Sunday
April 26, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Organic Chemistry
Looking down C2-C3 of 2-methylpentane, is the first newman projection staggered or eclipsed?
Wednesday, February 25, 2015 at 3:55pm

chemistry
How is the reaction quotient used to determine whether a system is at equilibrium? The reaction is at equilibrium when Q > Keq. At equilibrium, the reaction quotient is undefined. The reaction quotient must be satisfied for equilibrium to be achieved. The reaction is at ...
Wednesday, February 25, 2015 at 2:51pm

chemistry
Upon combustion, 4.30 grams sample of a compound containing only carbon, hydrogen, and oxygen produced 8.59 g of CO2 and 3.52g of H2o. what is empirical formula of the compound ?
Wednesday, February 25, 2015 at 2:32pm

Chemistry
HCl is a gas at room temperature and does not conduct electricity. Yet when dissolved in water, the solution becomes an excellent conductor. Classify HCl as metallic, ionic, molecular or covalent network, and explain why HCl would conduct electricity in an aqueous solution.
Wednesday, February 25, 2015 at 2:26pm

chemistry
I ned these classified as metallic, ionic, molecular or covalent network and two reasons why. Aluminum Ascorbic acid Graphite Paraffin Palmitic acid Sodium chloride Sucrose Water
Wednesday, February 25, 2015 at 2:26pm

chemistry
Are acids like ascorbic acid and palmitic acid ionic, molecular, or covalent network compounds
Wednesday, February 25, 2015 at 2:24pm

chemistry
Which of the following statements is not true? 1.Chemical equilibria are examples of reversible processes. 2.When multiple reaction steps are in equilibrium, then the equilibrium constant for the net reaction is the product of the individual reactions. 3.The equilibrium ...
Wednesday, February 25, 2015 at 2:21pm

Chemistry
Lets say you melted palmitic acid, paraffin, and sucrose. While they be good conductors, poor conductors, or will they not be able to conduct electricity.
Wednesday, February 25, 2015 at 2:10pm

Physical sciences(Chemistry)
Explain why the ethanoic acid have a higher boiling point than ethanol and other molecules?
Wednesday, February 25, 2015 at 1:32pm

Physical sciences(Chemistry)
Explain why ethanol has a higher boiling point than bromoethane and the hydrocarbons?
Wednesday, February 25, 2015 at 1:23pm

Chemistry
A weighed amount of sodium chloride is completely dissolved in a measured volume of 4.00 M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium bicarbonate is formed until the limiting reagent is entirely used up. The solubility of sodium ...
Wednesday, February 25, 2015 at 1:14pm

Chemistry
A dive tank is designed and built to be safe if the difference between the pressure inside the tank and the pressure outside the tank does not exceed 12 atm. A diver has the tank filled at the dive store at a temperature of 20o C to a pressure of 10 atm. The diver places the ...
Wednesday, February 25, 2015 at 1:14pm

Chemistry
pyrite, FeS2 reactswhen it is heated strongly in the air according to the equation 4 FeS2(s) + 11 O2 rightarrow 2 Fe2O3(s) + 8 SO2(g) What volume of sulfir dioxide ( measured at room temprature and pressure) would be produced by heating 100g of pyrite in excess of air Molar ...
Wednesday, February 25, 2015 at 11:49am

11th chemistry
Give reason- Ice floats on water near the melting point. Copper is ductile and malleable but brass is not. Latent heat of fusion of solid co2 is much less than that of silicone dioxide. pls ans asap...have my exams tom.
Wednesday, February 25, 2015 at 6:17am

Chemistry
Why is it that Hydrogen fluoride has a boiling point of 19 degree celsius, whereas water has a boiling point of 100 degree celsius.
Wednesday, February 25, 2015 at 2:18am

chemistry
2KClO3-2KCl+3O2 If this reaction produced 35.2 g of KCl, how much O2 was produced (in grams)?
Wednesday, February 25, 2015 at 12:25am

Chemistry
Consider the following reaction: CO(g)+H2O(g)⇌CO2(g)+H2(g) Kp=0.0611 at 2000 K A reaction mixture initially contains a CO partial pressure of 1348torr and a H2O partial pressure of 1780torr at 2000 K. Calculate the equilibrium partial pressure of CO2. Calculate the ...
Wednesday, February 25, 2015 at 12:23am

AP Chemistry
iN A LAB, the orders of two reactants, A and B, were determined experimnetally to be 2 and 3 respectively. a. write the rate law for this reaction. c. what would happen to the rate of the reaction if A were Doubled? d. what would happen to the rate of the reaction if B were ...
Tuesday, February 24, 2015 at 11:26pm

Chemistry
Consider the following chemical equation: TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l) 3.54×107g of TiCl4(g) were reacted completely and 7.91×106g of Ti(s) was obtained in the experiment. a. Calculate the theoretical yield of Ti(s). b.What is the actual yield of Ti(...
Tuesday, February 24, 2015 at 11:24pm

Chemistry
A pharmaceutical chemist Runs a chromatography test on a substance and identifies two of its components by comparing their RF values against certain standards . if the two components have RF values of 1.0 and 0.41 and the solvent front has traveled 12.0 cm from the samples ...
Tuesday, February 24, 2015 at 10:55pm

chemistry
how many moles of hydroxide ions will be needed to react with all of the acidic hydrogens in 0.6500g of KHP?
Tuesday, February 24, 2015 at 8:50pm

chemistry
How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (alternate equation: MZ=Summation N*M^3/Summation N*M^2) (Ave molar mass, mass of sample): (7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7) mili moles for repective ...
Tuesday, February 24, 2015 at 8:33pm

honors chemistry
if you obtain 10 moles of water sugar sodium chloride copper and Styrofoam will each sample have the same number of particles?
Tuesday, February 24, 2015 at 8:21pm

honors chemistry
I'm having trouble with this question in my molar mass lab. if you obtain 10 grams of water, sugar, sodium chloride, copper, and Styrofoam will each sample have the same number of particles?
Tuesday, February 24, 2015 at 8:15pm

chemistry help!!
How do I calculate the average Z molar mass, 1/n (Summation) of n*M given this data: (Ave molar mass, mass of sample): (7.5,9.6) , (12.5,8.7), (17.5, 8.9), (22.5, 5.6), (27.5, 3.1), (32.5,1.7) mili moles for repective numbers: 1.3,.7,.51,.25,.11,.052 TOTAL: 2.92 I don't ...
Tuesday, February 24, 2015 at 7:55pm

chemistry
.033597 grams of hydrogen is combined with 1.000grams of of carbon . calculate the atomic mass of hydrogen
Tuesday, February 24, 2015 at 7:09pm

Chemistry Honors
A sample of 2.0 moles of dihydrogen gas is placed in a container with a volume of 10.4 L. What is the pressure of of the gas in torr if the gas is at 25 degrees Celsius.
Tuesday, February 24, 2015 at 6:00pm

chemistry
ok i have molality is 1.05, mole fraction is 0.076, and wt% is 2.87 and solvent is C6H6 what is solute?
Tuesday, February 24, 2015 at 5:09pm

Chemistry
I have to use the given concentration of 7.03 micromoles/liters to determine the concentration for the following dilutions. 1. mL stock solution-2 mL distilled water-8 2. mL stock solution-4 mL distilled water-6 3. mL stock solution-6 mL distilled water-4
Tuesday, February 24, 2015 at 4:59pm

Chemistry 101
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.9g .What minimum mass of H2SO4 would you need? What mass of H2 gas would be ...
Tuesday, February 24, 2015 at 4:54pm

Chemistry
An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% Carbon and 5.30% H. The molar mass is determined by measuring the freezing-point depression of an aqueous solution. A freezing point of -5.20 ...
Tuesday, February 24, 2015 at 3:02pm

Chemistry
Calculate the final temperature (once the ice has melted) of a mixture made up initially of 75.0 mL liquid water at 29.0 Celsius and 7.0 g ice at 0.0 Celsius?
Tuesday, February 24, 2015 at 2:54pm

Chemistry
1.Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(ℓ) → NaOH(aq) + Cl2(g) + H2(g). If the brine contains 163 g of NaCl, how much Cl2 can be...
Tuesday, February 24, 2015 at 2:39pm

chemistry
H2So4+NH4OH Find the complete ionic equation Find the spectator ions Find the net ionic equation I feel like my answer is wrong i tried CIE: 2H+(aq)+So42-(aq)+2H4+(aq)---> 2NH4+(aq)+So42-(aq)+H2o (l)
Tuesday, February 24, 2015 at 11:24am

chemistry
H2So4+NH4OH Find the complete ionic equation Find the spectator ions Find the net ionic equation I feel like my answer is wrong i tried CIE: 2H+(aq)+So42-(aq)+2H4+(aq)---> 2NH4+(aq)+So42-(aq)+H2o (l)
Tuesday, February 24, 2015 at 11:18am

chemistry
Suppose that the reaction of Fe3+ and SCN- produces Fe(SCN)2 (+). 5.00mL of 2.0mM Fe3+ is mixed with 5.00 mL of 2.0mM SCN-. The student finds the equilibrium concentrations of Fe(SCN)2(+) to be 0.3mM. 1.) What is the initial number of moles of each species present? 2.) What is...
Monday, February 23, 2015 at 11:37pm

Chemistry
How much heat is needed to change 3kg of copper from a solid to a liquid? Heat of fusion = 205,000 J/kg
Monday, February 23, 2015 at 11:08pm

chemistry
What is the specific heat of an object that weighs 25 g and when heated to a temp of 500K and dropped into 100mL of water changes the temp of the water from room temp (293K) to 306K? Cp of water= 4.184
Monday, February 23, 2015 at 10:39pm

Chemistry
For the reaction 4FeCl2(aq) + 3O2(g) → 2Fe2O3(s) + 4Cl2(g), what volume of a 0.650 M solution of FeCl2 is required to react completely with 8.58 × 1021 molecules of O2?
Monday, February 23, 2015 at 8:40pm

chemistry
How many milliliters of 0.316 M KOH are needed to react completely with 58.0 mL of 0.297 M FeCl2 solution to precipitate Fe(OH)2? The net ionic equation is: Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s)
Monday, February 23, 2015 at 7:53pm

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6365 J. What is the specific heat of the gas?
Monday, February 23, 2015 at 7:25pm

chemistry
In a constant-pressure calorimeter, 60.0 mL of 0.310 M Ba(OH)2 was added to 60.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 23.44 °C to 27.66 °C. If the solution has the same density and specific heat as water, what is ΔH ...
Monday, February 23, 2015 at 7:25pm

Chemistry
At constant volume, the heat of combustion of a particular compound is –3949.0 kJ/mol. When 1.331 g of this compound (molar mass = 141.44 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 3.837 °C. What is the...
Monday, February 23, 2015 at 7:24pm

Chemistry
A researcher studying the nutritional value of a new candy places a 5.80-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.93 °C. If the heat capacity of the calorimeter is 38.50 kJ·K–1, ...
Monday, February 23, 2015 at 7:24pm

Chemistry
Write the rate law for the reaction, expressing k(overall) in terms of k1, k2, and k3. Step 1: UV light + Cl2(g) ⇄ 2Cl(g) Fast, Endothermic Step 2: Cl(g) + O3(g) -> OCl(g) + O2(g) Slow, Endothermic Step 3: OCl(g) + NO(g) -> NO2(g) + Cl(g) Fast, Exothermic
Monday, February 23, 2015 at 7:13pm

chemistry
sodium burns in chlorine to produce sodium chloride according to the reaction: 2Na(s) + Cl2(g) = 2NaCl(s). A student is asked to predict the mass of sodium chloride produced when 71 g of sodium is placed in a container of 200 g of chorine. The container is heated until the ...
Monday, February 23, 2015 at 5:20pm

chemistry
Ideal Mixed Gas Law problems 1. What is the pressure generated by a mixture of 25.6 g SO2 and 12.6 g Ne in a container of 72.45 L and temperature of 131 K? 2. What is the pressure of a mixture of 5.80 moles Kr and 2.71 moles Xe in a container with a volume of 205.6 Liters and ...
Monday, February 23, 2015 at 4:34pm

solution making/ chemistry/biotech
You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 3.75 by dividing 750/20 but I am not sure
Monday, February 23, 2015 at 2:55pm

Chemistry
In general, do transition metals or main group elements tend to have higher melting points? According to a article, the FeCoNi alloy tended to have a uniform structure when only Fe, Co, and Ni were included. With Al and Si, however, it had more segregation in its structure. ...
Monday, February 23, 2015 at 12:23pm

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Monday, February 23, 2015 at 9:55am

Chemistry
The density of water at 30*C is 0.9956g/mL. If the specific gravity of acetic acid is 1.040 at 30*C, what is the density of acetic acid at 30*C?
Monday, February 23, 2015 at 6:48am

CHEMISTRY
What should be observed during titration? My answer: We observe the change in color and change in turbidity of the sol'n. Am I right? Please add more things to be observed during titration. THANK YOU!
Monday, February 23, 2015 at 6:05am

CHEMISTRY
Cite three methods of analysis of a substance from a given sple by titrimetric method of analysis. My answer is: -direct method -indirect method -back titration method Is it right??
Monday, February 23, 2015 at 5:58am

chemistry
how to calculate nuclidic mass of 3He when its binding energy is 0.76 MeV
Monday, February 23, 2015 at 2:32am

chemistry
A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 2.55 atm. The partial pressure of hydrogen is 0.700 atm and the partial pressure of argon is 705 mm Hg. What is the partial pressure of helium?
Monday, February 23, 2015 at 12:22am

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Monday, February 23, 2015 at 12:12am

chemistry
Problem: Need to prepare a 250 mL buffer of pH 7.00 using equimolar K2HPO4 and KH2PO4 solutions. Ka for phosphoric acid: Ka1=7.2 x 10^-3 Ka2=6.3 x 10^-8 Ka3=4.2 x 10^-13 I though the hard part of this was picking the right equation/Ka value, but I am not getting the right ...
Sunday, February 22, 2015 at 9:03pm

Chemistry
Using household bleach and saltwater of the same molarity, describe the quantities of each that would me needed to make 30 ml of a solution that contained 50% of the hypochlorite in household bleach.
Sunday, February 22, 2015 at 8:47pm

Chemistry
A solution is prepared by dissolving of pure HC2H3O2 and of NaC2H3O2 in of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if of 0.250 M NaOH were added? (c) What would the pH be if of 0.40 M HCl were added to the ...
Sunday, February 22, 2015 at 7:48pm

chemistry
You add 8.7g of iron to 21.30mL of water and observe that the volume of iron and water together is 22.41mL . Calculate the density of iron.
Sunday, February 22, 2015 at 7:31pm

Chemistry
A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X?
Sunday, February 22, 2015 at 7:20pm

Chemistry
Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL. You will ...
Sunday, February 22, 2015 at 7:12pm

Chemistry
A 100 L reaction container is charged with 0.782 mol of NOBr, which decomposes at a certain temperature** (say between 100 and 150 oC) according to the following reaction: NOBr(g) ↔ NO(g) + 0.5Br2(g) At equilibrium the bromine concentration is 1.42x10-3 M. Calculate Kc (...
Sunday, February 22, 2015 at 7:11pm

Chemistry
A small candle with a mass of 6.0 g was completely burned. the heat produced heated 100 g of water from 23.0 to 33.0 Celsius if 200 g were heated by the same candle the temperature change of the water would be: I don't understand this question
Sunday, February 22, 2015 at 6:39pm

chemistry
An ice cube weighing 22.7 g at a temperature of 0.0°C is added to 125 mL of water at 27.1°C in an insulated container. What will be the final temperature after the ice has melted?
Sunday, February 22, 2015 at 6:36pm

Chemistry
I posted this question earlier but the person that answered did not include how to find the moles of the problem When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid ...
Sunday, February 22, 2015 at 5:28pm

Chemistry
When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I dont know how to find the moles and mass
Sunday, February 22, 2015 at 3:22pm

Chemistry
A weather balloon is inflated to a volume of 25.6L at a pressure of 736mmHg and a temperature of 31.9∘C. The balloon rises in the atmosphere to an altitude, where the pressure is 365mmHg and the temperature is -15.6∘C. Assuming the balloon can freely expand, ...
Sunday, February 22, 2015 at 3:22pm

chemistry
how do I calculate rate velocity using absorbence at 412/ min-1.
Sunday, February 22, 2015 at 3:15pm

physics/chemistry
how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
Sunday, February 22, 2015 at 2:39pm

chemistry
when 8.28g of ethanol were heated with 60g of ethanioc acid 49.74 of acid remain at equilibrium calcuma the value of k
Sunday, February 22, 2015 at 10:38am

Chemistry
When 80.0 mL of HCl is added to 80.0 mL of NH3OH, the temperature increases 2.5 celsius. Assuming the final solution has the same specific heat capacity as liquid water, the heat produced in the reaction between two solutions is: I dont get how to find the moles and mass
Sunday, February 22, 2015 at 2:32am

Chemistry
A student added some bromine (reddish orange) in some carbon tertrachloride to a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it was...
Saturday, February 21, 2015 at 11:41pm

Chemistry
A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 65.0 mL of 0.650 M NaOH were added? (c) What would the pH be if 40.0 mL ...
Saturday, February 21, 2015 at 11:32pm

chemistry
PLZ help me understand the way of solving this equation quick A 0.07 mol sample of octane C8H18 absorbed 3.5*10^3 j of energy. calculate the temperature increase of octane if the molar heat capacity of octane is 254.0 j/k*mol
Saturday, February 21, 2015 at 10:57pm

chemistry
A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it ...
Saturday, February 21, 2015 at 5:43pm

General Chemistry HELP!
Research and describe one current application of the knowledge of the atom. This application can be in any field of your choice. This means the field can be scientific, such as medicine, or nonscientific, such as entertainment. The purpose of this assignment is to learn the ...
Saturday, February 21, 2015 at 5:37pm

chemistry
Consider the following equation, which represents the combustion of hydrogen sulfide. 2H2S(g)+3O2(g)¨2SO2(g)+2H2O(g)​ What volume, in liters, of SO2 is formed when 120L of H2S(g) is burned? Assume that both gases are measured under the same conditions.
Saturday, February 21, 2015 at 4:56pm

chemistry
A dry ethene exerted a pressure of 680mmhg at 17degree celcius.what pressure would be exerted if the sample is collected over water at 17degree celcius? (s.v.p at 17degree celcius=14.0mmhg)
Saturday, February 21, 2015 at 4:52pm

chemistry
Put the following compounds in order of INCREASING oxidation number of N: N2H4, NO3-1, N2, NH3 ?
Saturday, February 21, 2015 at 4:05pm

Chemistry
(For fischer esterification) If you had collected the forerun from your distillation and tested it in the gas chromatograph, what would the most predominant compound be? -Isopentyl alcohol -Isopentyl acetate -Water -acetic acid
Saturday, February 21, 2015 at 3:25pm

chemistry
how many CO would be needed to reduce 19.1 grams of iron (III).
Saturday, February 21, 2015 at 3:16pm

Chemistry
To what volume should you dilute 124mL of an 8.10M CuCl2 solution so that 49.0mL of the diluted solution contains 4.81g CuCl2? Molar Mass of CuCl2= 134.45 g/mol Convert: 4.81g * (1mol/ 13.45g CuCl2)= 0.0358mol CuCl2 [CuCl2]= M= mol/L= (0.0358mol/ 49ml) * (1000mL/1L)= 0.7306M ...
Saturday, February 21, 2015 at 10:17am

chemistry
could one separate the components of a mixture of PbCl2 and Mg(OH)2 using only cold water?
Saturday, February 21, 2015 at 6:26am

chemistry
Two moles of an ideal gas initially at 27C and 1 atm pressure are compressed isothermally and reversibly till the final pressure of the gas is 10 atm. Calculate the work done. (R=8.314 JK-1mol-1)
Saturday, February 21, 2015 at 12:16am

Chemistry
1.Calculate the amount(in mol) in 8.80 g of carbon dioxide,Co2 2.Calculate the number of chlorine atoms in a 6.0 mg sample of anti-cancer drug cisplatin, cis-diamminedichloroplatinium(II),Pt(NH3​)2Cl2
Friday, February 20, 2015 at 11:03pm

Chemistry AP
Hey Bob, What is the pH at the point during a titration when 20 mL of 0.200 M HCl has been added to 30 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10−5 for NH3. Answer in units of pH. I've gone about getting the mmol of HCl and NH3, getting ...
Friday, February 20, 2015 at 10:30pm

Chemistry
It's January in Nashville and your local weather station just informed you that the temperature outside is -4.37 degrees Celcius. You estimate the amount of ice on your driveway to be approximately 30kg. What is the minimum amount of sodium chloride in kilograms (kg) ...
Friday, February 20, 2015 at 10:19pm

Chemistry
100 ml graduated cylinder containing 50 ml of water, drop 100g piece of brass into the water what height does the water rise in the graduated cylinder?
Friday, February 20, 2015 at 8:17pm

Chemistry
An automobile tire has a maximum rating of 38.0 psi (gauge pressure). The tire is inflated (while cold) to a volume of 11.8 Liters and a gauge pressure of 36.0 psi at a temperature of 12.0 Celsius. While driving on a hot day, the tire warms to 65.0 Celsius and it's volume ...
Friday, February 20, 2015 at 8:10pm

chemistry
Al2(SO3)3 + 6NaOH ¨ 3Na2SO3 + 2Al(OH)3 If this reaction begins with 10 g Al2(SO3)3 and 10 g NaOH, what is the theoretical yield in grams Al(OH)3 and what is the limiting reactant?
Friday, February 20, 2015 at 6:14pm

chemistry
I have questions but I don't understand this passage. Could you give a summery? Here are the question 1. One problem the researchers faced was an uncertainty about whether the signals observed in certain mass spectrometry data were, in fact, due to lead isotopes. Explain ...
Friday, February 20, 2015 at 5:05pm

Chemistry
The balanced net ionic equation resulting from addition of aqueous hydrochloric acid to solid chromium(III) hydroxide is: A. Cr(OH)3 (s) + 3 HCl (aq) 3 H2O (l) + CrCl3 (aq) B. Cr(OH)3 (s) + 3 Cl- (aq) 3 OH- (l) + CrCl3 (aq) C. Cr(OH)3 (s) + 3 H+ (aq) + 3 Cl- (aq) 3 H2O (l) + ...
Friday, February 20, 2015 at 2:50pm

Chemistry
what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
Friday, February 20, 2015 at 2:13pm

chemistry
Describe how to prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2 6H2O). Be sure to identify the labware shown above (flask and a scale), explain your reasoning, and show any calculations.
Friday, February 20, 2015 at 2:03pm

Chemistry
Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of ...
Friday, February 20, 2015 at 1:50pm

chemistry
The Russian Mir space station used a chemical oxygen generator system to make oxygen for the crew. The system ignited a tube of solid lithium perchlorate (LiClO4) to make oxygen and lithium chloride (LiCl): LiClO4 (s)  2O2 (g) + LiCl (s) If you have 500 g of LiClO4, ...
Friday, February 20, 2015 at 1:48pm

Chemistry
Use this reaction for this question: 4NH3 (g) + 2O2 (g) 4NO (g) + 6H2 (g); H = -905 J. Which statement is true about the reaction above? A. G is negative at all temperatures. B. S is negative and G is positive. C. S is negative and G is negative. D. G is positive at all ...
Friday, February 20, 2015 at 1:26pm

Chemistry
What is a molecular dipole moment? A. A separation of charge characterizing a nonpolar covalent bond B. A separation of charge forming a positive and a negative end of a molecule C. The arrangement of charges around an atom in a nonpolar molecule D. A net cancellation of ...
Friday, February 20, 2015 at 12:27pm

organic chemistry
Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with ...
Friday, February 20, 2015 at 9:17am

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