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physics
What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
Friday, February 24, 2012 at 3:30am

life orientation
substance abuse of both legal and illegal drugs among the youth
Thursday, February 23, 2012 at 9:48am

chemistry
Technically it really makes no difference which we call the solute and which the solvent. By convention, we usually say the solid is the solute and the liquid is the solvent. In liquid/liquid solutions, we usually call the smaller amount of substance the solute and the higher ...
Tuesday, February 21, 2012 at 9:19pm

physics/chemistry
Electrical conductivity is a physical property. A chemical property involves a change that occurs. However, when electricity passes through an object or substance, no change occurs.
Tuesday, February 21, 2012 at 11:49am

chemistry
The initial concentration of the a substance was 1.95 M. After 27.72 hours the concentration was 0.9750 M. After anothers 55.44 hours the concentration was 0.4875 M (total time = 83.16 hours). If another experiment were conducted in which the initial concentration was 0.427 M...
Saturday, February 18, 2012 at 11:47pm

Chemistry
How do you calculate the mass in kilograms of 3.99 liters of acetic acid. The density of this substance is 1.05 g/mL.
Saturday, February 18, 2012 at 10:50pm

Chemistry
There are about 5 definitions. The three most popular ones in use today (tomorrow may be a different story) are 1. The Arrhenius theory-- A base is a substance that produces hydroxide ions when placed in water solution. 2. The Bronsted-Lowry theory-- A base is a substance that...
Friday, February 17, 2012 at 4:16pm

Help me please I dont know this quation
How to affect lattice energy,charge on the ion and radius of the ion, the solublity of the substance. please if it is possible with example
Friday, February 17, 2012 at 7:45am

chemistry
Can you determine the molecular formula of a substance from its percent composition?
Wednesday, February 15, 2012 at 1:51pm

chemistry
I think the limiting reagent is Al. Your 68.8g, however, is correct for theoretical yield of Al2O3 which means you must have used 36.4g Al to solve for g Al2O3. The limiting reagent is the substance that is completely used. %yield is correct.
Tuesday, February 14, 2012 at 11:03pm

college physics
calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
Tuesday, February 14, 2012 at 9:06pm

college physics
calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
Tuesday, February 14, 2012 at 9:06pm

5th grade science
A substance seems to completely fill a container, but more can be forced in. The substance is a
Tuesday, February 14, 2012 at 8:01pm

chemistry
Reactions in which a substance decomposes by losing CO are called decarbonylation reactions. The decarbonylation of acetic acid proceeds as follows: CH3COOH(l)= CH3OH(g)+ CO(g. By using data from Appendix C in the textbook, calculate the minimum temperature at which this ...
Tuesday, February 14, 2012 at 7:31pm

Chemistry(Please help, thank you)
It means you use the #moles of the substance you've already calculated.
Monday, February 13, 2012 at 9:49pm

Chemistry(Please help, thank you)
For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that?
Monday, February 13, 2012 at 9:31pm

Chemistry
For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that?
Monday, February 13, 2012 at 8:00pm

Chemistry
I had to perform an experiment using a coffee-cup calorimeter to determine the enthalpies of two seperate reactions. For part 1 we worked with magnesium metal, and magnesium oxide. Data was collected and now I need to find the q, heat transferred for both magnesium and ...
Monday, February 13, 2012 at 7:18pm

Chemistry
Then it says that to find deltaH rxn the equation is qrxn/mol substance. So I use the 30267.23 / 0.152 to get my answer correct?
Monday, February 13, 2012 at 6:07pm

Chemistry
I am having a little trouble understanding exactly what you did and exactly what you want to calculate? Generally, these experiment are to determine q/g or q/mol for a substance, in this case q/g for Mg and q/g for MgO. The other thing I'm having trouble with is you had 0....
Monday, February 13, 2012 at 5:24pm

Chemistry
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are a. ƒ´Tf and Kf only. b. ƒ´Tf , Kf and mass of solute. c. ƒ´Tf , Kf , mass of solute and mass of ...
Monday, February 13, 2012 at 1:59pm

chemistry
All of your answers should be reversed. Oxidation is the loss of electrons. Reduction is the gain of electrons. The substance oxidized is the reducing agent. The substance reduced is the oxidizing agent. Mg goes from zero oxidation state on the left to +2 on the right. That is...
Saturday, February 11, 2012 at 3:10pm

Chemistry(Please check)
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are: a) delta T and Kf only b) delta T, Kf, and mass of solute c) delta T, Kf, mass of solute, and mass of solvent d) delta T, Kf, ...
Saturday, February 11, 2012 at 9:50am

Chemistry(Please check)
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are: a) delta T and Kf only b) delta T, Kf, and mass of solute c) delta T, Kf, mass of solute, and mass of solvent d) delta T, Kf, ...
Friday, February 10, 2012 at 11:54pm

chm
An unknown radioactive substance has a half-life of 3.20 . If 34.8 of the substance is currently present, what mass was present 8.00 hours ago?
Friday, February 10, 2012 at 12:23am

Chemistry
I don't have the appendix from your text. Look in that list, find a substance with a pKa of as close to 9.40 and go from there.
Wednesday, February 8, 2012 at 12:39pm

Chemistry
The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K
Tuesday, February 7, 2012 at 8:51pm

Chemistry
The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K measured at ...
Tuesday, February 7, 2012 at 8:00pm

science
How is temperature related to the average kinetic energy of molecules that make up a substance?
Tuesday, February 7, 2012 at 3:22am

physics
The specific temperature at which a substance changes from a liquid to a gas is an example of a?
Monday, February 6, 2012 at 7:53am

science
Can you help me with these question(s) please??? What substance does a cell use to power active transport? Describe the movement of material during diffusion. Describe the movement of material during active transport. I would appreciate any help whatsoever. Thank you. kathy
Sunday, February 5, 2012 at 12:14pm

chemistry
A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The alcohol content (...
Sunday, February 5, 2012 at 8:26am

chemistry
Radioactive materials are often used in biological studies. A radiation biologist studies the rate of decomposition of a certain substance and obtains the following data: Time(days) 0 4.0 8.0 12.0 16.0 Mass (μg) 15.50 10.90 7.67 5.39 3.79 Determine the rate constant in ...
Saturday, February 4, 2012 at 9:02pm

Chemistry
I assume you are asking which substance decreased the temperature when dissolved in water? I also assume you did the experiment. Look at your notes. Or are you trying to dry lab the experiment?
Saturday, February 4, 2012 at 1:01pm

chemistry
The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are a. delta Tf and Kf only. b. delta Tf , Kf and mass of solute. c. delta Tf , Kf , mass of solute and mass of solvent. d. delta Tf , ...
Friday, February 3, 2012 at 4:40pm

social studies
Just for fun sometimes I pick out one of the gripes about King George that Jefferson expressed and see how we are doing. For example: "He has erected a multitude of new offices, and sent hither swarms of officers to harass our people, and eat out their substance. " ...
Wednesday, February 1, 2012 at 11:53pm

Math
To have a constant concentration of .25 ppm of a substance with 18,000gal/water flowing, how much would I need to add per minute? Does that make any sense? How would I go about answering that? I don't want the answer, but maybe just a push in the right direction because I ...
Wednesday, February 1, 2012 at 11:41am

chem grade 12
Consider the following substance: Al2(SO4)3 What is the oxidation number of: a) aluminum b) sulfur c)oxygen
Tuesday, January 31, 2012 at 9:49pm

Chem
2 is neither. Adding PCl3 does not change the concn. Solids, if that is their normal state as in the carbon question before, and liquids (if that is their normal state) are not included in Keq. 3 is the opposite to your answer for the same reasons that your 4 and 5 are correct...
Sunday, January 29, 2012 at 10:01pm

Chemistry
A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?
Wednesday, January 25, 2012 at 11:38am

Chemistry
Four individual measurements go into determining the specific heat. q = mass x specific heat x (Tfinal-Tinitial) q is how much heat is added. mass is mass of the substance. Tfinal is the final T of the substance Tinitial is the initial T of the substance. An increase in ...
Monday, January 23, 2012 at 8:47pm

physics
1. Calculate the radius of orbit for a hydrogen electron in the n=3 level. 2.The half life of an unknown substance is one minutes. If the initial number of particles is 20 how many particles will remain after two minutes have elapsed?
Monday, January 23, 2012 at 6:23pm

chemistry
A certain substance has a heat vaporization of 47.97 kJ/mol. At what Kelvin temperature will the vapor pressure be 7.50 times higher than it was at 297K? Please help me! I don't understand heat vaporization questions
Monday, January 23, 2012 at 1:27am

chemistry
A top is used to keep evaporation of the solvent to a minimum. Different substances travel different distances because each substance has a different adsorbance to the stationary and moving phases.
Saturday, January 21, 2012 at 2:51pm

physics
What is anionic bond?what type of substance.form ionic bond?
Saturday, January 21, 2012 at 10:36am

physics
What is a covalent bond?what type of substance form covalent bonds?
Saturday, January 21, 2012 at 12:02am

chemistry
As the temperature of a gaseous substance is decreased at constant pressure, it will undergo a series of physical changes. Which is the correct sequence of physical states that will be encountered? a.Liquid, solid, gas b.Gas, solid, liquid c.Solid, liquid, gas d.Gas, liquid, ...
Friday, January 20, 2012 at 1:52pm

chemistry
As the temperature of a gaseous substance is decreased at constant pressure, it will undergo a series of physical changes. Which is the correct sequence of physical states that will be encountered?
Friday, January 20, 2012 at 1:49pm

History
The Harlem Renaissance Poets and Musicians by Samuel Black ABSTRACT This essay provides educational information regarding some of the major poets and musicians during the Harlem Renaissance period of 1919 to 1940. The purpose is to educate individuals about the “African-...
Wednesday, January 18, 2012 at 10:09pm

Science
•the color changes •the texture (the way something feels) changes, and can't be changed back •gas bubbles are formed •a new substance is formed •energy is taken in or given out in a reaction-burning and electricity are examples I got these answer ...
Wednesday, January 18, 2012 at 8:32pm

Science
There may be many indicators of a chemical change. Here are a few although not all can categorically indicate a chemical change: •Gas or bubbles are formed •Heat, light, or sound is given off •Change in color •Different taste or smell (never taste or smell ...
Wednesday, January 18, 2012 at 8:31pm

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 ...
Wednesday, January 18, 2012 at 9:51am

Physics
when temp increase,that mean average KE increase,if state change from solid to liquid or liquid to solid ,potential energy increase For IDEAL GAS,it wont change to any state under HIGH TEMP LOW PRESSURE,so average KE increase but potential energy remains unchange as far as we ...
Wednesday, January 18, 2012 at 8:39am

Physics
What happens to the internal energy of an ideal gas when it is heated from 0C to 4C? a. increases b. decreases c. change in number of atoms d. increase in volume of substance
Tuesday, January 17, 2012 at 11:56pm

physics
a. increases b. decreases c. change in number of atoms d. increase in volume of substance
Tuesday, January 17, 2012 at 10:08pm

science
mat·ter/ˈmat&Ea​cute;™r/ Noun: Physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, esp. as... Verb: Be of importance; have significance: "what did it matter to...
Tuesday, January 17, 2012 at 9:13pm

Chemistry Problem - hard :<
Man in the vat problem. Long ago, a workman at a dye factory fell into a vat containing a hot concentrated mixture of sulfuric and nitric acids. He dissolved completely! Because nobody witnessed the accident, it was necessary to prove that he fell in so that the man’s ...
Monday, January 16, 2012 at 5:52pm

College Chem
A 2.446-g sample thought to contain only one volatile substance, MgCO3, was heated in a nitrogen atmosphere for 30 min. After cooling, the residue weighed 2.216 g. Calculate the percentage of magnesium carbonate in the sample.
Monday, January 16, 2012 at 5:47pm

Chemistry
1) Consider the following substance: V3N5. What is the oxidation number of vanadium and nitrogen? 2) Consider the following substance: Mn2O7. What is the oxadation number of manganese and oxygen? 3) Consider the following reaction: Al2(SO4)3. What is the oxidation number of ...
Friday, January 13, 2012 at 5:10pm

Chemistry
Why dencity classfied in intensive propertie s? dencity is not depend on amount of substance? Please help us
Tuesday, January 10, 2012 at 6:38pm

physics
a cube of side L is made of a substance that is 1/4 as dense as water. WHen placed in a calm water bath the cube will a) float with 1/2 L abovethe surface b)sink to the bottom, c) float with 1/4 L above the surface d) float with 1/4 L below the surface e) float with 3&...
Sunday, January 8, 2012 at 6:09pm

Chemistry
If the density of a substance is 15.2 g/mL, what is the density in cg/kl?
Saturday, December 31, 2011 at 3:25pm

math
for each pair of substances, circle the substance with more thermal energy and explain why? A0 500g of water at 35 degree C VS. 500 g of water at 85 degree C B) 500 g of water at 35 degree C VS. 250 g of water at 35 degree C
Monday, December 19, 2011 at 12:02am

Chemistry
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25°C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed ...
Thursday, December 15, 2011 at 12:59pm

Chemistry
Use the coefficients in the balanced equation to convert moles of one substance to moles of another.. 0.190 mole Ba3N2 x (3 moles Ba/1 mole Ba3N2) = 0.190 x 3/1 = ?
Wednesday, December 14, 2011 at 10:31pm

Calculus
Write a differential equation to model the situation given. Do not solve. The radioactive substance neptunium-139 decays to 73.36% of its orginal amount after 24 hours. How long would it take for 43% of the original neptunium to be present? What is the half-life of neptunium-139?
Wednesday, December 14, 2011 at 12:01pm

chemistry
The vapor pressures of several solutions of water-propanol(Ch3Ch2Ch2OH) were determined at various compositions, with thefollowing data collected at 45C: XH2O Vapor pressure (torr) 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 1.00 71.9 a.) Are solutions of water and ...
Tuesday, December 13, 2011 at 7:39pm

chemistry
a solid substance has a density of 4.36 g/ml. what is the volume of 30 g of this substance?
Monday, December 12, 2011 at 8:51pm

chemistry
A solution was made by dissolving 10.0g of a nonvolatile nonelectrolyte compound in 100.0g of water froze at -0.93C. What is the approximate molecular weight of the substance. (for water..kf=1.86C/m) (m is molality)
Monday, December 12, 2011 at 5:10pm

chemistry
A reaction "goes" if one of three things happen. a. a ppt forms, b. a gas forms, or c. a slightly ionized substance forms. example c. The balanced formula equation follows: K2CO3(aq) + MgCl2(aq) ==> MgCO3(s) + 2KCl(aq) For the complete ionic equation you separate ...
Sunday, December 11, 2011 at 9:55pm

Chemistry
These react 1:1; i.e., NaOH + HCl ==> H2O + NaCl So which has the fewer moles? moles = M x L = ? Use that substance to determine how much NaCl is formed.
Saturday, December 10, 2011 at 5:32pm

Physics
Two bars of identical mass are at 34 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 97 °C, ...
Thursday, December 8, 2011 at 10:28pm

Alg2
Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.
Thursday, December 8, 2011 at 7:37pm

social studies
Natural rights: He has refused his Assent to Laws, the most wholesome and necessary for the public good. Social contract: He has erected a multitude of New Offices, and sent hither swarms of Officers to harrass our people, and eat out their substance. Consent of the governed ...
Thursday, December 8, 2011 at 5:30pm

social studies
Certainly you can find some grievances that fit those categories: "He has refused his Assent to Laws, the most wholesome and necessary for the public good. He has forbidden his Governors to pass Laws of immediate and pressing importance, unless suspended in their ...
Thursday, December 8, 2011 at 5:08pm

Chemistry
Reposting with correct information..Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25°C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in...
Thursday, December 8, 2011 at 4:51pm

Physics
A copper calorimetric cup with a mass of 100g contains 96g of water at 13 C. If 70g of a substance at 84 C is dropped into the cup, the temperature increases to 20 C. Find the specific heat capacity of the substance
Thursday, December 8, 2011 at 2:35am

Physics
When 2.1x10^3 J of heat is added to 100.g of a substance, its temperature increases from 15 C to 40 C. What is the specific heat capacity of the substance? Answer is 8.4x10^2 but I need to see the work involved in how to solve the problem
Thursday, December 8, 2011 at 2:35am

Chemistry
Sorry, I didnt realize that data didnt attach...here it is..thank you for all your help! Substance ∆Gf° C6H6 (l) 124.50 kJ/mol C6H6 (g) 129.66 kJ/mol CCl4 (l) -65.21 kJ/mol CCl4 (g) -60.59 kJ/mol
Wednesday, December 7, 2011 at 8:31pm

Alg2
Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.
Tuesday, December 6, 2011 at 9:50pm

chemistry
A particular radioactive substance has a half-life of 4 minutes. How long will it take for 250 g of this radioactive material to decay to less than 0.1g? 24 min 36 min 40 min 48 min 72 min I got 32 min but that not one of the choices. Please help
Monday, December 5, 2011 at 2:53pm

chemistry
Consider a liquid at 90 bar and 40 °C. What is the change in entropy of the substance as you change the conditions to 1 bar and 150 °C by expanding the liquid while heating? Vapor pressure = 59.2 bar heat of vaporization = 1.82 kJ/mol , both at 150 degree C Heat ...
Saturday, December 3, 2011 at 5:28am

Chemisrty
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25°C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed ...
Thursday, December 1, 2011 at 8:51pm

Calculus
A certain magical substance that is used to make solid magical spheres costs per cubic foot. The power of a magical sphere depends on its surface area, and a magical sphere can be sold for per square foot of surface area. If you are manufacturing such a sphere, what size ...
Thursday, December 1, 2011 at 5:31pm

Chemistry
The substance oxidized is the one that loses electrons. The substance reduced is the one that gains electrons. It looks like Fe changes from zero to +2 and oxygen changes from zero to -2. Fe ==> Fe^2+ + 2e O2 +4e + 2H2O ==> 4OH^- Multiply #1 by 2 and #2 by 1 and add them...
Wednesday, November 30, 2011 at 6:26pm

Chemistry
the corrosion of iron is similar to the reactions that occur in an electrochemical cell. Oxidation and reduction occur at separate places on the metal and the circuit is completed by an electrolyte in solution one possible corrosion is Fe(s)+O2(g) + H2O(l) --> Fe^2+(aq) + ...
Wednesday, November 30, 2011 at 5:57pm

phiscal science semester 2
For the reaction C2H6+O2>CO2+H2O what are the coefficient to the chemical substance it goes with for balanced reactions?
Monday, November 28, 2011 at 9:09pm

Question
If I join these clubs in high school will I make it to Ivy League Schools Computer Club Any student interested in computers will learn skills such as creating web designs and building PCs. Students will also have the opportunity to learn advanced techniques using computer ...
Sunday, November 27, 2011 at 4:57pm

science HElp
Ph scale Which on is true A substance with ph is twice as acidic as substance with ph of 4. A subtances with ph 3 is 10 as acidic as substance with ph of 4. A substance with ph 3 twice as alkies as substances with ph 4. a substancs with ph 3 10 time alkies as substance with ph...
Wednesday, November 23, 2011 at 7:14pm

Chemictry
A calorimeter contains 32.0 of water at 11.5. When 1.70 of (a substance with a molar mass of 74.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 26.5. Calculate the enthalpy change, , for this reaction per mole of . Assume that the ...
Friday, November 18, 2011 at 8:56am

Chem
How would one balance the following redox reaction using the half reaction method? Fe(OH)2 + O2 + H2O ---> Fe(OH)3 This is in my chemistry teacher's homework, and it comes up with an answer, but I don't see how to use the half reaction method when there is only one ...
Tuesday, November 15, 2011 at 10:31pm

Chemistry
I agree with Lisa. It takes energy to sublime a substance; it takes energy to melt a substance.
Monday, November 14, 2011 at 9:23pm

psychology
# 1.1 (1 pts.) Roger is experiencing a memory loss that may be related to recently contracting herpes. Which of the following diagnoses would best fit his condition? A) dissociative amnesia B) retrograde amnesia C) amnestic disorder due to a general medical condition D) ...
Saturday, November 12, 2011 at 12:37am

chem
Is there any simple way to predict the volume of a second back titration done on a particular antacid substance after completing a titration the first time around?..Thank you every one for responses.
Thursday, November 10, 2011 at 3:31pm

chemestry
1. You need to learn how to spell chemistry. 2. You need to redo this post. 16.0 what of water. 15.0 what T. 1.60 what of substance. No reaction is given.
Wednesday, November 9, 2011 at 2:24pm

chemestry
A calorimeter contains 16.0 of water at 15.0. When 1.60 of (a substance with a molar mass of 58.0 ) 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 ...
Wednesday, November 9, 2011 at 1:35pm

advanced math
What is the half life of a substance if it decays by 75% in two weeks?
Wednesday, November 9, 2011 at 10:53am

chemistry
Oxidation is the loss of electrons. Reduction is gain of electrons. Substance oxidized is reducing agent. Substance reduced is oxidizing agent.
Wednesday, November 9, 2011 at 1:22am

Chemistry
Substance A has a normal fusion point of ‑10.0 oC, an enthalpy of fusion = 150.0 J g^-1; specific heats for the solid and the liquid are 3.00 and 6.20 J g^-1 oC^-1, respectively. How much heat, in J, is required to change 150 grams of A from a solid at –40.0 oC to a...
Tuesday, November 8, 2011 at 8:25pm

basic chemistry
a substance that cannot be broken down into susbtances by ordinary chemical means is
Tuesday, November 8, 2011 at 6:17pm

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