Question 1

Which of the following best defines pressure in the context of chemistry?

Accepted Answer

The force exerted per unit area on the surface of an object.

Question 2

Which of the following is NOT a standard unit of pressure?

Accepted Answer

Joule (J)

Question 3

A weather report states that the atmospheric pressure is 760 mm Hg. What is this pressure in atmospheres (atm)? Use the conversion $$1\ \mathrm{atm} = 760\ \mathrm{mm\ Hg}.$$

Accepted Answer

$$1\ \mathrm{atm}$$

Question 4

Which of the following variables, when increased while others are held constant, will increase the pressure of a gas in a closed container?

Accepted Answer

Temperature

Question 5

A scuba diver's tank contains gas at a pressure of $$2.5\ \mathrm{atm}. $$What is this pressure in torr? (Use $$1\ \mathrm{atm} = 760\ \mathrm{torr})$$

Accepted Answer

$$1900\ \mathrm{torr}$$

Question 6

Which of the following equations correctly represents the mathematical definition of pressure?

Accepted Answer

$$P = \frac{F}{A}$$

Question 7

A laboratory experiment requires a pressure of $$500\ \mathrm{mm\ Hg}. $$What is this pressure in atmospheres (atm)? (Use $$1\ \mathrm{atm} = 760\ \mathrm{mm\ Hg})$$

Accepted Answer

$$0.658\ \mathrm{atm}$$

Question 8

Which of the following scenarios would result in a decrease in the pressure of a gas, assuming the amount of gas and temperature remain constant?

Accepted Answer

Increasing the volume of the container

Question 9

A tire is inflated to a pressure of $$2.00\ \mathrm{atm}. $$What is this pressure in mm Hg? (Use $$1\ \mathrm{atm} = 760\ \mathrm{mm\ Hg})$$

Accepted Answer

$$1520\ \mathrm{mm\ Hg}$$

Question 10

Which of the following is a real-life example of pressure being applied?

Accepted Answer

A syringe pushing medicine into a vein

Question 11

If the force applied to a surface is doubled while the area remains constant, what happens to the pressure?

Accepted Answer

The pressure doubles

Question 12

Which of the following statements about pressure units is correct?

Accepted Answer

1 atm is equal to 760 torr

Question 13

A gas sample is kept at constant temperature. If the volume is reduced from $$4.0\ \mathrm{L} to$$ $$2.0\ \mathrm{L}$$, what happens to the pressure?

Accepted Answer

The pressure doubles

Question 14

Which of the following is the SI unit for pressure?

Accepted Answer

Pascal (Pa)

Question 15

A hospital oxygen tank is filled to $$2280\ \mathrm{mm\ Hg}. $$What is this pressure in atmospheres (atm)? (Use $$1\ \mathrm{atm} = 760\ \mathrm{mm\ Hg})$$

Accepted Answer

$$3.00\ \mathrm{atm}$$

Question 16

Which of the following would NOT affect the pressure of a gas in a closed container?

Accepted Answer

The color of the container

Question 17

A barometer measures atmospheric pressure. If the mercury column reads $$745\ \mathrm{mm\ Hg}$$, what is the pressure in atm? (Use $$1\ \mathrm{atm} = 760\ \mathrm{mm\ Hg})$$

Accepted Answer

$$0.980\ \mathrm{atm}$$

Question 18

Which of the following best explains why a sharp knife cuts better than a dull one, in terms of pressure?

Accepted Answer

A sharp knife has a smaller area of contact, increasing the pressure for the same applied force.

Pressure: Definition, Units, Conversions, and Influencing Variables

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