Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

12th grade
Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the element have very different melting temperatures and densities. The unknown substance is most likely a what?
Friday, November 19, 2010 at 1:30pm

Science
What is a simple experiment to determine if a solid white substance is a protein or a carbohydrate
Thursday, November 18, 2010 at 7:42pm

Chemistry
What is the balanced molecular equation and their physical state of each substance of silver(I) nitrate and 6 M hydrochloric acid?
Wednesday, November 17, 2010 at 5:47am

chemistry
What is the balanced molecular equation and their physical state of each substance of barium chloride and 3 M sulfuric acid?
Wednesday, November 17, 2010 at 5:46am

chemistry
what is the balanced molecular equation and their physical state of each substance for: copper(II) sulfate and 10% sodium hydroxide?
Wednesday, November 17, 2010 at 5:45am

chemistry
if you mixed 7 grams of iodine pentafloride with 2 grams of water which substance would be the limiting reactant?
Tuesday, November 16, 2010 at 1:09am

chemistry
we add 100 ml of water at 20 degrees celcius to 10g of an unknown substance which is at 50 degrees celcius. The water ends up at 25 degrees celcius. how much heat was transfered?
Monday, November 15, 2010 at 8:35am

Physical Science
Object A has a mass of 500g and a density of 5.0g/cm^3; object B had a mass of 650g and a density of 5.6g/cm^3. a. Which object will displace the most liquid? b. Could object A and object B be made of the same substance?
Saturday, November 13, 2010 at 6:57pm

Calculus
fter a foreign substance is introduced into the blood, the rate at which antibodies are made is modeled by f(t) = 27 t/8 t^2 + 3 where f(t) is in thousands of antibodies per minute, and t is measured in minutes with 0 ≤ t ≤ 60. Assuming that there are no antibodies...
Friday, November 12, 2010 at 10:51pm

substance
Whut is an eleven letter word starting with e that means process which alcohol leaves the body, this is for a crossword puzzle?
Thursday, November 11, 2010 at 7:36pm

Physics HELP HELP
(for some reason I keep getting this wrong. I put 90 for c, 5.6 for h and 22 for M(x), Then I took the natural log of both sides, but I keep getting it wrong) The mass of a radioactive element at time x is given by the equation below, where c is the original mass and h is the ...
Wednesday, November 10, 2010 at 5:54pm

English
heres another the last part. Classify as Simple, compound, complex or compound complex. complex-13) The burden of proof should be reversed; that is, no one should be allowed to release any substance into the air until it is proved harmless. compound-14) This principle is used ...
Tuesday, November 9, 2010 at 3:50pm

Chemistry 110
Write the formulas of the principal molecular or ionic species present in an aqueous solution of each substance. (a) Sodium Chloride, NaCl (b) Hydrogen bromide, HBr (c) Iron (III) sulfate, Fe2(SO4)3 (d) Ethanol, CH3CH2OH (e) Glucose, C6H12O6 (f) Ammonium acetate, NH4CH3COO
Tuesday, November 9, 2010 at 2:14pm

Chemistry
1. Write the formulas of the principal molecular or ionic species present in an aqueous solution of each substance. (a) Sodium Chloride, NaCl Na+ + Cl- (b) Hydrogen bromide, HBr (c) Iron (III) sulfate, Fe2(SO4)3 (d) Ethanol, CH3CH2OH (e) Glucose, C6H12O6 (f) Ammonium acetate, ...
Tuesday, November 9, 2010 at 1:46pm

chemistry
Would you expect the boiling point of a solution to change if you added a non-volatile solute such as potassium chloride? How? Would an insoluble substance such as sand affect the boiling point? EXPLAIN PLEASEE :] thanks so much!!
Sunday, November 7, 2010 at 10:56pm

chemistry
There is a maximum numerical value for the refractive index of a liquid substance. What is this value and why is it the maximum (HINT: take a look at the mathematical formula!)
Sunday, November 7, 2010 at 10:56pm

Chem. thankss!!!
1.0 mol of water (c=4.184 J/g.oC), 1.0 mol of ethanol (c=2.46 J/g.oC), 1.0 mol of carbon tetrachloride (c=0.861 J/g.oC), and 1.0 mol of ethylene glycol (c=2.42 J/g.oC) at 50oC were each placed into a separate coffee cup calorimeter and the temperature recorded. The temperature...
Friday, November 5, 2010 at 8:50pm

Science
Does my hypothesis match with my intro? I'm writing a lab report. Introduction: The intention of this lab is to find the pH of different household material. Boiled red cabbage juice will be used as the pH indicator. pH is the chemical potential of hydrogen and the scale of...
Thursday, November 4, 2010 at 1:01pm

science
What do you call a substance that is not a liquid but you can change it's form into whatever you want? Is it a solid? Thanks, Bell
Wednesday, November 3, 2010 at 6:44pm

chemistry
If the temperatures of separate 34 g samples of gold, mercury, and carbon are to be raised by 10.0°C. How much heat must be applied to each substance?
Tuesday, November 2, 2010 at 8:54pm

Chem.
Acetic acid (CH3COOH) reacts with isopentyl alcohol (C5H12O) to form isopentyl acetate (C7H14O2), a fragrant substance with the odor of bananas. CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of ...
Sunday, October 31, 2010 at 9:07pm

Chem
Acetic acid (CH3COOH) reacts with isopentyl alcohol (C5H12O) to form isopentyl acetate (C7H14O2), a fragrant substance with the odor of bananas. CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of ...
Sunday, October 31, 2010 at 2:50pm

Chemistry
35. In a calorimeter, the energy content of a substance is calculated from a measure of the temperature change in a known mass of a. iron b. air c. water d. steel C? 36. A decrease in the reactant concentration, per unit time, in a reaction is a measure of the a. heterogenous ...
Friday, October 29, 2010 at 3:21pm

Chemistry
6. Heat of combustion is the heat released by the complete combustion of one mole of a substance.- T? 8. In nature, processes tend to occur that lead to a higher energy state.- F 9. Concentration does not have an effect on a reaction.- F Thanks! -MC
Friday, October 29, 2010 at 1:22pm

health
A notice of use & and & disclosure is required for A. Every patient a doctor treats. B. New patients,but not established patients. C. patients whose personal health information the doctor intends to disclose. D. Patients treated for sensitive conditions, such as substance ...
Friday, October 29, 2010 at 1:24am

health
If an instructional review board is involved in a request for information, the information is likely sought by a A. Health care facility. B.Researcher. C. Court. D. Substance abuse center.
Friday, October 29, 2010 at 1:16am

Chemistry
6. Heat of combustion is the heat released by the complete combustion of one mole of a substance.- T? 7. Catalysts are not consumed during a reaction.- F 8. In nature, processes tend to occur that lead to a higher energy state.- F 9. Concentration does not have an effect on a ...
Thursday, October 28, 2010 at 9:14pm

physical sience
Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the element have very different melting temperatures and densities. The unknown substance is most likely a
Thursday, October 28, 2010 at 1:16pm

College Critical Reading
If someone could please let me know if these multiple choice questions are right? I believe they are but I want to make sure! Thanks for the help in advance! 1. Critical readers watch television by deciding that their primary purpose for choosing shows is based on? a.) which ...
Tuesday, October 26, 2010 at 10:44am

Chemistry
A student named KClO3 potassium chlorine (V) oxide. Explain why the use of the stock system is not correct in this case and write the correct name of the substance.
Monday, October 25, 2010 at 10:40pm

Adv. Chem
I need some help with a Chemistry crossword. The subject is transition metals and we weren't told what chapter this was in the book. Down: 30. Cinder-like particles of pellets of concentrated ore Across: 5. Term referring to substances that are attracted into a magnetic ...
Monday, October 25, 2010 at 9:35pm

Chemistry
3. A hypothesis is a testable statement.- T 4. Weight is a measure of the quantity of matter.- F 6. Potential energy is energy of motion.- F? 7. Liquids do not have a definite shape or volume.- F 8. The ability to burn is a chemical property.- T 10. Solutions are heterogeneous...
Monday, October 25, 2010 at 4:45pm

social studies
What was the substance usd to stuff the nostrils?
Monday, October 25, 2010 at 11:14am

chemistry
Determine the ratio of cations to anions for the following ionic compounds a. potassium, a salt substance b. calcium floride, used in steel industry c. aluminum oxide, known as corundum in the crystalline form d. calcium oxide, used to remove sulfur dioxide from power plant ...
Sunday, October 24, 2010 at 10:54am

Chemistry
A calorimeter contains 21.0 mL of water at 14.0 degreesC. When 1.90 g of X (a substance with a molar mass of 70.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)reacts to make X(aq) and the temperature of the solution increases to 28.5degreesC. Calculate the ...
Friday, October 22, 2010 at 12:04pm

College Chemisty
Given following reduction potentials in solution. Which is weakest oxidising agent in the list. List of numbers on right is for Eo/V. Al3+(aq)+3e- = Al(s) -1.66 Sn4+(aq)+2e- = Sn2+(aq) +0.14 Is(s)+2e-=21-(aq) +0.53 Why is a certain substance weakest? Is it -1.66 because this ...
Wednesday, October 20, 2010 at 10:51pm

Chemistry
I need someone to check these True or False questions for me please: 3. Dissolving salt in water is a physical change- F 14. Burning newspaper is a physical change- F 19. The liter is a measure of volume- T 20. The amount of heat and temperature of a substance are the same- F ...
Tuesday, October 19, 2010 at 12:18pm

Chemistry
Substance A has a melting point of -10 degree celcius and a boiling point of 57 degree celcius. Sunstance B has a melting point of -67 degree celius and a boiling point of 15 degree celius. Room temperature is 20 degree celcius. (A) What is the physical state of substance A at...
Monday, October 18, 2010 at 11:46am

Chemistry
You receive two samples of a substance. After testing, it shows that one sample contains 88% oxygen by mass an 12% hydrogen. The second sample contains 94% oxygen and 6% hydrogen. Is it possible that the two samples are the same? Explain. thanks, I appreciate the help !
Sunday, October 17, 2010 at 10:48pm

Chemistry
Posted by ann on Sunday, October 17, 2010 at 4:26am. In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has previously been melted in a melting point tube?)
Sunday, October 17, 2010 at 5:28pm

Chemistry
In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has previously been melted in a melting point tube?)
Sunday, October 17, 2010 at 4:26am

Say NO! to Drugs
2.What's one thing your school or community could do to help prevent substance abuse in your area? What is this question exactly asking? This is what I have put: One thing that my school or community could do to help prevent substance abuse in my area is that they can make...
Wednesday, October 13, 2010 at 8:06pm

Chem2
Copper(II) iodate precipitates from iodate solution. The formula of the precipitate is CU(IO3)2. A saturated solution of this substance was made in 0.01 M KLO3. The copper concentration was found to be 0.0013 M. Determine the [IO3-] and Ksp of the substance.
Tuesday, October 12, 2010 at 9:05pm

IPC
which one of these is true? Which of the following statements is true? 1) The freezing and boiling temperatures of a substance are the same. 2) The freezing and condensation temperatures of a substance are the same. 3) The freezing and melting temperatures of a substance are ...
Tuesday, October 12, 2010 at 11:36am

chemistry
what is the mass in kilograms of 750 mL of a substance that has a density of 0.930 g/mL?
Monday, October 11, 2010 at 11:01pm

science
why can a scientist use boiling point or melting point to identify an unknow substance?
Monday, October 11, 2010 at 5:40pm

AP Chem
A student chemist named Hannah Montana set up an electrical conductivity tester similar to that shown on page 141 and conducted an experiment involving two clear, colorless liquids, identified as solution A and solution B. Solution A and Solution B are both 0.050 M. The ...
Monday, October 11, 2010 at 12:38pm

earth space science
A substance that cannot be broken down into simpler substances by physical or chemical needs is called an
Monday, October 11, 2010 at 11:26am

Communication
Résumés must be free from typos because employers: A will not hire anyone who cannot type. B assume that someone who is careless with a résumé would be careless on the job. C believe that typos are evidence of alcohol or substance abuse. D will ...
Sunday, October 10, 2010 at 10:24pm

physics
What is the density of an unknown spherical substance with mass of 30 g and radius of 0.35 inches in kg/m3? (density= mass/ volume)
Saturday, October 9, 2010 at 9:24pm

CHEM- FP
camphor melts at 179.8 degrees, and it has a particularly high freezing point depression constant.(kf=40 degrees/m). when 0.186g of an organic substance of an unknown molar mass is dissolved in 22.01g of liquid camphor, the freezing point of the mixture is found to be 176.7 ...
Friday, October 8, 2010 at 10:41pm

science
What is a type of substance that does not dissolve? Thank you
Thursday, October 7, 2010 at 9:20am

science
Is a type of substance that dissolves a --solvent Also, if it is not crystalline--what is it?
Thursday, October 7, 2010 at 8:45am

chemistry
HBr is a molecular substance that is a strong acid in water. Write an equation for its ionization in water. Use minimal integer numbers to balance the reaction. Include physical states in your answer, e.g., start with HBr(l).
Monday, October 4, 2010 at 8:54pm

Chemistry
H2O (l) requires the largest amount of energy to raise the temperature of 25.0g H2O of the substance from 15.0 *C to 37.0 *C. Calculate the energy. Hg (l) has the largest temperature change when 550 g of the substance absorbs 10.7kJ of energy. Calculate the temperature change...
Sunday, October 3, 2010 at 11:58pm

chemistry
im stuck on finding the molarity of a substance and its due tomarrow. someone please help. 5 moles of HCI in two liters. 2 moles of NaOH in 1 liter. 0.5 moles of HCI in one liter. 36 grams of HCI in one liter. thanx, alex
Sunday, October 3, 2010 at 8:27pm

Chemistry
Why was the term "organic" originally chosen? Give an example of an original organic substance. My answer: The term organic was originally chosen because early chemists believed that certain chemicals were only found in living organisms. These chemicals were called ...
Saturday, October 2, 2010 at 6:37pm

Physical chemistry
Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about .50 mol/dm^3. I'm pretty sure the formula to use is pj=xjpj'. Where pj' is...
Thursday, September 30, 2010 at 8:27pm

9th grade
An uknown substance from planet x has a density of 10g/ml.it occupies a volume of 80ml. what is the mass of this unknown substance
Monday, September 27, 2010 at 5:00pm

9th grade
An uknown substance from planet x has a density of 10g/ml.it occupies a volume of 80ml. what is the mass of this unknown substance
Monday, September 27, 2010 at 4:45pm

chemistry
What is the empirical formula of a substance that contains 8.33×10−2 mol of carbon, 0.167 mol of hydrogen, and 8.32×10−2 mol of oxygen?
Sunday, September 26, 2010 at 7:06pm

C hemistry
An unknown compound contains only carbon, hydrogen, and oxygen . Combustion of 2.50 g of this compound produced 3.67 g of carbon dioxide and 1.50 g of water. What is the empirical formula of a substance that contains 8.33×10−2 mol of carbon, 0.167 mol of hydrogen, ...
Sunday, September 26, 2010 at 5:56pm

Science
What is the term that means "not able to be dissolved in a particular substance?"
Sunday, September 26, 2010 at 3:15pm

Science
Is rubbing alcohol a pure substance or a mixture?
Sunday, September 26, 2010 at 3:09pm

Science
Is baking soda a pure substance or a mixture?
Saturday, September 25, 2010 at 3:45pm

chemistry
Substances A and B with the same mass and the same initial temperature absorb the same amount of heat energy. The final temperature of A is higher than the final temperature of B. Which substance would have the higher specific heat? Why?
Friday, September 24, 2010 at 7:39pm

chemistry
what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm3? what volume would be occupied by 7.75g of this same substance? PLEASE help need the answer tonight i have a test tomorrow i kind of not understand the second question. THANK YOU SO ...
Wednesday, September 22, 2010 at 6:02pm

science
we have done experiment in school and for homework we must write chemical reactions that have happend during the experiment. the experiment was like this : first we took an unknown substance than we have put some CuO , we mixed that two substances together in test tube. Than ...
Wednesday, September 22, 2010 at 12:57pm

Second order half life
At 100 degrees C , a certain substance undergoes second-order decomposition with a half-life of 26 minutes. If the initial concentration of the substance is 3.9×10−2M , what is the value of the rate constant at 100degrees C? So I put in (1560seconds) 1/2 = 1/ k (3....
Tuesday, September 21, 2010 at 6:46pm

chemistry
An unknown substance has a mass of 17.3 . When the substance absorbs 1.557×102 of heat, the temperature of the substance is raised from 25.0 to 45.0 . What is the most likely identity of the substance?
Monday, September 20, 2010 at 10:47pm

chem
what substance is oxidized in following reaction 4 HCl+MnO2 and Cl2+2H2O+MnCl2
Monday, September 20, 2010 at 6:09pm

Chemistry
Can some explain how I can determine if a substance has ion-dipole, dipole-dipole, ion-ion or london dispersion forces? I'm really confused and have a test soon please help!
Monday, September 20, 2010 at 3:19pm

chem h/w
i did a lab and i need to find out the melting point for lauric acid and lauric acid with another substance. the teacher told us to figure it out using excel. this is my graph. tinypic. com/view.php?pic=1605yev&s=7 can someone help me in figuring out the two melting points?
Saturday, September 18, 2010 at 7:33pm

calculus
assume the half-life of the substance is 31 days and the initial amount is 183.9 grams. (a) Fill in the right hand side of the following equation which expresses the amount A of the substance as a function of time t (the coefficient of t in the exponent should have at least ...
Thursday, September 16, 2010 at 4:40pm

Chemistry, Solutions
Two or more combined substances that do not react form a _________. solution mixture substance compound
Thursday, September 16, 2010 at 12:00pm

physics
if u measured all the energy related to motion, and all the stored energy in the particles of a substance, you would be measuring?
Wednesday, September 15, 2010 at 2:39pm

calculus
Assume a substance has a half-life of 11 years and the initial amount is 144 grams. How much remains at the end of 5 years? How long will it be until only 30 % remains?
Tuesday, September 14, 2010 at 7:05pm

Science
What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
Friday, September 10, 2010 at 11:21am

Chemistry
What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H? This is what I did... Find how many moles of each... .00766 mol C .01786 mol H Then I think I am supposed to divide each by the lowest number.. But I am not coming out with anything close to a ...
Tuesday, September 7, 2010 at 8:10pm

Chemistry
What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H?
Tuesday, September 7, 2010 at 5:52pm

CHEMISTRY> HELP QUICK! pls
Use the following thermodynamic data at 298 K to determine the equilibrium constant at this temperature for the reaction of iron in steam to form hydrogen and iron(III) oxide. 2Fe(s) + 3H2O(g) 3H2(g) + Fe2O3(s) Substance Fe(s) H2O(g) H2(g) Fe2O3(s) ÄH°f (kJ/mol) 0 -...
Sunday, September 5, 2010 at 2:58am

CHEMISTRY> HELP QUICK! pls
Use the given data at 298 K to calculate ¦¤G¡ã for the reaction 2NO(g) + 2H2(g) ¡ú N2(g) + 2H2O(g) Substance NO(g) H2(g) N2(g) H2O(g) ¦¤H¡ãf (kJ/mol) 90 0 0 -242 S¡ã(J/K¡¤mol) 211 131...
Saturday, September 4, 2010 at 11:05pm

quick chemistry
A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. What is solid B most likely to be? a)...
Saturday, September 4, 2010 at 4:13pm

chemistry
Is diamond a pure substance, a homogeneous mixture or a heterogeneous mixture????
Saturday, September 4, 2010 at 12:22pm

Allied Health
Of the following types of information, which one has the stictest rules regarding the release of information? A. substance abuse info. B. Mental illness info. C. Genetic info. D. Adoption info.
Monday, August 30, 2010 at 9:39pm

Chemistry
A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we ...
Sunday, August 29, 2010 at 8:06pm

science
the absorption of heat by any substance is dependant upon
Thursday, August 26, 2010 at 3:54pm

science
The chemical substance found in the atmosphere exists as a / an______. a) mixture b) radical c) element d) compund e) solid I PICKED D
Wednesday, August 25, 2010 at 3:30pm

science
The chemical substance found in the atmosphere exists as a / an______.
Wednesday, August 25, 2010 at 12:14pm

Chemistry
Suppose you are given a sample of a homogeneous liquid. What would you do to determine whether it is a solution or a pure substance?
Sunday, August 15, 2010 at 8:25pm

Maths
Please help!!! The mass of a particular substance is known to grow exponentially at a rate of 1.5% per day. Its initial mass was 230 grams and, after t days, it weighed 325 grams. The equation modelling this growth is 230×1.015 t =  ...
Saturday, August 14, 2010 at 6:57am

Chemistry
First two hw of 50 that I am trying to get a handle on. Any help would be appreciated. 3.What gaseous substance is driven off of succrose when it is heated? is the answer CO2? 7.What gaseous substance is driven off of succrose when it is reacted with acid? 17. What is the back...
Sunday, August 8, 2010 at 7:50pm

chem
Suppose you are given a sample of a homogeneous liquid, consisting of a non-volatile solute and a suitable solvent. What would you do to determine whether it is a solution, colloid, suspension or a pure substance? Cite reasons for your answer..
Sunday, August 8, 2010 at 7:39am

substance
a page of a textbook is 7 1/2 wide. the pages are divided into three equal columns with 3/8 in between how wide is each column
Saturday, July 31, 2010 at 12:03am

Science
Please help me with my homework! OK, so there is this girl conducting an experiment to see whether a solution (juice) will take longer to freeze than a substance )pure water).She predicts that water will take less to freeze. So there is this article that goes on and on to list...
Sunday, July 25, 2010 at 6:26pm

Chemistry
1. The delta Hf of an element in its standard state is defined to be a) 0 kJ/mol b) 10 kJ/mol c) -10 kJ/mol d) greater than 0 kJ/mol e) a unique value for each element I am assuming its a? 2. Which of the following statements are true? I) The reaction vessel cools when an ...
Wednesday, July 21, 2010 at 10:01pm

Chemistry
1.What is the molar heat of vaporization of water, given the following thermochemical equations? H2 + 1/2 O2 --> H2O + 241.8 kJ H2 + 1/2 O2 --> H2O + 285.5 kJ a) 44.0 kJ/mol b)-44.0 kJ/mol c)241.8 kJ/mol 2. Which substance has a standard enthalpy of formation delta Hf, ...
Wednesday, July 21, 2010 at 5:58pm

Phyics
A Carnot engine has 200 g of helium as its working substance and operates between two reservoirs which are at temperatures of 500C and 30C. The initial volume of the gas is 20 litres while the volume after isothermal expansion is 60 litres. For one ...
Wednesday, July 21, 2010 at 3:37pm

Literature HELP!!!
Which phrase best describes Samuel Pepys's personality, judging from the Diary excerpts you read? A.a caring, social man with many friends B. a hardworking but miserly man who cares only about the damage the fire will cause his properties C.an angry and depressed man who ...
Wednesday, July 14, 2010 at 6:38pm

Chemisrty
If you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1, what number or numbers could you change in order to balance the equation?
Wednesday, June 30, 2010 at 8:56pm

chemistry
what mass in grams of a molecular substance (mole weight=50.0g/mol) must be added to 500g of water to produce a solution that boils at 101.56(degrees)C?
Saturday, June 26, 2010 at 9:52pm

Chemistry
What occurs in the process of ionization? A. Acids dissociate to produce hydroxide ions, as their only negative ions. B. Strong bases ionize almost completely yielding a maximum quantity of hydrogen ions. C. Stationary solid ions are produced. D. Ions are formed by a dissolved...
Thursday, June 24, 2010 at 8:57pm

chemistry
A substance has a heat of fusion of 61.5 kj/mol and a heat of deposition of 167.4 kj/mol. What is 175 heat of sublimation in kj/mol? A) 61.5-167.4 B) 61.5+ 167.4 C) -61.5 D) 167.4 E) 167.4-61.5
Monday, June 21, 2010 at 2:26pm

Law
Joe Researcher asks for access to patient records as part of a research project. What should the health information manager do? A. Say yes—access for research is permitted. B. Say no. C. Tell Joe to submit his request to an institutional review board if he doesn’t ...
Monday, June 21, 2010 at 11:55am

Math
In the tests of a new pharmaceutical product, data were collected for use in the approval process required by theU.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data ...
Thursday, June 17, 2010 at 3:23am

biology
a substance needed for the proper functioning of the thyroid gland is
Wednesday, June 16, 2010 at 4:18pm

Education Aed/200
Looking for some credible sources to create an argumentative paper on the topic below. Topic: Should today's education be relevant to tomorrow's job market? My point of view: I think that integrating work experience into a curriculum is an asset to education. Why not ...
Sunday, June 13, 2010 at 5:24pm

chemistry
Data obtained from lab (neutralization): H2SO4: C =1.0mol/l V = 30 mL Initial temp. = 24.1 NaOH c= 1.0mol/L v= 50 mL initial temp. = 23.9 Final temp. of H2SO4 & NaOH = 32.9 Assume specific heat capacity of both these substance is equal to water's = 4.19 Calculate the molar...
Saturday, June 12, 2010 at 3:44pm

Chemistry
You have synthesized a substance from aqueous solution that has a melting point of 152 °C. A pure authentic sample of the intended product has a melting point of 154 °C. The most likely explanation for the difference in melting temperature is that the your product is ...
Friday, June 11, 2010 at 6:59pm

chemistry
Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas. rubidium dihydrogen ...
Sunday, June 6, 2010 at 4:44am

chemistry
Which is the substance dat is oxidised & reduced ? : 2KMnO4 --> K2MnO4 + MnO2 + O2 ?? ( THANKZ ALOOT )
Saturday, June 5, 2010 at 12:03pm

Anatomy & Physiology
Would someone please look over my answers and tell me if any of them are wrong. If they are wrong can u give me the correct answers or tell me where I can find the answer..Thanks 1. The process of breaking a complex substance down into smaller components is called? A- ...
Friday, June 4, 2010 at 9:09pm

chemistry
Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas. sulfur dioxide: S2-(aq), 2O-...
Friday, June 4, 2010 at 7:22pm

chemistry
Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas. sulfur dioxide: S2-(aq), 2O-...
Friday, June 4, 2010 at 6:52pm

chemistry
Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas. sulfur dioxide silver ...
Friday, June 4, 2010 at 6:09pm

Chemistry
Element A (atomic weight 12.01) and element B (atomic weight 16) combine to form a new substance X. Two moles of B combine with one mole of A. Then the weight of one mole of X is........
Thursday, June 3, 2010 at 5:43am

chemistry
What is the specific heat of a substance if it takes 250 J of heat energy to raise the temperature of a 20 g sample from 20 degrees celsius to 45 degrees celcius?
Monday, May 31, 2010 at 3:17pm

Psychology
prepare a 700 to 1,050-word paper in which you analyze the biological, emotional/psychodynamic, cognitive, and behavioral components of eating, substance abuse, sex/gender/sexual, and personality disorders
Saturday, May 29, 2010 at 5:48pm

Anatomy & Physiology 1
Could someone please check over my answers, and let me know if any of them are wrong. If they are wrong could you please give me the correct answer or tell me where I could find it..Thanks in advance for any and all help.... 1. The process of breaking a complex substance down ...
Thursday, May 27, 2010 at 1:29am

Chemistry
For each: Always true /sometimes true/never true. 1) the joule is the SI unit of force 2)the standard heat of formation for a substance is determined at 100 degrees C 3)all free elements in their standard states have a heat of formation of zero.
Monday, May 24, 2010 at 7:38pm

Oceanography/ Chem
-What are the products and reactants of chemosynthesis -What substance cam be measured in the water to estimate the amount of primary production?
Wednesday, May 19, 2010 at 10:39pm

chemistry
Which substance is an electrolyte? C2H5OH C6H12O6 C12H22O11 CH3COOH
Tuesday, May 18, 2010 at 7:13pm

College Chemistry
My professor gave us two homework questions that are a bit confusing, can you help me to get started on them. 1) You have 6g of water (Kf=1.86 C kg/mol). You add and dissolve 2.1 g of a different unknown substance. The freezing point of the solution is -0.3 deg C. What is the ...
Monday, May 17, 2010 at 6:42pm

Physics
An industrial worker accidentally inhaled a radioisotope with an activity of 0.200 kBq. The substance swallowed has a very long effective half-life and therefore the activity will not change significantly during the workers lifetime. Every decay of the isotope releases 1.12 x ...
Monday, May 17, 2010 at 3:03am

Physics
An industrial worker accidentally inhaled a radioisotope with an activity of 0.200 kBq. The substance swallowed has a very long effective half-life and therefore the activity will not change significantly during the workerâ€™s lifetime. Every decay of the ...
Sunday, May 16, 2010 at 12:29pm

science
A substance seems to completely fill a container, but more can be forced in. Is the substance a solid, liguid, gas or none of these????
Wednesday, May 12, 2010 at 12:49pm

Chemistry
Select the two conditions that must be met by a thermochemical equation so that its standard enthalpy change can be written as ÄfH°. a) One mole of each reactant is used. b) All substances are at 0°C and 1.013x105 Pa pressure. c) The reactants are found in their ...
Wednesday, May 12, 2010 at 5:51am

CHEMISTRY
do you agree that HCL is the beast choice for a substance that has both dipersion forces and dipole-dipole forces ? The choices I have are : Br2 HCl H2 CO2 BCl3 HCL is the most sensible answer. Do you reckon so too? thanks andy
Tuesday, May 11, 2010 at 7:40pm

physical science
which substance is a base in this equation, Ba(OH)2 + 2 HNO3
Monday, May 10, 2010 at 8:48pm

chemistry
for a given substance what information links mass to moles? number of particles
Friday, May 7, 2010 at 10:26am

Chemistry
The equilibrium constant (Keq) is the ratio of ____ concentrations to ____ concentrations at equilibrium, with each concentration raised to a power equal to the number of ____ of that substance in the balanced chemical equation.
Friday, May 7, 2010 at 9:15am

college physics
A 215 g sample of a substance is heated to 330 degrees C and then plunged into a 105 g aluminum calorimeter cup containing 165 g of water and a 17 g glass thermometer at 12.5 degrees C. The final temp is 35.0 degrees C. What is the specific heat of the substance?
Thursday, May 6, 2010 at 12:38am

Philosophy
I need help understanding the following passage: “Could we suppose two distinct incommunicable consciousnesses acting in the same body, the one constantly by day, the other by night; and, on the other side, the same consciousness, acting by intervals, in two distinct ...
Wednesday, May 5, 2010 at 9:46pm

chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
Wednesday, May 5, 2010 at 7:28pm

Chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
Wednesday, May 5, 2010 at 5:45pm

Physical Science
with a pure substance how can you tell whether it is a compound or an element?
Wednesday, May 5, 2010 at 1:13pm

College Health
No one seems to want to help me. I just need to find out which questions I did not answer right so I can go back and correct them. 1- The process of breaking a complex substance down into smaller components is called? A- neutralization B- metabolism C- anabolism D- catabolism ...
Monday, May 3, 2010 at 9:14pm

Health (Anonymous)
I have done all the leg work I was just wondering if some1 could let me know how I did is all. 1- The process of breaking a complex substance down into smaller components is called? A- neutralization B- metabolism C- anabolism D- catabolism Answer- C 2- An approach to skin ...
Monday, May 3, 2010 at 3:56pm

chemistry
Does the application of heat to a substance always produce a chemical change? And give examples to support your answer.can someone help me?
Monday, May 3, 2010 at 10:34am

chemistry
Does the application of heat to a substance always produce a chemical change? And give examples to support your answer.can someone help me?
Monday, May 3, 2010 at 10:33am

chemistry
What is DG° at 298 K for the following reaction? Pb(s) + PbO2(s) -> 2PbO(s) Substance DG°f (kJ/mol) at 298 K PbO(s) –187.9 PbO2(s) –217.3
Monday, May 3, 2010 at 8:40am

chemisty
what is the name of this substance K2Cro4
Sunday, May 2, 2010 at 1:32pm

Health
I have already put what I think are the correct answers. I was wondering if anyone could help me with this. I REALLY appreciate your feedback. 1- The process of breaking a complex substance down into smaller components is called? A- neutralization B- metabolism C- anabolism D...
Saturday, May 1, 2010 at 3:11pm

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