January 7, 2009 at 11:36pm

math
how many mL in .00670 grams of a substance that has a density of 1.96 g/cm3. do you do 1.96g/cm3 divided by .00670 grams to solve for cm3 since cm3 = mL
Wednesday, January 7, 2009 at 8:45pm

O CHEM - dr. bob
1. What is the maximum volume (at STP) of the butene mixture that could be obtained by the dehydration of 81 mg of 2-butanol? 2. When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed? Responses...
Wednesday, January 7, 2009 at 6:35pm

Criminal Procedures
Criminal Procedures Topic At 12:00 p.m., on August 16, 2005, Robert Smith began his journey to freedom down the halls of the prison he called home for the last 2 years. Despite receiving a 5-year sentence, Robert was paroled for good behavior. His lawyer had tried repeatedly ...
Wednesday, January 7, 2009 at 6:15pm

Organic Chemistry
When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?
Wednesday, January 7, 2009 at 1:58am

O Chem
1. What is the maximum volume (at STP) of the butene mixture that could be obtained by the dehydration of 81 mg of 2-butanol? 2. When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?
Monday, January 5, 2009 at 8:38pm

Science
A polar substance is most soluble in ... ? A non-polar substance is most soluble in ... ? A generalized statement summarizing the effect of bond polarity on the solbility of a substance in a solvent is ... ?
Monday, January 5, 2009 at 6:07pm

chem
a certain substance strongly absorbs infrared light having a wavelength of 3.75µm. what is the frequency of this light in hertz? i know that i have to use the equation c = frequency x wavelength and that c = 2.998 x 10^8 m/s. how do i convert that to µm/s? I think ...
Friday, January 2, 2009 at 8:45pm

Science
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...
Thursday, December 25, 2008 at 12:42am

Science [Chemistry]
Excusme: Can somone tell me what are alkalis and acids. I am doing a homework about acids and alkalis [level 3 to 6]. About level 3 is name some alkalis and aids and some everyday substance that contains acids. Level 4 is about know some acids and alkalis which are more ...
Saturday, December 20, 2008 at 5:55am

chemistry grade 11
i have a question about finding the concentration of a substance then changing it to a percent. i check over my notes and i can't find it. the concentration of an unkown substance is 0.831 M and the two given substances are 4% and 5.5% so i do not know howto calculate ...
Monday, December 15, 2008 at 10:18pm

wh
how did the abbasid caliphate differ in style and substance from the umayyad calipate?
Monday, December 15, 2008 at 9:16pm

11th grade CHEMISTRY TITRATION LAB!
i have a tritation lab due tomorrow and i am stumped on a couple things. its a titration lab using sodium hydroxide (NaOH)- 250 mL 0.300 M concentration, 10 mL of an unknown substance of vinegar, the avg. of titrated NaOH in the flask with vinegar is 27.7 mL firstly its a ...
Sunday, December 14, 2008 at 8:56pm

advanced functions HELP!!!
Radioactive decay is the process by which an unstable element transforms into different element, typically releasing energy as it does so. For 500g of a radioactive substance with a half-life of 5.2 hours, the amount remaining is given by the formula M(t)=500(0.5) ^ t/5.2 a) ...
Wednesday, December 10, 2008 at 8:55pm

ancient egypt
What substance was used to stuff the nostrils?
Wednesday, December 10, 2008 at 8:55pm

college psych
Which of the following is true of the prevalance rate of psychological disorders in the United States? a) Men experience mood disorders at a higher rate than women b) Women and men differ substanrially on disorders such as schizophrenia c) Men and women experience about the ...
Wednesday, December 10, 2008 at 3:46pm

college psych
Which of the following categories of disorders is most prevalent in the United States? a) Mood Disorders b) Psychotic Disorders c) Substance Abuse/ dependence disorders d) Dissociative Disorders e) Anxiety Disorders I believe the answer is E
Wednesday, December 10, 2008 at 3:39pm

CHemistry
I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals, they formed a ...
Tuesday, December 9, 2008 at 5:00pm

Chemistry
I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals, they formed a ...
Tuesday, December 9, 2008 at 3:54pm

chemistry
I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals, they formed a ...
Tuesday, December 9, 2008 at 2:20pm

lab chemistry
I did a project for lab chemistry where my aim was to see which substance, from a selection of 4 chlorides, recrystallises from a solution to form the most crystals. The 4 chlorides were KCl, NaCl, MgCl2 and CaCl2. KCl and NaCl didn't form any crystals, they formed a ...
Tuesday, December 9, 2008 at 12:50pm

Chemistry
How many representative particles are in a mole of any substance?
Monday, December 8, 2008 at 11:31pm

chemistry
Upon complete combustion, the indicated substances eveolve the given quantities of heat. Write a balanced equation for the combustion of 1.00 mol of each substance, including the enthalpy change, ÄH, for the reaction. a) 0.548g of propane, C3H8(g), yields 29.4 J b) 2.35 ...
Monday, December 8, 2008 at 11:25pm

chemistry
Three substance absorbe light in the un/visible region. In determining the concentration of these three substances which are present in the same solution using spectrophotometry (without prior separation) what condition must apply?
Monday, December 8, 2008 at 11:02pm

College Algebra
The hydrogen ion concentration of a substance is related to its acidity and basicity. Because hydrogen ion concentrations vary over a very wide range, logarithms are used to create a compressed pH scale, which is defined by pH=-log(H+)where (H+)is the hydrogen ion ...
Monday, December 8, 2008 at 1:54am

physical science
Describe how Avogadro’s constant relates to a mole of a substance.
Thursday, December 4, 2008 at 8:42pm

Chem- Dr bob! or GK!
Calculate the energy that must be removed to convert substance X from a gas at 116°C to a solid -44.6°C. Assume X has a molar mass of 75.0 g/mol. ÄHvap 20. kJ/mol C(s) 3.0 J/g·°C ÄHfus 5.0 kJ/mol C(l) 2.5 J/g·°C bp 75°C C(g) 1.0 J/g&...
Saturday, November 29, 2008 at 11:04pm

Physics
One application of the index of refraction is analysis of crime scenes. Using the index of refraction, forensic scientists can determine what type of glass has been left at a scene. Read the following and answer the questions below. Different types of glass (bottle, window, ...
Monday, November 24, 2008 at 7:41pm

Science
What are the differences between these things? 1. substance vs. mixture 2. homogeneous vs. heterogeneous 3. solute vs. solvent 4. saturated vs. supersaturated 5. concentrated vs. dilute 6. element vs. compound 7. aqueous solution vs. universal solvent 8. soluble vs. insoluable
Thursday, November 20, 2008 at 10:53am

science
Substance shaped in a cube of length 2 cm. The cube's mass is 24 g. What is the density of this substance?
Tuesday, November 18, 2008 at 5:08pm

science
what is the role of the cell membrane in moving substance in and out of the cell? Thank u!!!
Monday, November 17, 2008 at 6:47pm

chemistry
Find the false statement(s) about the thermochemistry experiment in which nitric acid is reacted with sodium hydroxide, and the enthalpy of the reaction is measured using an ice calorimeter. i. Regardless of which strong acid and strong base are used for the neutralization ...
Sunday, November 16, 2008 at 3:48am

Chemistry
What is the effect on the boiling point of a solution (for example, water) produced by a soluble nonvolatile substance (for example, sodium chloride)? What is the effect of an insoluble substance such as sand or charcoal? I believe if an insoluble substance is added, then the ...
Monday, November 10, 2008 at 8:21pm

Health Information
What is the best answer to this question. I have read, and read many times and can't figure it out. Please help! Judge Jones is hearing a motion to order release of substance abuse records pursuant to a subpoena. The hearing: A. must be in open court because the records ...
Monday, November 10, 2008 at 7:50pm

chemistry
Laws passed in some states define a drunk driver as one who drives with a blood alcohol level of 0.08% by mass or higher. the level of alocohol can be determinded byt titrating blood plasma with pottasium dichromate according to the unbalanced redox reaction. igot the balanced...
Thursday, November 6, 2008 at 9:36pm

Algebra
I have a few things I need some help with. Does anyone know how many cubic decimeters are in 1 liter? And would anyone be able to help me with this problem? The density of a substance is 2.7 g/cm³. What is the density of the substance in kilograms per liter? Thank you so ...
Wednesday, November 5, 2008 at 7:03pm

Chemistry
How do you determine what ionic substance has more exothermic lattice energy? for example if you compare NaCl and KCl???
Tuesday, November 4, 2008 at 5:27pm

chemistry
For the following reaction in aqueous solution: HNO2(aq) + NO3-(aq) HNO3(aq) + NO2-(aq) The net reaction will proceed from: a. ) left to right b. ) right to left c. ) the reaction will not occur would the answer be c) because each side of the the equations has one weak ...
Sunday, November 2, 2008 at 12:09pm

Social Studies: EGYPT
what was the substance that was used to stuff the nostrils during the mummification process
Monday, October 27, 2008 at 9:26pm

Chemestry I
Sorbitol is a sweet substance found in fruits and berries and someties used as a sugar substiture. An aqueous solution containin 1g of sorbitol in 100g water has a freezing point of 0.102C. Elemental analysis indicates that sorbitol is 39.56%C, 7.75%H, and 52.7O. What are the ...
Sunday, October 26, 2008 at 7:19pm

General Chemestry
Diacetyl, a substance contributing to characteristic flavor and aroma of butter, consist of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 C and 747 torr, a 0.30 gram sample occupies a volume of 111ml. What is the molacular formula of diacetyl?
Sunday, October 26, 2008 at 6:31pm

Science
If a substance undergoes a chemical change, could its volume change?
Sunday, October 19, 2008 at 6:19am

Science
Calculate the density of bromine if 586g of the substance occupies 188mL
Thursday, October 16, 2008 at 8:17pm

Biology(Anatomy&Physiology)
1)Which group of organic molecules makes up your genetic code 2)A substance which tends to resist a change in the pH of a solution is called a 3)Which buffers is the most common in the body 4)Which of molecules is primarily made of CHON 5)Which is the building block or monomer...
Wednesday, October 15, 2008 at 8:30pm

science
The force of attraction between two objects________decreases or increases if you increase the amount of mass or substance in the bodies. The force of attraction between two objexts___decreases or increases if you increase the distance between them?
Monday, October 13, 2008 at 4:15pm

Physics
A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time is defined as the time in which A(t) falls from 90% to 10% of its initial value. ...
Saturday, October 11, 2008 at 10:12am

chem
A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g of X(a substance with a molar mass of 46.0g/mol) is added, it dissolves via the reaction X(s)+H20(l)->X(aq) and the temperature of the solution increases to 25.0degrees celsius. Calculate the enthalpy...
Wednesday, October 8, 2008 at 5:29pm

chem
Calculate the standard enthalpy change for the reaction 2A+B->2C+D Use the following data: Substance A=-257kj/mol B=-413kj/mol C=189kj/mol D=-475kj/mol For the reaction given , how much heat is absorbed when 3.00mol of A react?
Wednesday, October 8, 2008 at 4:29pm

mummification process
What substance was used to stuff the nostrils
Tuesday, October 7, 2008 at 9:19pm

Medical Language
Could someone please help me with this I have been working at this for a few hours now. A. Use the word bank below to build the medical word that corresponds to each definition in problems 1-16. Word parts may be used more than once. Click the grey box to begin typing. gloss/o...
Tuesday, October 7, 2008 at 12:28pm

stoichiometry
A confiscated white substance, suspected of being cocaine, was purified by a forensic chemist and subjected to elemental analysis. Combustion of a 50.86-mg sample yielded 150.0 mg CO2 and 46.05 mg H2O. Analysis for nitrogen showed that the compound contained 9.39% N by mass. ...
Saturday, October 4, 2008 at 11:00am

Calorimetry
A calorimeter contains 21.0 mL of water at 12.0 degress Celsius. When 2.40g of X (a substance with a molar mass of 50.0 g/mol ) is added, it dissolves via the reaction X(s)+H2O(l) --> X (aq) and the temperature of the solution increases to 29.5 degress celsius. Calculate ...
Tuesday, September 23, 2008 at 1:53am

health
The purpose of environmental epidemiology studies is to prove that an environmental agent is the cause of a particular adverse effect. True False 2. Which of the following is not an accurate statement about dose-response? The NOAEL is the highest data point on the dose-...
Monday, September 22, 2008 at 8:28pm

science
Which of these is a pure substance? grape juice, salt water, table salt or gasoline?
Monday, September 15, 2008 at 9:42pm

CIVICS
i DONT UNSERSTAND THiS CAN S0M30N3 3XPLAiN TO ME WHAT ITS SAYING.. Obama mocks McCain's promise to bring change By TERENCE HUNT – 1 hour ago GRAND JUNCTION, Colo. (AP) — Barack Obama on Monday mocked John McCain's promise to bring change to Washington, saying...
Monday, September 15, 2008 at 5:09pm

chemistry
Whatis the chemical name of the substance formed in the slow reaction that takes place when iron filings are mixed with water?
Saturday, September 13, 2008 at 7:28pm

Chemistry + possible answers
for question 2c earlier - Would you describe the effect of heat on the white powders as a physical change or a chemical change? give one reason for your answer. - My sister told me the answer would be for whichever one is more difficult to reverse but I don't know which ...
Thursday, September 11, 2008 at 2:46pm

9th grade Social
What modern tools do these early tools resemble? 1.> Small sharp tipped tool which is made of bone. 2.> Roughly the size of arrowhead, the 1.5 inch tip of this hand held tool is made of flint, a very hard rock. the wooden handle is about three inches long. 3.> X-rays ...
Sunday, September 7, 2008 at 4:36pm

mummification
What is the substance that is used to stuff the nostil in Egypt????????
Friday, September 5, 2008 at 7:56pm

science
a substance that keeps its shape because its particles can't flow freely is a(n).........
Thursday, August 28, 2008 at 6:29pm

organic chemistry
a compound you have prepared is reported in the literature to have a pale yellow color. when the substance is dissolved in hot solvent to purify by crystallization, the resulting solution is yellow. explain if you should us decolorizing charcoal before allowing the solution to...
Monday, August 25, 2008 at 3:13am

Science
What is a mixture in which one substance spreads evenly throughout another substance
Monday, August 18, 2008 at 9:41pm

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