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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

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

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

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

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

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
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

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

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

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

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

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 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

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
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
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

health
9. Human blood, which has a pH of approximately 7.4, is a/an _______ substance.
Sunday, November 6, 2011 at 1:21am

SUBSTANCE ABUSE COUNSELOR
SOMEONE WHO'S TAKING PENNFOSTER SUBSTANCE ABUSE COUNSELOR
Friday, November 4, 2011 at 11:19pm

physical science
A certain radioactive substance has a half-life of 1 hour. If you start with 1 gram of the material at noon, how much will be left at 3:00 P.M.? At 6:00 P.M.? At 10:00 P.M.?
Wednesday, November 2, 2011 at 10:08pm

BioChem
If you want to determine the actual salicylate concentration for a sample that gives you a darker color than the highest standard, you would need to make a dilution of it. If you dilute it by mixing .25 mL of sample with .75 mL of water and then find that this mixture has a ...
Monday, October 31, 2011 at 10:38pm

Science
Study the data table below. A three-column table presenting the 'Melting Point and Boiling Point for Common Substances.' The column headers are 'Substance,' 'Melting point (°C),' and 'Boiling point (°C).' For substance aluminum, the ...
Monday, October 31, 2011 at 6:10pm

English
Can you help me write an essay of 450 words on the topic " Substance Abuse in schools"
Sunday, October 30, 2011 at 8:34am

Chemistry
If 0.274 moles of a substance weighs 62.5g, what is the molar mass of the substance? 62.5/0.274 = 228.1 Am I on the right track?
Tuesday, October 25, 2011 at 8:17pm

Pre Calculus
Exponential growth and decay find the half life of a radioactive substance if 220 grams of the substance decays to 200 grams in 4 years?
Tuesday, October 25, 2011 at 1:40am

Chemistry 10
The accelerator pedal in the car is pressed, resulting in a faster consumption of fuel in the engine. Now according to previous answers to this question the answers concentration but I do not understand how. I though concentration is the amount of a substance dissolved in a ...
Sunday, October 23, 2011 at 2:41pm

Pre Calculus
Exponential Growth and Decay Find the half-life of a radioactive substance that decays by 5% in 9 years.
Saturday, October 22, 2011 at 7:23pm

Algebra
An isotope of Glopenium disintegrates according to the formula A(t) = Ao2^-0.0345t where Ao is the initial mass of the substance and t is the time in years. If there are 2 milligrams of Glopenium now, find the number of milligrams that will be left after 35 years. Your answer ...
Friday, October 21, 2011 at 3:55pm

Biology
You are supposed to add 0.1 mol of a substance with molecular weight = 354.9 to 1 liter of water. How much should you add? Choose one.
Thursday, October 20, 2011 at 10:00am

chemistry 110
in regards to conductivityhow is a substance/solute classified as strong, weak or nonelectrolyte
Wednesday, October 19, 2011 at 11:30pm

science
A substance seems to completely fill a container, but more can best forced in. The substance is a__________. A. solid B. gas C. liquid D. none of these
Tuesday, October 18, 2011 at 10:00pm

Math/Calculus
After 5 days, a particular radioactive substance decays to 37% of its original amount. Find the half life of this substance. Is this right? Th= ln 2/ln(1/.37) x 5 days
Monday, October 17, 2011 at 8:32pm

Analytical Chemistry
Calculate the number of grams needed to be dissolved and diluted to 100 ml to prepare 0.200M solution for the following substance BaCrO4. huh?
Sunday, October 16, 2011 at 5:49pm

Chemistry
In one experiment, the mass of water is 92.6 grams, the initial temperature of the water is 67.6oC, the mass of liquid nitrogen added to the water is 61.4 grams, and the final temperature of the water, after the liquid nitrogen has vaporized, is 35.6oC. Specific heat of water...
Thursday, October 13, 2011 at 7:21pm

Chemistry (PLEASE HELP ME)
1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed horizontally to the S-L or L-G...
Thursday, October 13, 2011 at 1:30pm

Chem
1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed horizontally to the S-L or L-G ...
Thursday, October 13, 2011 at 1:10pm

science
How is the temperature of a substance related to the energy of movement of the particles in the substance?
Wednesday, October 12, 2011 at 7:21pm

chmistry
what substance has the density of .60g/ml
Tuesday, October 11, 2011 at 6:09pm

chemistry
A solid substance P is soluble in water (1g/ 100mL) at 25°C and 10g/ 100mL of water at 100°C. You are given a sample that contains 10g of P and 2g of impurity G. Describe the procedure to purify P if G is insoluble in water.
Thursday, October 6, 2011 at 5:47pm

chemistry
A solid substance P is soluble in water (1g/100 mL) at 25 degrees and 10g/100mL of water at 100 degrees. You are given a sample that contains 10 g of P and 2g of impurity G. If G has the same solubility as P, describe how you could purify P.
Thursday, October 6, 2011 at 5:04pm

Identify Topic Sentence
Read each of the following paragraph and underline the topic sentence. Many plant foods naturally contains toxins in small amounts, so through they're generally safe to eat, consuming them in very large amounts could be harmful. Potatoes that have been exposed to light ...
Tuesday, October 4, 2011 at 11:52pm

Identify Topic Sentence
Read each of the following paragraph and underline the topic sentence. Many plant foods naturally contains toxins in small amounts, so through they're generally safe to eat, consuming them in very large amounts could be harmful. Potatoes that have been exposed to light ...
Tuesday, October 4, 2011 at 11:51pm

156
is this a strong thesis statement? Legalizing marijuana has many benefits such as, reducing overcrowding in prisons, helping create jobs for low to mid income individuals, reduce the budget for ”the war on drugs” and can treat different medical problems. Legalizing ...
Thursday, September 29, 2011 at 9:38pm

Organic Chemistry
What are the advantages of using a solvent pair for recrystallization? Select all that apply. A) You can control the solubility of the substance in the mixed solvent. B) You don't have to know the exact amounts of the solvents needed. C) You can quickly make the solution ...
Thursday, September 29, 2011 at 6:52pm

alcohol counselor
Select one core function you have learned about so far and describe at least three global criteria. Explain why you believe these criteria are important elements in the substance abuse counseling process.
Thursday, September 29, 2011 at 8:57am

science
if you filled a 150ml container w/100ml of substance and the substance quietly filled the container what would it be
Tuesday, September 27, 2011 at 8:28pm

physical science
give one word/term for each of the following descriptions. 1.A substance that donates electrons in chemical reaction. 2.The formula showing the simplest whole number ratio in which the atoms combine to form a compound.
Tuesday, September 27, 2011 at 12:39pm

science
a scientist has two samples of a substance. both samples have the same temperature. one sample has a mass of 10 g. the other sample has a mass of 20 g. compare the average kinetic energy and total kinetic energy of the particles in each sample.
Monday, September 26, 2011 at 7:54pm

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent.(My answer) 2. ...
Monday, September 26, 2011 at 3:43pm

chemistry
10.0mL of a pure liquid substance has a mass of 25.0 g. What is the mass of 3.00 L of the substance?
Monday, September 26, 2011 at 5:27am

Physical Science
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 substance have very different melting temperatures and densities. The unknown substance is most likely a ...
Sunday, September 25, 2011 at 4:12pm

chemistry
Try to balance the following reactions by inspection. In each reaction, identify the substance reduced and the substance oxidized. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.) (a) CH4(g) + S(s) ¨ CS2(l) + H2S(g)
Saturday, September 24, 2011 at 11:25am

Chemistry
1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...
Friday, September 23, 2011 at 12:27pm

Chemistry
Write down (a) condensed and (b) skeletal structural formulas for isomers of an organic substance whose chemical formula has 5 carbon atoms and 12 hydrogen atoms and (c) provide the common name for each of the isomers
Friday, September 23, 2011 at 9:48am

chemistry
Calculate the grams of substance required to prepare 250mL of 5%(wt/vol) NaNO3
Thursday, September 22, 2011 at 10:33pm

chemistry
Substance A has a specific heat of .650J/gK and substance B has a specific heat of .325J/gK. If 100 J of energy is applied to a 10 g sample of each substance, which will have a higher temperature?
Monday, September 19, 2011 at 8:53pm

chemistry
Substance A has a specific heat of .650J/gK and substance B has a specific heat of .325J/gK. If 100 J of energy is applied to a 10 g sample of each substance, which will have a higher temperature?
Monday, September 19, 2011 at 8:51pm

physical science
which of the following statements correctly describes the substance with the formula KI?
Monday, September 19, 2011 at 1:37am

CRT 205
Can someone review this and let me know if it is acceptable?? This class was so hard and it has been all i can do to pass it! Here is the article i chose Addiction Is a Choice, Not a Disease Addiction , 2009 Content Level = Intermediate Dale Netherton, "It's Not ...
Saturday, September 17, 2011 at 1:04am

chemistry
B. Everyone knows that water is supposed to boil at 100° C. Why did your water sample boil at a different temperature? C. While heating two different samples of water at sealevel, one boils at 102o C and one boils at 99.2o C. Calculate the percent error for each from the ...
Friday, September 16, 2011 at 6:30pm

chem
The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
Thursday, September 15, 2011 at 8:10pm

science
The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
Thursday, September 15, 2011 at 7:49pm

chemistry
The primary substance from which all other chemical compounds and substances are made is a____________. A) element B) compound C) mixture D) pure substance
Thursday, September 15, 2011 at 7:25pm

biochemistry
Reaction A B proceeds with H = 240 kJ×mol-1; S = 40 J×K-1×mol-1. Substance A was taken at initial concentration 2 mM. Determine the concentrations of A and B after the reaction reaches equilibrium at 298 K.
Wednesday, September 14, 2011 at 11:45pm

chemistry
how do you calculate density of a substance with a mass of 100g and a volume of 48ml
Sunday, September 11, 2011 at 1:24pm

substance
Has anyone read the book begging for change by Robert Eggert. I am having a hard time analyzing chapter two and three. Can you please help me.
Tuesday, September 6, 2011 at 12:10pm

chemistry
If you have 12 moles of a substance, how many molecules do you have of that substance? Suppose the substance has a molecular weight of 342. How many grams of that substance would you have to dissolve in a liter of water to make a 12 M solution?
Saturday, September 3, 2011 at 6:44pm

chemistry
it is the rest of my question B. is this reaction exothermic or endothermic? C. what is the oxidizing agent in this reaction D. in corrosion reactions the oxidizing agent actually removes electrons from the oxidized substance . are electrons actually removed in combustion?explain
Thursday, September 1, 2011 at 12:41am

science
give an example from everyday life that shows that the atmosphere has substance.
Wednesday, August 31, 2011 at 8:12pm

Chemistry
Can somebody check my answers? I Failed this test one time already. I do not want to fail it again. 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed. Most often, the pair is formed A. by excess valence electrons. B. as one atom ...
Friday, August 26, 2011 at 8:40am

chemistry
The mass of the elements iron and oxygen in four samples of a rust-colored substance was measured in grams. Do you think all four samples are the same compound explain.
Wednesday, August 24, 2011 at 3:18am

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