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464 Answered Questions for the topic AP chemistry

Ap Chemistry Chemistry

05/12/20

Practice question for upcoming exam!!! I did it a bunch of times and my answer keeps turning out wrong...

A solution is prepared by dissolving 10.8 g ammonium sulfatein enough water to make 100.0 mL of stock solution. A10.00-mL sample of this stock solution is added to 50.00 mLof water. Calculate the... more
Ap Chemistry Chemistry Chem

04/25/20

Titration equivlance point

Calculate the pH at the equivalence point for the titration of 4.938 M HA (a weak acid with pKa = 3.55) with 4.938 M NaOH. 
Ap Chemistry Apchem

04/25/20

Ksp solubility products

The Ksp of Fe3(PO4)2 is 4.73⋅10−20 M.Calculate the solubility of each ion in a saturated solution: 
Ap Chemistry Science Chemistry

04/25/20

Rate of reaction question

I. Increasing the temperature increases the rate of a chemical reaction BECAUSE II. the activation energy is lowered. A) I is TRUE, II is FALSE B) I is FALSE, II is TRUE C) I and II are BOTH FALSE... more
Ap Chemistry Chemistry Apchem

04/20/20

Acid and base equilibrium

OS Chapter 14 Acids and Bases Buffers and Titrations Items Determine the ammonia concentration of an aqueous solution that has a pH of 11. 00. The pKb of NH3 is 4.75. Show work.
Ap Chemistry Science Biology

04/18/20

From the volume, temperature, and pressure calculate the number of moles and the mass in grams for the gas listed below.

5.00 L SO2 at 21°C and 0.95 atm
Ap Chemistry Chemistry Chem

04/18/20

buffer system equilibrium

5. A buffered system of HC2H3O2/NaC2H3O2 by combining 20.0 mL of 0.60 M HC2H3O2 and 20.0 mL of 0.60 M NaC2H3O2. The Ka of HC2H3O2 is 1.80x10-5, pKa = 4.74.
Ap Chemistry Chemistry Chem

04/15/20

Acid/Base equilibrium calculations

How many mol of solid LiA would have to be added to 1.0 L of a 3.726 M HA solution in order to obtain a buffer of 2.99? (The Ka for HA is 5.92⋅10−6).
Ap Chemistry Chemistry Apchem

04/15/20

Acid/Base equilibrium calculations

A solution contains 0.308 M HA (Ka = 7.45⋅10−7) and 0.695 M NaA.  What is the pH of this solution after 0.192 mol of HCl are added to 1.00 L of this solution?
Ap Chemistry Chemistry Apchem

04/15/20

Acid/Base equilibrium

A 0.828 M solution of the salt NaA has a pH of 8.67. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs.
Ap Chemistry Science Biology

04/02/20

How many grams of Li3N can be formed from 12.1 grams of Li? Assume an excess of nitrogen (N2). 6 Li(s) + N2(g) → 2 Li3N(s)

Formula: 6 Li(s) + N2(g) → 2 Li3N(s)
Ap Chemistry Chemistry Ap Chem

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
Ap Chemistry Science Chemistry

03/26/20

Chemistry- I really did help

If you have 5.40grams of potassium (K) solid how many grams of potassium hydroxide (KOH) can be produced? _2__K(s) + _2__H2O(l) 🡪 _2__KOH(aq) + ___H2 (g)If 0.251moles of H2O gas are produced, how... more
Ap Chemistry Chemistry

03/24/20

Equilibrium constants

Consider the reaction below.  1.44 mol of A and 8.20 mol of B are added to a 6.0 L container.  At equilibrium, the concentration of A is 0.178 M.  What is the value of the equilibrium constant?   3... more
Ap Chemistry Chemistry

03/23/20

Equilibrium concentrartion

For Part A of the Determination of an Equilibrium Constant experiment, you will be preparing several standard solutions for the Beer's Law plot. Using the information given in Table A of the lab... more

03/21/20

(Please Help) Determination of boiling point of unknown liquid

Data:Calibration of thermometer:In ice-water system:Actual temperature, T(°C): T1: 0.0Thermometer reading, R(°C): R1 :0.2In boiling water system:Actual temperature, T(°C): T2: 100.0Thermometer... more
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