Chemistry 1 - Amazon Web Services

[Pages:12]Chemistry 1

Volume 5

Worksheet 1 The Pressure of a Gas

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Conversion factors:

1 atm =

760 mmHg 760 Torr 14.696 lb/in2 101,325 N/m2 101,325 Pa 1.01325 bar 29.921 inHg

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1. Which of the following are necessary to calculate pressure? a. Area and force b. Force and mass c. Mass and area d. Volume and force

2. Which of the following is not a valid unit of pressure? a. N/m2 b. lb/in2 c. N/m d. N/cm2

3. What are the SI base units of pressure? a. N/m2 b. N/cm2 c. kg/m s2 d. 1 atm

4. Which of the following is the correct conversion between 1 atm and mmHg? a. 760 atm = 1 mmHg b. 1 atm = - 760 mmHg c. 1 atm = 760 mmHg d. 0.5 atm = 760 mmHg

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5. Which of the following is the correct relation between 1 mmHg and Torr? a. 1 mmHg = 1 Torr b. 1 mmHg = 760 Torr c. 760 mmHg = 1 Torr d. 2 Torr = 1 mmHg

6. Convert 1.6 atm to mmHg.

7. Convert 746 Torr to atm.

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8. Convert 834 Torr to mmHg.

9. Convert 5.0 mbar to Torr.

10. If a force of 5 N was applied over an area of 5 cm2, what is the pressure, in bar? 5

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11. Challenge: If a pressure of 0.35 bar was exerted by a force of 5.0 N, what was the area, in cm2, that the force was applied to?

12. Challenge: If a pressure of 773 mmHg is applied to an area of 5.4 in2, what force was applied?

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Answer Key

1. Which of the following are necessary to calculate pressure? a. Area and force b. Force and mass c. Mass and area d. Volume and force

Pressure is defined as the force exerted over a given area. It has the formula:

=

where F is the force, and A is the area.

Correct answer: a. Area and force

2. Which of the following is not a valid unit of pressure? a. N/m2 b. lb/in2 c. N/m d. N/cm2

Remember: pressure is defined as the force per unit area. Therefore, any unit used to describe pressure must have base units that include both a force and an area. In c, while there is a unit of force (N), m (meter) is merely a unit of length.

Correct answer: c. N/m

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3. What are the SI base units of pressure? a. N/m2 b. N/cm2 c. kg/m s2 d. 1 atm

While N/m2 is a valid unit of pressure, it does not include the base units of pressure. There are seven SI base units (meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd)). 1 N is equal to 1 kg m/s2. Thus, ! = !!

Since there is an m in both the numerator and the denominator, they cancel out. !

Correct answer: c. kg/m s2

4. Which of the following is the correct conversion between 1 atm and mmHg? a. 760 atm = 1 mmHg b. 1 atm = - 760 mmHg c. 1 atm = 760 mmHg d. 0.5 atm = 760 mmHg Correct answer: c. 1 atm = 760 mmHg

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