Q: Convert a pressure of 2.50 atm to kPa. Use the conversion $$1 \text{ atm} = 101.325 \text{ kPa}.$$

$$2.50 \text{ atm} \times 101.325 \text{ kPa/atm} = 253.31 \text{ kPa}$$

Q: A weather report states that the atmospheric pressure in a city is 632.4 mmHg. What is this pressure in atm? ($$1 \text{ atm} = 760 \text{ mmHg})$$

$$\frac{632.4 \text{ mmHg}}{760 \text{ mmHg/atm}} = 0.832 \text{ atm}$$

Q: A tire is inflated to a pressure of 2.00 atm. What is this pressure in torr? ($$1 \text{ atm} = 760 \text{ torr})$$

$$2.00 \text{ atm} \times 760 \text{ torr/atm} = 1520 \text{ torr}$$

Q: A laboratory experiment requires a pressure of 1.20 atm. What is this pressure in kPa? ($$1 \text{ atm} = 101.325 \text{ kPa})$$

$$1.20 \text{ atm} \times 101.325 \text{ kPa/atm} = 121.59 \text{ kPa}$$

Q: A scuba diver experiences a pressure of 2.5 atm underwater. What is this pressure in mmHg? ($$1 \text{ atm} = 760 \text{ mmHg})$$

$$2.5 \text{ atm} \times 760 \text{ mmHg/atm} = 1900 \text{ mmHg}$$

Q: Which of the following conversions is correct for pressure units?

$$1 \text{ atm} = 101.325 \text{ kPa}$$

Q: A hospital oxygen tank is filled to a pressure of 3000 psi. If $$1 \text{ atm} = 14.696 \text{ psi}$$, what is the pressure in atm?

$$\frac{3000 \text{ psi}}{14.696 \text{ psi/atm}} = 204.2 \text{ atm}$$

Question 1

Which of the following is the SI unit for pressure, and after whom is it named?

Accepted Answer

The pascal (Pa), named after Blaise Pascal

Question 2

If the same amount of gas molecules is transferred from a 5.0 L container to a 10.0 L container, what happens to the pressure (assuming constant temperature)?

Accepted Answer

It will decrease

Question 3

Which equation correctly relates pressure, force, and area?

Accepted Answer

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

Question 4

A pressure of 1 atm is equivalent to which of the following values in mmHg?

Accepted Answer

760 mmHg

Question 5

Convert a pressure of 2.50 atm to kPa. Use the conversion $$1 	ext{ atm} = 101.325 	ext{ kPa}.$$

Accepted Answer

$$2.50 	ext{ atm} 	imes 101.325 	ext{ kPa/atm} = 253.31 	ext{ kPa}$$

Question 6

A weather report states that the atmospheric pressure in a city is 632.4 mmHg. What is this pressure in atm? ($$1 	ext{ atm} = 760 	ext{ mmHg})$$

Accepted Answer

$$\frac{632.4 	ext{ mmHg}}{760 	ext{ mmHg/atm}} = 0.832 	ext{ atm}$$

Question 7

Which of the following best explains why pressure decreases when the volume of a gas increases (at constant temperature and amount)?

Accepted Answer

Gas molecules collide with the walls less frequently, reducing pressure.

Question 8

A tire is inflated to a pressure of 2.00 atm. What is this pressure in torr? ($$1 	ext{ atm} = 760 	ext{ torr})$$

Accepted Answer

$$2.00 	ext{ atm} 	imes 760 	ext{ torr/atm} = 1520 	ext{ torr}$$

Question 9

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

Accepted Answer

Joule (J)

Question 10

A laboratory experiment requires a pressure of 1.20 atm. What is this pressure in kPa? ($$1 	ext{ atm} = 101.325 	ext{ kPa})$$

Accepted Answer

$$1.20 	ext{ atm} 	imes 101.325 	ext{ kPa/atm} = 121.59 	ext{ kPa}$$

Question 11

Which of the following statements about pressure is correct?

Accepted Answer

Pressure is defined as force per unit area.

Question 12

A scuba diver experiences a pressure of 2.5 atm underwater. What is this pressure in mmHg? ($$1 	ext{ atm} = 760 	ext{ mmHg})$$

Accepted Answer

$$2.5 	ext{ atm} 	imes 760 	ext{ mmHg/atm} = 1900 	ext{ mmHg}$$

Question 13

Which of the following conversions is correct for pressure units?

Accepted Answer

$$1 	ext{ atm} = 101.325 	ext{ kPa}$$

Question 14

A hospital oxygen tank is filled to a pressure of 3000 psi. If $$1 	ext{ atm} = 14.696 	ext{ psi}$$, what is the pressure in atm?

Accepted Answer

$$\frac{3000 	ext{ psi}}{14.696 	ext{ psi/atm}} = 204.2 	ext{ atm}$$

Question 15

Which of the following best describes why atmospheric pressure is lower at higher altitudes, such as in Denver, Colorado?

Accepted Answer

There are fewer air molecules above the surface, resulting in less weight and lower pressure.

Pressure Units and Conversions in Chemistry

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