Q: Which of the following is the correct value for the speed of light in a vacuum?

$$3.00 \times 10^8$ \ \mathrm{m/s}$$

Question 1

Which of the following is the correct SI unit for measuring pressure, and what is its equivalent in terms of base SI units?

Accepted Answer

Pascal (Pa); $$1 \ \mathrm{Pa} = 1 \ \mathrm{kg} / (\mathrm{m} \cdot \mathrm{s}^2)$$

Question 2

A laboratory experiment requires you to convert 2.5 gallons of water to liters. Which conversion factor should you use, and what is the correct answer?

Accepted Answer

Use $$1 \ \mathrm{gal} = 3.7854 \ \mathrm{L}$$; $$2.5 \ \mathrm{gal} = 9.464 \ \mathrm{L}$$

Question 3

Which of the following prefixes and their meanings is correctly matched?

Accepted Answer

milli- (m): $$10^{-3}$$

Question 4

A patient’s body temperature is measured at $$102.2^\circ \mathrm{F}. $$What is this temperature in Kelvin?

Accepted Answer

Use $$K = \frac{5}{9}(T_{\mathrm{F}} - 32) + 273.15$$; $$K = 312.15$$

Question 5

Which of the following is the correct value for Avogadro’s number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 6

If a sample of gas occupies $$500 \ \mathrm{mL} at$$ $$1 \ \mathrm{atm}$$, what is its volume in liters at the same pressure?

Accepted Answer

$$0.5 \ \mathrm{L}$$

Question 7

Which of the following is the correct SI unit for energy, and what is its relationship to calories?

Accepted Answer

Joule (J); $$1 \ \mathrm{J} = 0.23901 \ \mathrm{cal}$$

Question 8

A chemist needs to convert $$0.005 \ \mathrm{kg} to $$milligrams. What is the correct answer?

Accepted Answer

$$0.005 \ \mathrm{kg} = 5,000 \ \mathrm{mg}$$

Question 9

Which of the following is the correct formula for converting Celsius to Fahrenheit?

Accepted Answer

$$T_{\mathrm{F}} = \frac{9}{5}T_{\mathrm{C}} + 32$$

Question 10

A pressure gauge reads $$760 \ \mathrm{mmHg}. $$What is this pressure in atmospheres (atm)?

Accepted Answer

$$1 \ \mathrm{atm}$$

Question 11

Which of the following is the correct SI unit for electrical charge?

Accepted Answer

Coulomb (C)

Question 12

A student needs to convert $$3.2 \ \mathrm{km} to $$centimeters. What is the correct answer?

Accepted Answer

$$3.2 \ \mathrm{km} = 320,000 \ \mathrm{cm}$$

Question 13

Which of the following is the correct value for the speed of light in a vacuum?

Accepted Answer

$$3.00 	imes 10^8$ \ \mathrm{m/s}$$

Question 14

A solution contains $$0.25 \ \mathrm{mol} of $$NaCl. How many formula units of NaCl are present?

Accepted Answer

$$1.51 	imes 10$$^{23}$$

Question 15

Which of the following is the correct SI unit for volume?

Accepted Answer

Cubic meter ($$\mathrm{m}^3)$$

Question 16

A sample of gas is measured at $$25^\circ \mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$298.15 \ \mathrm{K}$$

Question 17

Which of the following is the correct relationship between 1 atm and other pressure units?

Accepted Answer

$$1 \ \mathrm{atm} = 101,325 \ \mathrm{Pa} = 760 \ \mathrm{mmHg} = 14.696 \ \mathrm{lb/in}^2$$

Question 18

Which of the following is the correct SI unit for the amount of substance?

Accepted Answer

Mole (mol)

Question 19

A chemist needs to convert $$0.75 \ \mathrm{m}^3 to $$liters. What is the correct answer?

Accepted Answer

Introductory Chemistry Study Notes: Units, Measurements, and Fundamental Constants

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