638 Answered Questions for the topic AP chemistry

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.
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Ap Chemistry Science Biology Chemistry

04/19/20

What is the volume of hydrogen at a pressure of 1.06 atm if 200 cm3 of hydrogen is collected at a pressure of 1.00 atm?
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Ap Chemistry Science Biology Chemistry

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
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Ap Chemistry Science Biology Chemistry

04/18/20

Determine the volume occupied by 0.582 moles of a gas at 15°C if the pressure is 622 mmHg.
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Ap Chemistry Science Biology Chemistry

04/18/20

What is the volume of a gas at -20°C if the gas occupied 50.0 cm3 at a temperature of 0°C?
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Ap Chemistry Science Biology Chemistry

04/18/20

If a sample of a gas occupies 6.8 L at 327°C, what will be its volume at 27°C if the pressure does not change?
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Ap Chemistry Science Biology Chemistry

04/18/20

A gas sample occupies 200 mL at 760 mmHg. What volume does the gas occupy at 400 mmHg?
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Ap Chemistry Science Biology Chemistry

04/18/20

What is the volume of hydrogen at a pressure of 1.06 atm if 200 cm3 of hydrogen is collected at a pressure of 1.00 atm?
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Ap Chemistry Chemistry Chem Apchem

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.
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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).
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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?
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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.
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Ap Chemistry Science Biology Chemistry

04/02/20

According to the following balanced reaction, how many grams of NO are formed from 388 grams of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) (Please help Urgent)
Formula: 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
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Ap Chemistry Science Biology Chemistry

04/02/20

Automotive air bags inflate when sodium azide, NaN3, rapidly decomposed into N2 and Na by the following reaction: 2 NaN3 --> 2 Na + 3 N2. In order to fill an air bag, 75.0 grams of N2 must be formed.

Question: How many grams of NaN3 must react to form 75.0 grams of N2.
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Ap Chemistry Science Biology Chemistry

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)
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Ap Chemistry Science Biology Chemistry

04/02/20

According to the following balanced reaction, how many grams of NO are formed from 388 grams of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) (Please help Urgent)

Formula: 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
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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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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
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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
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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
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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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Ap Chemistry Math Science Chemistry

02/05/20

Help me with physics pls
Encke’s comet revolves around the sun in a period of just over three years. The closest it approaches the sun is 4.95 × 10^7 km, at which time its orbital speed is 2.54 × 10^5 km/h. At what... more
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02/02/20

colligative properties
OS Chapter 11 Items9. Calculate the freezing point of a solution of 400.0 g of ethylene glycol (C2H6O2) dissolved in 600.0 g of water. A) 80.0°C B) -5.5°C C) 20.0°C D) -20.0°C E) 5.5°C Kf =... more
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Ap Chemistry Math Chemistry

01/28/20

solution concentration
What is the concentration of magnesium bromide, in ppm, if 133.4 g MgBr2 dissolved in 1.84 L water. then solve for the concentration of bromide in ppm
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Ap Chemistry

01/19/20

What is electron affinity?
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