38 Answered Questions for the topic AP chem

AP chemistry electrochemistry Galvanic cell

A galvanic cell consists of a silver electrode inserted into a 1.0 M AgNO3 solution connected through a salt bridge and an external circuit to a nickel electrode inserted in a 1.0 M Ni(NO3)2... more

03/27/22

On a 7 day wilderness expedition you'll need to heat 3.0kg of water to the boiling point each day. The air temperature will average 25°C.

You have available canisters of compressed propane C3H8 fuel. Each canister has 50. g of propane in it. What is the minimum number of fuel canisters you must bring? The standard heat of formation... more

11/10/21

AP chem question

How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73g of water?Mg3N2 + 3H2O -> 2NH3 + 3MgOa) 0.114b) 0.0378c) 0.429d) 0.0756e) 4.57can someone... more

10/25/21

AP chem question

A solution of 100.0 mL of 0.200 M KOH mixed with a solution of 200.0 ml of 0.150M NiSo4.a) Write the balanced chemical equation for the reaction that occursb) What precipitate forms?c) What is the... more

10/22/21

chem question (redox)

How many electrons are being transferred in the reaction below when the reaction is balanced?(Cr2O4)^-2 + Cl^-3 -> Cr + Cl2

10/19/21

ap chem question

For each of the following write the blanched, net ionic reaction.a) Solid zinc hydroxide is sprinkled into a solution of iron (III) acetateb) A solution of cesium chloride has bromine liquid... more

Constitutional isomers

Are the following constitutional isomers?C-C-C-C-F C-C-C-C-F C-C-C-C-F C-C-C-C-F| | ... more

HELP Chemistry. energy required to heat

At 1 atm, how much energy is required to heat 53.0 g H2O(s) at −22.0 ∘C to H2O(g) at 119.0 ∘C? In KJ.

Vapor pressure of a certain liquid

A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 206.0 Torr at 45.0 ∘C.a. Calculate the value of delta H vap for this liquid.b. Calculate the normal boiling point of this liquid.

Vapor pressure of a certain substance

A certain substance has a heat of vaporization of 33.31 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than it was at 291 K?

04/17/21

2L of 0.5 M H2SO4 are needed to exactly neutralize 3 liters of NaOH of an unknown concentration.

2L of 0.5 M H2SO4 are needed to exactly neutralize 3 liters of NaOH of an unknown concentration. How do you find the concentration of the NaOH?

04/16/21

Chemistry .

If the total pressure of air is 133 kPa, what is the P O2 if it makes up 22% of the total pressure?

04/01/21

4. Magnesium is the limiting reactant in this experiment. Calculate the theoretical yield of MgO for each trial

Data Trial 1 Trial 2 Mass of empty crucible with lid 26.687g 26.696g Mass of Mg metal, crucible, and lid 27.105g 27.014g Mass of MgO, crucible, and lid  27.374g 27.218g Mass of Mg for each... more

03/18/21

Chemistry: solubility rules

According to the solubility rules, which of the following ionic compounds would form a precipitate if produced in a chemical reaction in water and why? I. NaCl II. MgCO3 III. LiOH IV. BaSO4

02/09/21

2 moles of Sodium sulfate is reacted with 3 moles of calcium chloride.  

2 moles of Sodium sulfate is reacted with 3 moles of calcium chloride.   Write a balanced chemical equation, including states of all reactants and products. Write a net ionic equation. Determine... more

01/13/21

Why is the lewis structure of H2S bent at an angle but not linear?

Why is the lewis structure of H2S bent at an angle but not linear? When I drew the lewis structure, I drew the two hydrogens at a an 180 degree angle with sulfur in the middle. How do I distinguish... more

01/12/21

Question about vapor pressure

A flask containing nothing other than air at 100.0 kPa is filled partway with water and then sealed and left to sit at 20C. The total pressure of a mixture of gases is equal to the sum of the... more

01/11/21

Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:

Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:a) HCIb) H2c) H2Od) NH3e) CCI4f) CO2e) HBr

01/09/21

plz convert these URGENT

1. How many molecules in a sample of NaClO with a mass of 3.90g. 2. 2.4g of CO2 would have how many Oxygen atoms.3. 1.63 x 10^22 molecules of CH3COONa to grams4. 3.6g AlPO4 to moles5. 2.4g Na2SO4... more

09/21/20

need help with a homework problem, very advanced

Guanine is an essential component of DNA. It contains the elements carbon, hydrogen,nitrogen and oxygen. When 615 mg of guanine is burned, 895 mg of carbon dioxide and 183 mgof water are formed. In... more

09/21/20

why do you assume 100 g of a substance when given percentages?

when given a problem and the elements of a compound are given in percentages, i don't understand why you can just assume that it's 100g of the compound. why couldn't it be 200g or 700g of the... more

09/07/20

what mass of ammonia can be synthesized from 150g of h2?

Can you please show steps as well? thank you!

09/07/20

Iron (II) sulfide contains 36.47% sulfur by mass. If 87.91 g of iron sulfide is made by reacting iron with sulfur, what mass of iron was reacted?

I really need help with this question. Can you please show steps as well? thank you!

03/30/20

thermochemistry

A sample of flammable liquid is placed into an enclosed cylinder which is then fitted with a movable piston. Initially the cylinder contains a volume of 1.60 L. The sample is ignited producing gas... more

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