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Recent Homework Questions About Substance Abuse

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Physics
I'm also stumped by this one: 3. A bimetallic strip (117 cm by 1 cm by 0.01cm) has aluminum (a = 23x10^-6 1/Celsius) on one side and has steel (a= 12x10^-6 1/Celsius) on the other. It is perfectly straight at room temperature (20 celsius). What change in temperature is ...
Tuesday, December 11, 2012 at 12:24am

Chemistry
please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O
Monday, December 10, 2012 at 10:51pm

Chemistry
The figure below is a heat curve for an unknown outerspace substance discovered by the Mars rover. By understanding the heat curve, scientists can make inferences about the composition of the planet. What is the temperature of fusion, Tfusion, and vaporization, Tvapor, for ...
Sunday, December 9, 2012 at 6:20pm

Chemistry
Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)
Saturday, December 8, 2012 at 9:20am

English - ms. sue
Ms. Sue, my sister write out story here it is. On Monday she looked in her mailbox, although she had no reason to expect a letter so soon. But there it was, a small, square car. She held it in her two hands, testing its weight. It was an invitation to an exhibition of drawings...
Thursday, December 6, 2012 at 8:46pm

pharmaceutical chemistry
when is a substance classified as pharmaceutical aid or necessity?PLEASE HELP ME :)THANKS A LOT.
Thursday, December 6, 2012 at 7:00am

Chemistry (kinetics)
None of the orders in this reaction were 0 order; however, reactions can be 0 order. Using the idea of a reaction mechanism and rate limiting step, explain how a reaction can be 0 order for a substance.
Wednesday, December 5, 2012 at 9:44pm

Science
A radioactive substance is found to register 1000 counts per second on a Geiger counter. Twenty-four hours later it registers 125 counts per second. What is its half-life?
Wednesday, December 5, 2012 at 9:09pm

Chem
upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you
Wednesday, December 5, 2012 at 5:43pm

Science
If a 20 gram sample of a radioactive substance has a half-life of 6000 years, how many grams would be present after 18000 years?
Wednesday, December 5, 2012 at 4:21pm

Physical Science- Help Please!
Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?
Wednesday, December 5, 2012 at 4:13pm

chemistry
upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you
Wednesday, December 5, 2012 at 10:03am

college chemistry
what is the specific heat of a substance that required 800 joules of heat to raise the temperature of 50 grams of it from 20 degrees Celsius to 30 degrees Celsius?
Tuesday, December 4, 2012 at 11:13pm

Science
Which property can be used to help identify an unknown substance? Specific Heat combustion temperature Tyndall effect
Tuesday, December 4, 2012 at 12:21pm

ap chem
A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...
Monday, December 3, 2012 at 3:38pm

ap chemistry
A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...
Monday, December 3, 2012 at 2:11pm

ap calculus
suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A (t) = 160e-.70t. Find the rate of decay of the quantity present at the time when t = 4
Sunday, December 2, 2012 at 9:07pm

20 question please check my answers
1. A sickness resulting from eating food that is not safe to eat empty-calorie foods nutrition foodborne illness nutrient density 2. A nutrient that helps control the amount of fluid in your body sodium calorie protein nutrition 3. A measure of nutrient content relative to ...
Friday, November 30, 2012 at 2:34pm

English and Grammar
first draft of my report and i need help in improving this. i didnt made up all the information here all comes from a book. Dissociative identity disorder is defined in the DSM-IV-TR as the presence of two or more personality identities that repeatedly take control of one’...
Friday, November 23, 2012 at 12:27pm

How do I calculate the number of atoms in a compou
I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element in the compound (It made me calculate that before)
Monday, November 19, 2012 at 11:48pm

chemistry
How do I calculate the number of atoms in a compound (not an element)? I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element ...
Monday, November 19, 2012 at 11:44pm

physics
Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 2.6×10 13 electrons. The elemental charge is 1.6 × 10 −19 C. Answer in units of C
Sunday, November 18, 2012 at 1:43pm

health help me
1. Starches and sugars that provide energy (1 point)kidneys enzymes carbohydrates vitamins 2. The system that removes waste from the body and controls the body's water levels (1 point)excretory digestive system liver kidneys 3. Organs that remove waste material, including ...
Saturday, November 17, 2012 at 9:23pm

chemisrty
When a substance changes from one phase to another, which of the following occurs? the substance loses or gains heat the average kenetic energy of the substance changes the temperature of a substance changes the molecular motion of a substance changes
Friday, November 16, 2012 at 11:14am

Chemistry
The question representing the production of tetraphosphorus trisulfide (P4S3), a substance used in some match hears, is 8P4 + 3S8 ---> 8P4S3. Determine if each of the following statements is correct. If the statement is incorrect, rewrite it to make it correct. a. To ...
Wednesday, November 14, 2012 at 11:05pm

science
what is a form of energy that is always transferred from a warmer substance to a cooler one?
Wednesday, November 14, 2012 at 8:31pm

Pre-calculus
On a chicken farm, the poultry is given a healthy diet to gain weight. The chickens have to consure a minimum of 15 units of substance A and another 15 units of substance B. In the market there are only two classes of compounds: Type 1, with a compoistion of one unit of A to ...
Monday, November 12, 2012 at 1:00pm

chemistry
Which of the following is generally defined as a substance composed of molecules in which two or more nonmetallic elements are joined? A. Binary compound B. Ionic compound C. Molecular compound D. Ternary compound I think A
Saturday, November 10, 2012 at 6:40pm

chemistry
Which of the following is true of a substance with a pH of 11.0? A. The substance is an acid. B. The substance is a base. C. The substance is neutral. D. The substance is a transition metal. I think A
Saturday, November 10, 2012 at 3:28pm

calculus
A sample of a radioactive substance decayed to 94.5% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? (b) How long would it take the sample to decay to 65% of its original amount?
Friday, November 9, 2012 at 6:00pm

Chemistry
find the volume of 56.4 g of a substance that has a density of 2.42 g/mL
Thursday, November 8, 2012 at 5:11pm

math
what is the mass of 12.0 ml of a substance with the density of 0.922 g/cm3? A. 1.11g B. 0.11g C. 11.1 g I think C.
Wednesday, November 7, 2012 at 3:44pm

math
what is the specific gravity of a substance that has a density of 1.59 g/cm3? A. 1.59 g/mL B. 1.59 g C. 1.59 D. 1.59 mL I think B.
Wednesday, November 7, 2012 at 3:17pm

science
what property must a substance have if you want to use the substance to make an aqueous solution
Tuesday, November 6, 2012 at 5:41pm

science
The density of a substance with a mass of 90g is 2 g/cm cubed. What is the volume?
Tuesday, November 6, 2012 at 11:04am

Chemistry HELP ASAP
A Gouy balance is used to determine the magnetic susceptibility of a substance. A strong electromagnet is placed next to the sample, which is on a balance. If the sample is paramagnetic, the mass reading of the balance will increase when the field is switched on. Based on ...
Monday, November 5, 2012 at 11:45am

Chemistry
A Gouy balance is used to determine the magnetic susceptibility of a substance. A strong electromagnet is placed next to the sample, which is on a balance. If the sample is paramagnetic, the mass reading of the balance will increase when the field is switched on. Based on ...
Sunday, November 4, 2012 at 10:24pm

biochemistry
Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of Substance X to ...
Saturday, November 3, 2012 at 9:01am

biochemistry
Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of Substance X to ...
Friday, November 2, 2012 at 6:03am

7th grade health please Ms. Sue?
Hi! Sorry, I don't know what subjects you teach, but can you check my answers please? 1. Starches and sugars that provide energy (1 point) kidneys enzymes carbohydrates vitamins 2. The system that removes waste from the body and controls the body's water levels (1 ...
Wednesday, October 31, 2012 at 7:32pm

Chemistry
You have amisture that is 0.100mol/L in each of the following ions: Cl-, Br-, and I-. (a) Which substance will precipitate first? AgCl, AgBr, AgI? (b)what is the concentration of Ag+ required to start the precipitation of the first substance? ksp (AgCl)= 1.77*10^-10 ksp (AgBr...
Monday, October 29, 2012 at 12:25pm

physical science
A substance whose 0xidation number decreases during a chemical reaction
Sunday, October 28, 2012 at 8:35am

Chemistry - Final Temperature
An unknown mass of each of the following substances, initially at 23.0C, absorbs 1910 J of heat. The final temperature is recorded as indicated. Find the mass of each substance. sand (Tf=62.0C) ethanol (Tf=44.1C) water (Tf=32.1C)
Sunday, October 28, 2012 at 8:11am

Science Asap
As a substance is heated from its liquid phase to its gas phase, what happens to the spacing and speed of its molecules? Thank You for helping.
Saturday, October 27, 2012 at 2:08pm

Chemistry
Calcium carbonate can be used as an antacid to treat excess stomach acidity. What type of substance is calcium carbonate? a. base b. reducing agent c. acid d. buffer
Tuesday, October 23, 2012 at 7:07pm

Chemistry
Which of the following best describes the difference between a mixture and a pure substance? A. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. B. A mixture has the same properties throughout; a pure substance has the ...
Tuesday, October 23, 2012 at 6:48pm

Chemistry
What property must a substance have if u want to use the substance to make an aqueous solution? Grade- 9
Sunday, October 21, 2012 at 1:49am

Chemistry
What property must a substance have if u want to use the substance to make an aqueous solution? Thank you
Sunday, October 21, 2012 at 1:35am

CHEM
Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 55.0 g of...
Thursday, October 18, 2012 at 6:09pm

chemistry
c. A student put 1.18 mole of substance A and and 2.85 mole of substance B into a 10 litre flask which was then closed. The reaction that took place was: A(g)+ 2B(g) 3C(g) + D(g) On analysis the equilibrium mixture at 25 0 C was found to contain 0.376mole of D. Calculate Kc ...
Wednesday, October 17, 2012 at 1:38am

chemistry
Which solvent is more preferential? Solubility of a substance: water- 2.0g/100ml or ether- 6.3g/100ml
Monday, October 15, 2012 at 8:17pm

science
substance a has a boiling point of 80% C and a density of 3.5 g/cc what is it and why
Thursday, October 11, 2012 at 5:57pm

AP Environmental Science
Consider the following heats, copper: 0.384J/g degrees, glass:0.502J/g degrees, water: 4.18J/g degrees, and lead:0.159J/g. Which substance once warmed, would be more likely to maintain its heat and keep you warm through a long party on a cold night?
Wednesday, October 10, 2012 at 4:31pm

Chemistry
An unknown substance has a mass of 16.3 g. The temperature of the substance increases by 20.1 degrees Celsius when 126 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances. ...
Tuesday, October 9, 2012 at 11:18pm

chemistry
A 0.0230 g sample of an unknown was dissolved in 2.260 g of benzene. The molality of this solution, determined by freezing point depression, was 0.0408 m. What is the molecular weight of the unknow substance?
Thursday, October 4, 2012 at 11:23pm

chemistry
Why is gas a chemical reaction not detectable by sight? Explain? my answer is because the atoms or molecules of matter in the gaseous state move freely among each other, and are, in most instances, packed more loosely than the molecules of the same substance in the solid or ...
Thursday, October 4, 2012 at 4:47pm

Organic chemistry recrystallization
Say you have a substance X will .5 g of X dissolve in 5.0 ml of water if boiled at 80 degrees? And at what temperature will crystals begin to form?
Thursday, October 4, 2012 at 1:01am

General Chemistry
Change these word equations into formula equations and balance them. Be sure to use the proper symbols to indicate the state of each substance as given. (a) Magnesium metal is placed into hydrobromic acid solution, forming hydrogen gas and aqueous magnesium bromide. (b) When ...
Wednesday, October 3, 2012 at 10:11am

Physical Science
8 letter word for a substance that can be broken down into two or more simpler substances?
Tuesday, October 2, 2012 at 11:45pm

Chemistry
A 5.00L reaction vessel contains hydrogen at a partial pressure of 0.588atm and oxygen gas at a partial pressure of 0.302atm. The equation is 2H2(g)+O2(g)-> 2H2O(g). Suppose the gas mixture is ignited and the reaction produces the theoretical yield of the product. What ...
Tuesday, October 2, 2012 at 7:50pm

chemistry
A compound has the empirical formula CH2O. When 0.0866 g is dissolved in 1.0 g of ether, the solution’s boiling pint is 36.5oC. Determine the molecular formula of this substance
Monday, October 1, 2012 at 7:04am

chemistry
Calculate the molar mass of a non-electrolyte that lowers the freezing point of 25.0 g of water to - 3.9 oC when 4.27 g of the substance is dissolved in the water.
Monday, October 1, 2012 at 7:02am

chemistry
1.) a buffer is a substance which: a) donates H+ in acidic solutions b) accepts H+ in basic solutions c) accepts OH- in basic solution d) donates H+ in basic solution e) donates OH- in acidic solution f) accepts H+ in acid solution g) accepts OH- in acid solution h) donates OH...
Sunday, September 30, 2012 at 8:25pm

chemistry
a substance has a vapor pressure of 35.0 mmHg at 52.0 degrees Celsius and 70.0 mm Hg at 77.0 degrees Celsius. What is the heat of vaporization for this substance?
Sunday, September 30, 2012 at 5:57pm

Biology
1. How is both the external adn internal stimuli involved in doing this: You are hungry so you reach for an apple in a fruit bowl. 2. Why is a hypothesis important to controlled experiments? Is it becasue you are trying to explain the effect that it would have to a substance ...
Thursday, September 27, 2012 at 8:45pm

education
During the middle of the twentieth century, North American psychology was dominated by A. evolutionary theory. C. neuroscience. B. cognitive development. D. behaviorism. 8. What is a major limitation of the psychophysiological method? A. Investigators can’t be sure that ...
Thursday, September 27, 2012 at 6:32pm

Chemistry
Calculate the density of a substance in pennyweights per peck that has a volume of 0.371 hogsheads and a mass of 41.6 kg. 1 pennyweight = 1.55 grams 1 hogshead = 238.5 liters 1 peck = 9.091 liters. Answer in units of pw/pk.
Thursday, September 27, 2012 at 11:23am

chemistry
a buffer is a substance which? a) accepts OH- in basic solution b) accepts H+ in acid solutions
Wednesday, September 26, 2012 at 9:40pm

Chemistry
Which cannot be broken down chemically or physically into a simpler substance between sugar, salt, seawater, and copper?
Thursday, September 20, 2012 at 2:07pm

Chemistry
Which cannot be broken down chemically or physically into a simpler substance between sugar, salt, seawater, and copper?
Thursday, September 20, 2012 at 2:03pm

Chemistry
2) To the solution in problem 1 (d) at 100 degrees celsius, 10g of water are added, and the solution is cooled to 0 degrees celsius... (problem 1d: the number of grams of water required to dissolve a mixture containing 15 g KNO3 and 3.5 g CuSO4 * 5 H20, assuming that the ...
Tuesday, September 18, 2012 at 9:50pm

science
I need a little assistance. Can you help? The question which seems to be simple enough is What is a physical change? My son answered - A physical change is any change that alters the form or appearance of matter into a different substance. I do not agree. He is missing ...
Monday, September 17, 2012 at 10:57pm

statistics
Each year, approximately 160 colleges compete in the National Concrete Canoe Competition. Each team must design a seaworthy canoe from a substance not know for it's capacity to float. The canoes must weigh between 100 and 350 pounds. Find the midrange weight.
Sunday, September 16, 2012 at 9:44am

Chemistry
How can you predict the heat of combustion for a substance with no carbon atoms?
Thursday, September 13, 2012 at 8:37pm

chemistry
Ethanethiol (CH3CH2SH, pKa=10.6) was named the smelliest substance in existence. Draw the equilibrium that forms when ethanethiol is added to a solution buffered at pH 9, and show the relative proportions of all organic species.
Wednesday, September 12, 2012 at 11:39pm

chemistry
The speed of a substance is 13.056 m/s. What is the speed in cm/Ms??
Tuesday, September 11, 2012 at 12:47pm

CHEMISTRY HELP ASAP!
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and ...
Tuesday, September 11, 2012 at 6:23am

chemistry (need asap!)
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and ...
Tuesday, September 11, 2012 at 4:13am

Science
What is the substance inside the guard cells?
Monday, September 10, 2012 at 5:46pm

chemistry
what is the density of a substance if a 2.50 ml sample has a mass of 0.880g at room temperature? what is the specific gravity of the substance?
Sunday, September 9, 2012 at 11:25pm

chemistry
c= q/m*(delta)T q= heat or energy, measured in joules (J) c= specific heat of the substance m= mass of substance (delta)T= change in temperature It requires 14,749 J to heat 75.0 g of water from 20.0 degrees C to 67.0 degrees C?
Sunday, September 9, 2012 at 4:59pm

chemistry
What is the density of a substance that weighs 500g and fills a container that is 1/2 liter in size?
Thursday, September 6, 2012 at 7:57am

POl
An inactive substance or simulated medical procedure is called a
Sunday, September 2, 2012 at 6:39pm

substance abuse couseling
Process 1.Prewrite about your field of study and create a specific job for which you might want to apply at a particular business or organization in your area.Outline what that position would look like.Brainstorm details,names,titles,and facts to provide depth to your ...
Wednesday, August 29, 2012 at 5:17pm

Math
Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 5 hours.
Tuesday, August 28, 2012 at 6:58pm

Chemisty
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance
Thursday, August 23, 2012 at 7:18pm

chemistry
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance
Wednesday, August 22, 2012 at 11:41pm

chemistry
On the pH scale, any substance with a value between 8 and 14 is considered _________.
Tuesday, August 14, 2012 at 2:58pm

chemistry
Calculate the following quantities. (See the periodic table.) (a) mass, in grams, of 2.54 10-2 mol of CdS g (b) number of moles of NH4Cl in 90.0 g of this substance mol (c) number of molecules in 5.081 10-2 mol C6H6 molecules (d) number of O atoms in 4.72 10-3 mol Al(NO3)3
Thursday, August 2, 2012 at 12:17am

science
what shows that the sea water is a mixture and not a pure substance? a. it has a sharp boiling point b. it has definite composition c. it consist of a single phase d. the components lose their individual properties
Tuesday, July 24, 2012 at 8:07pm

chemistry
i had 2 question left to finish but i cant really undersdand how to do it 9)design an elextrochemical cell using Pb(s) and Mn(s) and theire solutions and answer the following questions: i answerd a-i all that is left is j which is: indicate the substance oxidise,substance ...
Tuesday, July 24, 2012 at 6:09pm

Chem
suppose you could not tell whether a material was insoluble or slightly soluble in water form the appearance of the misture. Explain what you would do to determine whether this substance is slightly soluble.
Monday, July 23, 2012 at 4:32pm

chemistry
3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown
Wednesday, July 18, 2012 at 6:29am

Science
What fraction of the original activity of a radioactive substance will remain at the end of half-life?
Monday, July 16, 2012 at 4:50am

science
what substance is being reduced in the following redox reaction? HgCl2 + Sn^2 = Sn^4 + Hg2Cl2 + Cl-
Friday, June 29, 2012 at 9:20pm

Chemistry
An impure sample of substance X melts at about 113 degress. Which of the substances could be X and state y Resorcinal 111 degrees Catechol 105 Nitrophenol 114 Butanamide 115 I think it is either catechol or resorcinol because as stated the higher the percentage of impurity the...
Tuesday, June 26, 2012 at 7:41pm

Physics
The pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas (γ = 5/3). The process A-B is adiabatic. At point A, the pressure is 2.70×105 Pa and the volume is 0.0180 m3. At point B, the volume is 0.0450 m3. During a cycle, ...
Monday, June 25, 2012 at 11:18am

Chemistry(check)
Please check for me. 1. For the reaction CH3COOH--->CH3COO + H+, which of the following statements is true? CH3COOH is a Brønsted-Lowry acid.<--- CH3COO is an Arrhenius base. CH3COO is a Lewis base. CH3COOH is a Brønsted-Lowry base. 2. Of the metals Pb, Mg...
Friday, June 22, 2012 at 5:29pm

Chemistry
A calorimeter contains 30.0 mL of water at 11.0 degrees C. When 1.50 g of X (a substance with a molar mass of 65.0 g/mol) is added, it dissolves via the reaction: X (s)+H2O (l) ---> X (aq) and the temperature of the solution increases to 26.0 degrees C. Calculate the ...
Thursday, June 21, 2012 at 9:00pm

Chemistry(Please Respond)
Willsomeone, please check my answers? (<-----) indicates my answer. 1.A student increases the temperature of a 556 cm³ balloon from 278 K to 308 K. Assuming constant pressure, what should the new volume of the balloon be? 320 cm3 501 cm3 1232 cm3 616 cm3<------ 2. ...
Thursday, June 21, 2012 at 8:10am

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