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September 3, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry - Thermodynamics
A piece of metal of mass 12 g at 104◦C is placed in a calorimeter containing 45.4 g of water at 22◦C. The final temperature of the mixture is 71.5 ◦C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the ...
Wednesday, January 22, 2014 at 9:02pm

chemistry
What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.
Wednesday, January 22, 2014 at 7:12pm

chemistry
What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.
Wednesday, January 22, 2014 at 7:11pm

chemistry
The rate constant,K, for a given was determined at a number of temperatures. A graph of log K versus the reciprocal of the kelvin temperature yielded a straight line with a slope of -250 K. What is the activation energy of this reaction in Kj/mol? For this question I got 2....
Wednesday, January 22, 2014 at 3:59pm

Chemistry
Balance KCLO3 ---> KCl + O2
Wednesday, January 22, 2014 at 3:37pm

Chemistry
1. How do you that these react? If they do, what are the products? How do you do this? i.) F^- + Br2----> ii.) Br^- + Cl2-----> 2. Explain why boiling point increases from S to Se to Te.... 3. What is the electron configuration and arrangement of Fe^3+? How is this ...
Wednesday, January 22, 2014 at 1:09am

AP Chemistry
The pH of a solution of hydrochloric acid is 1.67. What is the molarity of the acid? Answer in units of mol/L
Tuesday, January 21, 2014 at 6:44pm

Chemistry Help Please!
An industrial chemist puts 1.00 mol each of H2(g) and CO2(g) in a 1.00-L container at 800oC. When equilibrium is established, 0.49 mol of CO(g) is in the container. Find Kc at 800 C for the following reaction: H2(g) + CO2(g) ⇌ H2O(g) + CO(g).
Tuesday, January 21, 2014 at 2:50pm

Chemistry Help Please!
SHOW WORK PLEASE SO I CAN DO THE REST OF MY HW BY LOOKING AT THIS QUESTION. The decomposition of hydrogen peroxide is catalyzed by iodide ion. The catalyzed reaction is thought to proceed by a two-step mechanism: 1. H2O2(aq) + I(aq) → H2O(l) + IO(aq) (slow)  &#...
Tuesday, January 21, 2014 at 2:01pm

Chemistry
Write chemical formula (complete with reactants), balance. ammonium sulfide + aluminum phosphate
Tuesday, January 21, 2014 at 4:55am

Chemistry
To neutralize a 0.5192 g organic acid, 44.0 mL NaOH solution (1.00 ml ~ 1.12 mL HCl ~ 0.0100 g CaCO3) is required. What is the equivalent weight of the organic acid?
Tuesday, January 21, 2014 at 4:17am

Chemistry
What will be the volume of concentrated H2SO4 that must be added to 155 mL of 0.1996 N H2SO4 in a 500 mL volumetric flask so that the resulting solution will be 6.5210 M? pls. explain.
Tuesday, January 21, 2014 at 4:07am

Chemistry
Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is the following. Cr2O3(s) + 2 Al(s) → 2 Cr(l) + Al2O3(s) What masses of chromium(III) oxide and aluminum must be ...
Tuesday, January 21, 2014 at 3:26am

Chemistry
Calculate the volume of 2.503 N HNO3 added to 100 mL of HCl in order to prepare 1.1251 N acid solution from the following data: 58.96 mL NaOH will neutralize 2.521g of potassium tetroxalate and 45.57 mL of HCl will neutralize 53.0 mL of the NaOH solution.
Tuesday, January 21, 2014 at 3:11am

chemistry
A mixture containing 50grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is massed. What is the mass of the sealed flask? A) 125 grams B) 150 ...
Monday, January 20, 2014 at 8:29pm

chemistry
Which 2 types of steel appeared to have their properties combined in tempered steel
Monday, January 20, 2014 at 6:09pm

Chemistry
A sample of nitrogen gas is confined in a 8.494 L container at 2.643 x 102 torr and 50 oC. How many moles of gas are present in the sample? So I thought I set this problem up right and when I type the answer into CALM my answer is incorrect. This is what I did: PV=nRT (2.643 x...
Monday, January 20, 2014 at 4:50pm

chemistry
Diagram for the preparation of oxygen from potassium trioxochloric(v)
Monday, January 20, 2014 at 2:24pm

Chemistry
For example, when a question asks about two equivalents of bromine, does that mean Br2 OR 2Br2? Thanks
Monday, January 20, 2014 at 2:18pm

Chemistry
Calculate the % Na2CO3 and % BaCO3 in a 0.2005g sample which requires 28.0mL of 0.9990 N acid for complete neutralization.
Monday, January 20, 2014 at 2:36am

Chemistry
To what volume must 1580mL of 0.2005 N solution be diluted so that the resulting solution will be 0.1899 M? How much water will be needed in the dilution?
Monday, January 20, 2014 at 2:33am

Chemistry
I have been researching, but I find no reliable sources. I want to check with you if these are true.... Are we actually not touching the ground due to the repulsion of the electron clouds between our feet and the ground? Same with the clothes we wear and our body?? Are we not ...
Monday, January 20, 2014 at 12:51am

Chemistry
What is molecular mass of CuSO4(NH4)SO4.H2O
Sunday, January 19, 2014 at 11:01pm

AP Chemistry
What is the mass percent of acetic acid in 3.25 molality of CH3COOH?
Sunday, January 19, 2014 at 10:10pm

chemistry
In a combustion reaction, propane (C3H8) reacts with oxygen. How many moles of CO2 can be produced when 2.25 mol of C3H8 react? C3H8(g) + 5O2(g) -„³ƒn3CO2(g) + 4H2O(g)
Sunday, January 19, 2014 at 7:24pm

Chemistry
Calculate the pH of the solution formed by adding 15.0ml of 0.1M sodium hydroxide to 30.0ml of 0.1M propanoic acid.
Sunday, January 19, 2014 at 6:33pm

AP Chemistry
Why would .25 molality of CaCl2 have a larger effect on the freezing point of water than .25 molality of NaCl?
Sunday, January 19, 2014 at 5:50pm

Chemistry
A 0.2299 N acid is prepared by mixing 100 ml of 0.1234 N H2SO4 and 0.3200 N HCl. How much HCl is needed in the preparation of the solution?
Sunday, January 19, 2014 at 2:14am

chemistry who helps me for me
A 0.887g sample of a mixture of nacl and kcl is dissolved in water , and the solution is then treated with an excess of agn03 to yield 1.913g of agcl. Calculate the percent by mass of nacl in the mixture 1.913/143g/mol = 0.01337 who helps me
Saturday, January 18, 2014 at 11:46pm

chemistry Who clearlyexplain step by step
1g of mixture na2c03 and k2c03 was made upto 250ml is aqueous solution. 25ml of this solution was neutralized 20ml of hcl of unknown concentration. The neutralized solution requires 16.24ml of 0.1N agn03 for precipitation Calculate A) the k2c03 is mixture b) conc of hcl in g/L...
Saturday, January 18, 2014 at 11:11pm

chemistry Who helps step by step
0.887g sample of a mixture of nacl and kcl is dissolved in water. The solution is then treated with an excess agn03 to yield 1.1930of agn03. Calculate the percent by mass of each compound in the mixture agcl = 143g/mol 1.1930/143 = 0.001337 m agcl x/58g/mol + (0.8870g -x) + y/...
Saturday, January 18, 2014 at 1:20pm

Chemistry
Calculate the volume of oxygen at 27C and 740 mmHg which could be obtained by hesting 10g of potassium trioxochlorate (v)
Saturday, January 18, 2014 at 9:30am

chemistry
In a reaction A to products, ,4.40 min after the reaction is started concentration of A is 0.588M. The rate of reaction at this point is rate= -change in concentration of A/change in time=2.2x10^-2Mmin^-1. Assume that this rate remains constant for a short period of time. A. ...
Saturday, January 18, 2014 at 2:07am

Chemistry
Is esterification a condensation reaction?
Saturday, January 18, 2014 at 1:04am

Chemistry
Is esterification a condensation reaction?
Saturday, January 18, 2014 at 1:04am

Chemistry
Which gas diffuses most rapidly at STP? Ar, Kr, N2, or O2? Why?
Friday, January 17, 2014 at 9:39pm

Chemistry
Hey can anyone help me solve these questions 1. Balance K2Cr2O7 +H2C2O42H2O --> K[Cr(CrC2O4)2(H2O)2]2H2O +CO2+ H2O 2. Calculate the theoretical yield of the reaction mentioned above 3.What is the theoretical percentage by weight of Cr in the reaction mentioned above 4. Why ...
Friday, January 17, 2014 at 9:21pm

Chemistry
Which of the following must be the same before and after a chemical reaction? Answer: The sum of the masses of all substances involved and the number of atoms of each type involved. WHY?
Friday, January 17, 2014 at 3:06pm

Chemistry
Assume a baker of pure water has been boiling for 30 minutes. What is in the bubbles in the boiling water? Answer: water vapor. WHY?
Friday, January 17, 2014 at 3:05pm

Chemistry
Heat is given off when hydrogen burns in air according to the equation: 2H2 + O2 ---> 2H2) What is responsible for the heat? I know the answer is froming hydrogen-oxygen bonds gives off energy, but why?
Friday, January 17, 2014 at 3:00pm

Chemistry
Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs: I know the answer is the rust should way more than the nail it came from but can someone explain why please!
Friday, January 17, 2014 at 2:44pm

chemistry
How many moles of protons are present in 7.54 grams of Rubidium? Report your answer to 3 significant figures.
Friday, January 17, 2014 at 1:32pm

Chemistry
If you add 4.6 g of sodium to water, how many molecules of H2 will be formed? (4points) 2Na(s)+2H2O(l)-->2NaOH(aq)+H2(g)
Friday, January 17, 2014 at 11:34am

Chemistry Check Please! ?Fixed
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.548 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
Friday, January 17, 2014 at 2:52am

chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
Thursday, January 16, 2014 at 11:33pm

chemistry
how many grams of CH4 (methane) must be burned to form 82.6g of H2O? equation: CH4+O2----> CO2+H2O
Thursday, January 16, 2014 at 9:13pm

chemistry
A sulfuric acid solution containing 571.8gg of H2SO4 per liter of solution has a density of 1.329 g/cm3 Calculate the mole fraction of H2SO4 in this solution.
Thursday, January 16, 2014 at 5:26pm

chemistry
The best means of personal protection from radiation for emergency responders is the implementation of three basic principles: time, distance and shielding. Please show your work when answering the following questions: a. Using the inverse square law of radiation, what Geiger ...
Thursday, January 16, 2014 at 4:53pm

chemistry
A student finds a rock on the way to school. In the laboratory he determines that the volume of the rock is 29.7 cm3, and the mass in 139.943 g. What is the density of the rock?
Thursday, January 16, 2014 at 9:41am

Chemistry Check Please!
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
Thursday, January 16, 2014 at 1:19am

Chemistry
When a student doesn't polish a sample of Mg ribbon before massing it, what happens when calculating the molar volume? Is it that the Mg ribbon doesn't completely react therefore less volumes of gas are produced?
Wednesday, January 15, 2014 at 11:58pm

Chemistry
Calculate (in calories) the amount of heat needed to melt 96g of ice at -24 degrees C to water at 28 degrees C.
Wednesday, January 15, 2014 at 8:23pm

Chemistry
A weightlifter manages to lift a 133 kg (that's 293 pounds, which sounds much more impressive) weight a distance of 1.4 m. How many kcal of heat energy is equivalent to this lift?
Wednesday, January 15, 2014 at 6:01pm

Chemistry
A certain substance has a heat of vaporization of 26.49 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 285 K?
Wednesday, January 15, 2014 at 1:49pm

Chemistry
1. Calculate the decrease in temperature when 6.00 L at 20.0 °C is compressed to 4.00 L. 2. A container containing 5.00 L of a gas is collected at 100 K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure (as ...
Wednesday, January 15, 2014 at 4:01am

Chemistry
1. If 22.5 L of nitrogen at 748 mm Hg are compressed to 725 mm Hg at constant temperature. What is the new volume? 2. A gas with a volume of 4.0L at a pressure of 205kPa is allowed to expand to a volume of 12.0L. What is the pressure in the container if the temperature remains...
Wednesday, January 15, 2014 at 3:55am

Chemistry
What is the uncertainty of the concentration...0.00001? Please explain how ... Would the uncertainty be the same or different for 0.01?
Tuesday, January 14, 2014 at 11:32pm

Chemistry
What is uncertainty and how can I calculate it ? For example, 0.001 +/- ?
Tuesday, January 14, 2014 at 11:26pm

Chemistry (My previous post lacked something)
Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. The question is in 4 parts. I just need the first: a)What mass of oxygen is necessary for this reaction? So far I've got 2.15 L x 1 mole /22.4 L But when I try to do the mole ratio, ...
Tuesday, January 14, 2014 at 11:10pm

Chemistry
So I have the balanced equation: c3H8 +502 = 3C02 +4H20 Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. So I've got 2.15 L x 1 mole /22.4 L But when I try to do the mole ratio, I don't know what to do since the 2.15 L is of ...
Tuesday, January 14, 2014 at 10:42pm

Chemistry
When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 290.5 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What is the chemical ...
Tuesday, January 14, 2014 at 10:25pm

Chemistry
How might fragrance designers benefit from an understanding of how the shape of an odorant stimuilates a receptor? PLEASE!!! I'm completeing another C^3 assignment and its due tomorrow so i could really use the help!
Monday, January 13, 2014 at 11:49pm

CHEMISTRY
HOW CAN I WRITE UNCERTAINTY FOR CONCENTRATION? EXAMPLE: 0.0001 M +/- ? PLEASE EXPLAIN WHY....AND IS IT DIFFERENT FOR EACH CONCENTRATION? THAT IS WHAT ABOUT 0.00001 M? 0.01M?
Monday, January 13, 2014 at 11:34pm

Chemistry
What mass of AgN03 would you dissolve in water to get 1g of silver?
Monday, January 13, 2014 at 8:48pm

chemistry
You are tasked with preparing a 500mL nutrient solution containing 5mg/L of phosphorous (P), 3mg/L nitrate (NO3 -) and 100 mg/L chloride (Cl-). To make this solution, you have powdered sodium chloride, a 100 mg/L solution of phosphorus, a 1000 mg/L of sodium nitrate (NaNO3) ...
Monday, January 13, 2014 at 4:57pm

analytical chemistry
What are the advantages of using graphical endpoint(potentiometric endpoint) compared to usual endpoint(chemical indicator)
Monday, January 13, 2014 at 12:10pm

Chemistry Damon step bystep for me
A 0.887g sample of a mixture of nacl and kcl is dissolved in water and the solution is treated with an excess of agn03 producing 1.822g of agcl. What is the percent by mas of each compound in the mixture My calculation 1.822g/143g/mol = 0.013M x/58 + y/74 (0.887g-x) = 0.013M I...
Sunday, January 12, 2014 at 4:28pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid I know it is hard to DRAW online, but still you can do something like this... CH-...
Sunday, January 12, 2014 at 2:52pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Sunday, January 12, 2014 at 2:49pm

Chemistry Damon step by step for me
you are given a solid that is a mixture of na2s04 and k2s04. A 0.215g sample of the mixture is dissolved in water. An excess of an aqueous solution of bacl2 is added. The bas04 that is formed is filtered, dried and weighed. Its mass is 0.299g. What mass of s04 ion is in the ...
Sunday, January 12, 2014 at 2:42pm

Chemistry Damon
1g of mixture of na2c03 and k2c03 was made upto 250ml is aqueous solution . 25ml of this solution was neutralized 20ml of hcl of unknow concentration. The neutralized solution required 16.24ml of 0.1N AGN03 for precipitation. Calculate a) the k2c03 is mixture b) conc of hcl in...
Sunday, January 12, 2014 at 1:04pm

chemistry Damon helps me step by step
1g of mixture na2c03 and k2c03 was mole made upto 250ml is aqueous solution. 25ml of this solution was neutralized. 20ml of hcl of unknown concentration. The neutralized solution required 16.24ml of 0.1N AGNo3 for precipitation, Calculate a) the % k2c03 is mixture b) conc of ...
Sunday, January 12, 2014 at 11:43am

Chemistry
Which method(High Performance Liquid Chromatography or Gas Liquid Chromatography) would be suitable for the separation of the following mixtures? 1) Mixture of paracetamol, codeine and caffeine. 2) Mixture of alpha-pinene, beta-pinene, eucalyptol, alpha-terpineol. Please ...
Sunday, January 12, 2014 at 12:33am

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Sunday, January 12, 2014 at 12:30am

Chemistry
25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculate the percentage of f2s04 7h20 in the sample 1 g of mixture of ...
Saturday, January 11, 2014 at 11:48pm

Chemistry
How is the high performance liquid chromatography column designed to ensure greater efficiency?
Saturday, January 11, 2014 at 11:19pm

Chemistry
Draw condensed structural formula for... 2,3-dichloropropanoic acid
Saturday, January 11, 2014 at 11:15pm

chemistry who helps me step by step
25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. calculate the percentage of fe204 7h20 in the sample. My calculation 0.02x...
Saturday, January 11, 2014 at 8:10pm

Chemistry
Assuming that seawater has a total ion concentration (aka colligative molarity) of 1.10 M conc, calculate how many liters of seawater are needed to produce 68.7 L of fresh water at 20 C with an applied pressure of 51.0 bar.
Saturday, January 11, 2014 at 2:19pm

Chemistry
What would be the temperature change if 3.0g of water absorbed 15J of heat?
Saturday, January 11, 2014 at 2:04pm

Chemistry
How can reaction intermediates in an organic synthesis be separated and recovered using thin layer chromatography?
Saturday, January 11, 2014 at 9:39am

Chemistry
Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?
Friday, January 10, 2014 at 5:58pm

chemistry
Automotive air bags inflate when sodium azide, NaN3, rapidly decomposes to its component elements: 2NaN3(s)→2Na(s)+3N2(g) a)How many moles of N2 are produced by the decomposition of 1.60mol of NaN3? b)How many grams of NaN3 are required to form 14.0g of nitrogen gas? c)...
Friday, January 10, 2014 at 5:10pm

Chemistry
How would you define pressure in the unit of thermodynamics? Is it just a force basically?
Friday, January 10, 2014 at 12:21am

AP Chemistry
The ionic substance T3U2 ionizes to form T2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of the solubility-product constant?
Thursday, January 9, 2014 at 5:56pm

AP Chemistry
What is the value of Ksp for Ag2SO4 if 5.70 g is soluble in 1.00 L of water?
Thursday, January 9, 2014 at 5:47pm

Chemistry/Math
The density of water is 1 g/cm^3. What is the mass of 7.500 liters of water reported in kilograms? I got 7.5kg. Is this correct?
Wednesday, January 8, 2014 at 9:32pm

chemistry
Please explain, in simple English, why is milk a colloid?
Wednesday, January 8, 2014 at 7:30pm

AP Chemistry
Calculate the solubility product constant for calcium carbonate, given that it has a solubility of 5.3×10^7 g/L of water.
Wednesday, January 8, 2014 at 6:19pm

AP Chemistry
A solution of AgI contains 1.2 mol/L Ag+. Ksp of AgI is 8.3×10^17. What is the maximum I− concentration that can exist in this solution? Answer in units of mol/L
Wednesday, January 8, 2014 at 6:17pm

AP Chemistry
Calculate the concentration of Hg2+ ions in a saturated solution of HgS(s). (Ksp=1.7×10^52) Answer in units of mol/L What volume of solution contains one Hg2+ ion? Answer in units of L/ion
Wednesday, January 8, 2014 at 6:14pm

chemistry
1. describe in outline a suitable procedure for the preparation of saturated solution of sodium nitrate at 30 degree celsius 2. State 2 techniques that can be used to recover crystals of the sodium nitrate from its saturated solution
Wednesday, January 8, 2014 at 8:40am

Chemistry
139 g of water at 4.9 degrees Celsius mixed with 241 g of water at 96.0 degrees Celsius (Tf=62.7)
Wednesday, January 8, 2014 at 1:04am

Chemistry
139 g of water at 4.9 degrees Celsius mixed with 241 g of water at 96.0 degrees Celsius (Tf=62.7)
Wednesday, January 8, 2014 at 1:03am

Chemistry
How do I write a blog for my chemistry project?
Tuesday, January 7, 2014 at 9:08pm

chemistry
A ternary ionic compound consists of a monoatomic ion plus a cation? true or false.
Tuesday, January 7, 2014 at 9:21am

Chemistry
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 10:34pm

CHEMISTRY
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 8:55pm

Chemistry
The answeres to the previous post was not what I am looking for...so please try to help me..... How can I make various concentrations of CuSO4(this is a blue solution)? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then ...
Monday, January 6, 2014 at 7:34pm

Chemistry
How can I make various concentrations of CuSO4? I know that to make 0.1M you would fill the copper solution up to 10mL in the graduated cylinder and then add water to the rest..but how can you prepare a 0.01M? 0.001? 0.0001?..........using water and graduated cylinder?
Monday, January 6, 2014 at 7:05pm

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