AP CHEMISTRY PRACTICE MIDTERM
TEST BANK 2026 COMPREHENSIVE
QUESTIONS AND ACCURATE
SOLUTIONS VERIFIED
◉ Which device is preferred to remove a spill of a large quantity of a
caustic chemical from clothing?
A) a safety shower
B) a fire blanket
C) an approved fire extinguisher
D) an eye-wash facility
E) an externally-vented fume hood. Answer: A
◉ A Busen burner flame is sooty black and mixed with an orange-
yellow color. Which is the probable reason for this condition?
A) No gas is mixing with the oxygen
B) Insufficient gas is mixing with the oxygen
,C) Insufficient oxygen is mixing with the gas
D) No oxygen is mixing with the gas. Answer: C
◉ Test tubes containing nonflammable fluids being heated should be
pointed at the nearest
A) ceiling
B) sink
C) floor
D) desktop
E) wall. Answer: E
◉ An object having a mass of 16.85 grams is placed into a graduated
cylinder containing water. The level of the water rose from 19.8 mL to
21.8 mL. Which density is expressed to the proper number of significant
figures?
A) 8.4
,B) 8.0
C) 8.43
D. 8
E. 8.425. Answer: A
◉ How many 100 mg tetracycline capsules can be made from 1 kg of
tetracycline?
A) 100
B) 1,000
C) 100,000
D) 10
E) 10,000. Answer: C
, ◉ A cylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon,
and 5.00 moles of helium. If the gas mixture is at STP, what is the
partial pressure of the argon?
A) 20.3 kPa
B) 50.7 kPa
C) 101 kPa
D) 30.4 kPa. Answer: D (calculate the partial pressures of each gas and
add them, as partial pressure = pressure of one gas/the sum of the
pressures multiplied by the pressure of all three gases (ex: 2.00/6.00 x
101.3))
◉ The gaseous pressure in a 500 mL flask is 250 mmHg at 284 K. What
is the number of moles of gas present in the flask?
A) 143 moles
B) 0.00143 mole
C) 7.05 moles
D) 0.00705 mole
TEST BANK 2026 COMPREHENSIVE
QUESTIONS AND ACCURATE
SOLUTIONS VERIFIED
◉ Which device is preferred to remove a spill of a large quantity of a
caustic chemical from clothing?
A) a safety shower
B) a fire blanket
C) an approved fire extinguisher
D) an eye-wash facility
E) an externally-vented fume hood. Answer: A
◉ A Busen burner flame is sooty black and mixed with an orange-
yellow color. Which is the probable reason for this condition?
A) No gas is mixing with the oxygen
B) Insufficient gas is mixing with the oxygen
,C) Insufficient oxygen is mixing with the gas
D) No oxygen is mixing with the gas. Answer: C
◉ Test tubes containing nonflammable fluids being heated should be
pointed at the nearest
A) ceiling
B) sink
C) floor
D) desktop
E) wall. Answer: E
◉ An object having a mass of 16.85 grams is placed into a graduated
cylinder containing water. The level of the water rose from 19.8 mL to
21.8 mL. Which density is expressed to the proper number of significant
figures?
A) 8.4
,B) 8.0
C) 8.43
D. 8
E. 8.425. Answer: A
◉ How many 100 mg tetracycline capsules can be made from 1 kg of
tetracycline?
A) 100
B) 1,000
C) 100,000
D) 10
E) 10,000. Answer: C
, ◉ A cylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon,
and 5.00 moles of helium. If the gas mixture is at STP, what is the
partial pressure of the argon?
A) 20.3 kPa
B) 50.7 kPa
C) 101 kPa
D) 30.4 kPa. Answer: D (calculate the partial pressures of each gas and
add them, as partial pressure = pressure of one gas/the sum of the
pressures multiplied by the pressure of all three gases (ex: 2.00/6.00 x
101.3))
◉ The gaseous pressure in a 500 mL flask is 250 mmHg at 284 K. What
is the number of moles of gas present in the flask?
A) 143 moles
B) 0.00143 mole
C) 7.05 moles
D) 0.00705 mole
