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May 25, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
rank the gases Ar, N2,CH4, and C2H6 in order of the increasing density at STP answer: CH4<N2<C2H6<Ar please help me solve this
Sunday, October 18, 2015 by Mark

Chemistry
Consider the generic reaction: 2 A(g)+ B(g)--> 2C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what will be the pressure in the flask if the reaction proceeds to completion? (Assume constant volume and temperature.) answer is 1.5atm how do you solve this
Sunday, October 18, 2015 by Mark

Chemistry!!!!!!!!
A sample of Xe takes 75 seconds to effuse out of a container. An unknown gas takes 37 seconds to effuse out of the identical container under identical conditions. What is the most likely identity of the uknown gas the answer is O2. How do you solve this?
Sunday, October 18, 2015 by Mark

Chemistry
Element X has the highest first electron affinity in its period; the ground state electron configuration of it's most common ion is [Kr] 5s^2 4d^10 5p^6 a Element Y is the second largest element in it's period; it's valence electrons are in orbital(s) that have n=6...
Sunday, October 18, 2015 by Al

Chemistry
An unknown compound contains only C, H, and O. Combustion of 4.40 g of this compound produced 10.4 g of CO2 and 2.83 g of H2O.
Sunday, October 18, 2015 by Anonymous

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Sunday, October 18, 2015 by Ash

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Sunday, October 18, 2015 by Ash

Chemistry
which gas has the greatest kinetic energy at STP? a)He b)Ne c)Ar d) None of the above(All have the same kinetic energy) how do I solve for this?
Sunday, October 18, 2015 by Mark

Chemistry
A gas sample at STP contains 1.15 oxygen and 1.55g nitrogen. What is the volume of the gas sample? the answer 2.04. I want to know how to get the that answer
Sunday, October 18, 2015 by Mark

Chemistry
Name the organic product of the following nucleophilic substitution reaction OH-+CH3I
Sunday, October 18, 2015 by Lily

College Chemistry
the acid dissociation constant for acetic acid is 1.85x10^-5. Calculate the pH at the equivalent point and the pH at one-half the equivalence point for the titration of 25.00 mL of 0.100 M acetic acid with 0.100 M NaOH?
Sunday, October 18, 2015 by Courtney

chemistry Dr. Bob
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Sunday, October 18, 2015 by patrick

chemistry-Dr Bob
is that a -56? Dr. BOb. thank you When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and...
Sunday, October 18, 2015 by patrick

chemistry
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Sunday, October 18, 2015 by patrick

Chemistry- Dr. Bob
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
which gas sample has the greatest volume at STP? a)10.0g Ar b)10.0g Kr c) 10.0 g Xe d) none of the above (They all have the same number)
Saturday, October 17, 2015 by Mark

Chemistry
A 255mL gas sample contains argon and nitrogen at a temperature of 65 degrees celsius. The total pressure of the sample is 725mmHg and the partial pressure of argon is 231 mmHg. what mass of nitrogen is present in the sample?
Saturday, October 17, 2015 by Mark

Chemistry
A gas mixture in a 1.55L at 298K container contains 10.0g Ne and 10.0g Ar. Calculate the partial pressure " in atm" of Ne and Ar in the container
Saturday, October 17, 2015 by Mark

chemistry
Use a balanced redox equation to answer the following question. 71.7 mL of 1.13 x 10-4 mol L-1 potassium ferricyanide solution is required to react completely with 43.9 mL of ascorbic acid solution (under acidic conditions). What is the concentration of the ascorbic acid ...
Saturday, October 17, 2015 by hm

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
Convert: 10 cm = ? m Convert your answer to scientific notation.
Saturday, October 17, 2015 by Anonymous

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

chemistry
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Saturday, October 17, 2015 by patrick

chemistry
is that a -56? Dr. BOb. thank you When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and...
Saturday, October 17, 2015 by patrick

Chemistry
A student dissolved 1.62 g of calcium bicarbonate into 500. mL of water. Excess amount of hydrobromic acid was then added to the solution until bubbling stopped. At STP, what approximate volume (in L) of the gaseous compound would be produced in this reaction?
Saturday, October 17, 2015 by May

Chemistry
A mixture of carbon and sulfur has a mass of 9.0 g. Complete combustion with excess O2 gives 29.7 g of a mixture of CO2 and SO2.Find the mass of sulfur in the original mixture.
Saturday, October 17, 2015 by Anonymous

chemistry
A mixture of carbon and sulfur has a mass of 9.0 g. Complete combustion with excess O2 gives 29.7 g of a mixture of CO2 and SO2.
Saturday, October 17, 2015 by Anonymous

chemistry
How can I collect carbon di-oxaide gas(CO2) from mixture of (SO2, CO, NO2, CO2) gases??
Saturday, October 17, 2015 by Mohammad Seyam

chemistry
∆H of ★Ca(HCO3)2→CaCO3 + CO2 + H2O and ★Ca(HSO4)2→ CaSO4+ SO2 + H2O???
Saturday, October 17, 2015 by Mohammad Seyam

Chemistry
What is the name of CrS subscript 3? Chromium (III) Sulfide? But S has a -2 charge... -2(3)=-6 Cancellation of the charge need to occur. I don't understand this.
Saturday, October 17, 2015 by Anonymous

chemistry
A particular air sample at 1 atm pressure has a density of approximately 1.3 g/liter and contains SO2 at a concentration of 25 µg/m3 . What is this concentration in terms of: a) Parts per million (mass SO2 per 106 units mass of air) b) Moles SO2 per 106 mol of air
Friday, October 16, 2015 by Mensah

chemistry/check my work I have to submit today
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry help DR. BOB
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
How many moles of sulfur are present in 2.9 moles of Al2(SO4)3
Friday, October 16, 2015 by shelly

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry Dr BOB
Am I correct? From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·&...
Friday, October 16, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Friday, October 16, 2015 by patrick

Chemistry
Construct a standard curve (absorbance vs. concentration) using the following results. A 5mL, 10mL, 15mL,20mL aliquot of 0.010M sodium salicylate solution was diluted to 100 mL in four different volumetric flasks with the Iron (III) chloride solution. The % Transmittance for ...
Friday, October 16, 2015 by Ati

Chemistry
Determine the amount of Sodium Salicylate required to make 100mL of a 0.01M stock solution. {this is from the spectrometric analysis of a commercial aspirin tablet lab}
Friday, October 16, 2015 by Ati

Chemistry
NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.049 M in NH4Cl at 25 °C?
Friday, October 16, 2015 by Todd Mike

Chemistry
Heating 1-bromobutane with 2M NaOH -> Butan-1-ol + NaBr Acidification with 2M HNO3 Then Addition of 0.1 AgNO3 dropwise What is the equation here? Also why does the mix need to be acidic before adding AgNO3?
Friday, October 16, 2015 by Daksh

chemistry
1.00 tonne of ammonium from the harber process is reacted with carbon dioxide to prepare the fertiliser urea and 1.35 tonnes of urea are formed. calculate the percentage yield of urea
Friday, October 16, 2015 by ellie smith

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Friday, October 16, 2015 by patrick

chemistry
flow diagram of extraction acid base organic
Friday, October 16, 2015 by Anonymous

Chemistry
A buffer is made by dissolving H3PO4 and NaH2PO4 in water. 1. Write an equation that shows how this buffer neutralizes added acid. Express your answer as a chemical equation. Identify all of the phases in your answer. 2. Write an equation that shows how this buffer neutralizes...
Friday, October 16, 2015 by Mernyshia

Organic Chemistry
When reading an infrared (IR) spectrum for an unknown compound, you check for certain functional groups in a certain order. If C=O is absent, you check for alcohols/phenols (-OH), then for amines (N-H), then for ethers (C-O, & the absence of -OH). So, I was wondering: If you ...
Friday, October 16, 2015 by Sasha

chemistry
A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 mL of 0.100 M hydrochloric acid, 100.0 mL of 0.200 M of nintric acid,500. mL of 0.0100 M calcium hydroxide, and 200.0 mL of 0.100 M rubidium ...
Thursday, October 15, 2015 by ana

Chemistry
A mixture contains 0.218 mol of Mn2O3 and 17.8 g of MnO2. 1.How many atoms of oxygen are present in the mixture? 2.How many grams of manganese are in the mixture?
Thursday, October 15, 2015 by Amy

chemistry
If 6.30 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction?
Thursday, October 15, 2015 by Natalie

Chemistry!
1. If the distance from the earth to the moon is 3.82 x 10^8 m, how many times could the paper stack reach to the MOON AND BACK? 1 mole of papers=1.505E20
Thursday, October 15, 2015 by Myles

Chemistry
Using the concentration of CH3COOH (0.8326M) and the equilibrium concentration of H3O+ (3.2x10-3), complete the reaction table for vinegar. Then calculate the acidity constant. Reaction table is given Ch3COOH + H2O --CH3COO- + H3O+ Initial. Change equilibrium
Thursday, October 15, 2015 by Danielle

Chemistry
Based solely on the amount of available carbon, how many grams of sodium oxalate, Na2C2O4, could be obtained from 175 g of C6H6? (Assume that no loss of carbon occurs in any of the reactions needed to produce the Na2C2O4.)
Thursday, October 15, 2015 by Amanda

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Thursday, October 15, 2015 by patrick

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Thursday, October 15, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Thursday, October 15, 2015 by patrick

Chemistry
4. A 9.25 g sample of sodium reacts completely with sulfur to form a compound with a weight of 15.75 g. I have no clue how to do this problem will some please explain it to me thank you
Thursday, October 15, 2015 by Brittany

Chemistry
How much KNO3 will dissolve in 200ml of water at 50 degrees Celsius?
Thursday, October 15, 2015 by Luc

joint heirs college, Fola agoro, shomolu Lagos.
CHEMISTRY (1) What is the equation for reaction when calcium oxide and coke are heated in electric furnace (2) what solid remains when the following is heated-(a) lithium trioxonitrate (v), (b) potassium trioxonitrate (v), (c) calcium trioxonitrate (v). (3) addition of water ...
Thursday, October 15, 2015 by Agunlejika Precious

Chemistry
A solution containing a mixture of 0.0381 M potassium chromate (K2CrO4) and 0.0769 M sodium oxalate (Na2C2O4) was titrated with a solution of barium chloride (BaCl2) for the purpose of separating CrO42– and C2O42– by precipitation with the Ba2 cation. Answer the ...
Thursday, October 15, 2015 by Anne

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Thursday, October 15, 2015 by patrick

chemistry
the mass of helium 4 atom is 6.64648 x 10^24 g and each of its two electrons has the mass 9.10939 x 10^-25 what fraction of the atoms mass is contributed by its nucleus?
Thursday, October 15, 2015 by jay

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Thursday, October 15, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Thursday, October 15, 2015 by patrick

chemistry
What is the change in internal energy (in J) of a system that absorbs 0.246 kJ of heat from its surroundings and has 0.771 kcal of work done on it? Is this correct? 0.246, kJ x (1000 J/1 kJ) = 246 J 0.771 kcal x (4184 J/1 kcal) =3225.86 j 246 J + 3225.86 J = 3471.86 J or 3....
Wednesday, October 14, 2015 by patrick

Chemistry
I have a metal sheet of indium, and when a uv light with a wavelength of 265 nm is shone on it the surface ejects electrons that have a kinetic energy of 8.31x10^-20 J per ejected electron. I'm asked to find the threshold frequency, I need to know how to find it.
Wednesday, October 14, 2015 by Alyssa

chemistry
Which ions are formed during electrolysis of water?
Wednesday, October 14, 2015 by sujal

chemistry
Write the differences between atom and molecules?
Wednesday, October 14, 2015 by sujal

chemistry
Name a lustrous non metal?
Wednesday, October 14, 2015 by sujal

chemistry
Copper plate can be used as cathode but it cannot be used as anode in electrolysis of water,why?
Wednesday, October 14, 2015 by sujal

chemistry
How are ions formed?
Wednesday, October 14, 2015 by sujal

chemistry
Name a metal which is found in liquid state at ordinary temperature?
Wednesday, October 14, 2015 by sujal

Chemistry
A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 827 J of heat from its surroundings and has 0.66 kJ of P−V work done on it by its surroundings. ...
Wednesday, October 14, 2015 by Tanner

CHEMISTRY!
Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation for this is S2 (g) + C (s) <---> CS2 (g) Kc = 9.40 at 900 K How many grams of CS2 (g) can be prepared by heating 11.7 moles of S2 (g) with excess carbon in a 5.95 L reaction vessel at 900 ...
Wednesday, October 14, 2015 by cal

chemistry
Acid is required for calcium carbonate to fully dissociate. Determine the volume of 6M hydrochloric acid that must be added to dissolve the mass of CaCO3 you calculated in the question above taking into consideration the equations below. CaCO3->Ca+CO2 2H+CO2->H2CO3->...
Wednesday, October 14, 2015 by Jennifer

chemistry
What is the mass of mercury that can be prepared from 2.00 g of cobalt metal? Co(s)+HgCl2(aq)→CoCl3(aq)+Hg(l)
Wednesday, October 14, 2015 by Benita

Chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 mL of a solution that has a concentration of Na+ ions of 0.600 M ?
Wednesday, October 14, 2015 by Lo

chemistry
Am I correct? Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is: 4Fe(s)+3O2(g) --> ...
Wednesday, October 14, 2015 by patrick

Chemistry
A 0.179 g sample of a vitamin C tablet was titrated with 0.1000 M NaOH according to the procedure in this experiment. The titration required 7.08 mL of NaOH solution. How many moles of NaOH were used in the titration? How Many moles of Vitamin C were in the sample? What was ...
Wednesday, October 14, 2015 by Anonymous

Chemistry
Using the van der Waals equation, calculate the pressure (in atmospheres) exerted by 91.14 g of Cl2 at 91.11 °C in a 1.00 L container. The van der Waals constants for Cl2 are a = 6.490 L2*atm/mol2 and b = 0.05620 L/mol.
Wednesday, October 14, 2015 by Help123

General Chemistry
A 0.179 g sample of a vitamin C tablet was titrated with 0.1000 M NaOH according to the procedure in this experiment. The titration required 7.08 mL of NaOH solution. How many moles of NaOH were used in the titration?
Wednesday, October 14, 2015 by Alex

Chemistry
We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...
Wednesday, October 14, 2015 by Alexandra

Chemistry: Equilibrium
So, I think I'm doing everything right and even checking my math, but it keeps showing up as wrong. If someone can help me and go into detail,including the quadratic formula, I would appreciate it: Phosphorus pentachloride decomposes according to the chemical equation Pcl5...
Wednesday, October 14, 2015 by Jessica

Chemistry
Two separate flasks are each filled with a gas at 25.0°C; the valve between them is opened and the gases are allowed to mix. What would be the final pressure in torr after mixing, if initially H2 is in the first flask (Volume = 4.000 L) at 271.8 torr and CCl4 is in the ...
Wednesday, October 14, 2015 by Help123

Chemistry
We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...
Wednesday, October 14, 2015 by Alex

Chemistry
What would be the equation for NaOH + H2SO4 be? Would the porducts be H2O + NaHSo4 or H2O + Na2SO4? If it's the second one, which I think it is, where does that extra H go?
Tuesday, October 13, 2015 by Macy

chemistry
What are diatomic elements?
Tuesday, October 13, 2015 by sujal

chemistry
Use kinetic molecular theory to explain why approximating ideal behavior (PV=nRT) is fairly accurate only at low pressures and high temperatures. Use several concepts of kinetic molecular theory, not just math, to explain.
Tuesday, October 13, 2015 by Lay

chemistry
It was found that argon effused through a membrane in 24 hours, and an unknown gas diffused through the same membrane in 22.1 hours. What was the molecular weight of the gas?
Tuesday, October 13, 2015 by Lay

chemistry
Current can pass through salt solution but not through sugar solution ,why?
Tuesday, October 13, 2015 by sujal

chemistry
The density of an elemental gas is 2.14 kg/m3 at STP. What is its approximate molecular weight?
Tuesday, October 13, 2015 by Lay

chemistry
Electrolysis of water produces hydrogen gas and oxygen gas, which can be collected over water: 2H2O(l) → 2H2(g) + O2(g) An electrolysis reaction at 735 mmHg pressure produced 25.00L of gas at 25°C; at which point, the vapor pressure of water is 23.76 torr. How many ...
Tuesday, October 13, 2015 by Lay

chemistry
A balloon is filled to 1.000L at the bottom of the Marianas Trench, where the pressure exerted on it is 1065 atm and the temperature is 2°C, and taken to Columbus, where the pressure is 0.967 atm and the temperature is 30.00°C. What is its new volume?
Tuesday, October 13, 2015 by Lay

Chemistry
A sample of nitrogen gas is collected over water at a temperature of 23 degrees C. What is the pressure of the nitrogen gas if the atmospheric pressure is 795 mm HG? Anser in units of mm Hg.
Tuesday, October 13, 2015 by Lisa

Chemistry
what is the minimum mass of ice at 0.0C that must be added to 1.00kg of water to cool the water from 25.0C to 12.0C. the heat of fusion is 333J/g; specific heat capacities of ice = 2.06J/gK; the heat capacity of water is 4.184J/gK. I have no clue where to start.
Tuesday, October 13, 2015 by Michala

Chemistry
If 46.1 g Cu at 11.6 C is placed in 85.0 g H2O at 72.4 C, what is the final temperature of the mixture? (specific heat capacities: Cu: 0.385 J/gK Water: 4.184 J/gK)?
Tuesday, October 13, 2015 by Michala

Chemistry
Acetone is an important chemical solvent and is used at homes as a nail polish remover. Chemical analysis shows that acetone is 62.0%C, 10.4%H, and 27.5%O by mass. A. Determine the empirical formula of acetone. B. In a separate experiment, the molecular mass is found to b 58.1...
Tuesday, October 13, 2015 by Anonymous

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