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AP Chemistry Unit 3 Properties of Substances and Mixtures

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About this Exam

Prepare with the AP Chemistry Unit 3 Properties of Substances and Mixtures practice quiz. This question bank includes 17 questions covering flask, pressure, hydrogen, water, and mass. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
At STP a 5.00 L flask filled with air has a mass of 543.251 g. The air in the flask is replaced with another gas, and the mass of the flask is then determined to be 566.107 g. The density of air is 1.290 g L −1 . What is the gas that replaced the air?
Only a small fraction of all molecules of this substance has enough kinetic energy to escape into the gas phase.
large volume, increased temperature
When the vapor is condensed, the liquid burns easily.
Xe
Explanation:
Correct answer: Xe
Question 2
Hydrogen gas can be prepared by the addition of hydrochloric acid to a sample of zinc. Upon completion of the reaction, 195 mL of gas were collected by water displacement at 25 °C and 753 torr. What mass of the hydrogen gas was collected? P water = 24 torr at 25 °C.
1.0154 g
0.0154 g
-0.9846 g
0.0308 g
Explanation:
Correct answer: 0.0154 g
Question 3
At 30 °C a sample of hydrogen is collected over water (P H2O = 31.82 mm Hg at 30 °C) in a 500 mL flask. The total pressure in the collection flask is 745 mm Hg. What will be the percent of error in the amount of hydrogen reported if the correction for the vapor pressure of water is not made?
0.278 moles
0.0154 g
5.0 atm
+4.5%
Explanation:
Correct answer: +4.5%
Question 4
How many moles of helium are needed to fill a balloon that has a volume of 6.45 L and a pressure of 800 mm Hg at a room temperature of 24 °C? Assume ideal gas behavior.
0.278 moles
1.278 moles
-0.722 moles
0.556 moles
Explanation:
Correct answer: 0.278 moles
Question 5
A gas will behave more like an ideal gas if we have a _________ and a(n) ______________.
large volume, increased temperature
Only a small fraction of all molecules of this substance has enough kinetic energy to escape into the gas phase.
The heat of fusion is less than the heat of vaporization.
The specific heat can be determined if the mass is known.
Explanation:
Correct answer: large volume, increased temperature

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Additional Information

AP Chemistry Unit 3 Properties of Substances and Mixtures

This practice set contains 17 questions from the matching question bank and focuses on flask, pressure, hydrogen, water, and mass. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 17 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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