Q: A student needs to convert $5.00 \text{ ft}$ to centimeters. Which sequence of unit factors should be used?

$5.00 \text{ ft} \times \frac{12 \text{ in}}{1 \text{ ft}} \times \frac{2.54 \text{ cm}}{1 \text{ in}}$

Question 1

A scientist measures a length of 16.0 inches. What is this length in centimeters? (Use $1 	ext{ in.} = 2.54 	ext{ cm}$)

Accepted Answer

$40.6 	ext{ cm}$

Question 2

A car achieves a gas mileage of $36.1 	ext{ mi/gal}$. How many kilometers can it travel on $1.00$ liter of gasoline? ($1 	ext{ mi} = 1.609 	ext{ km}$, $1 	ext{ gal} = 3.785 	ext{ L}$)

Accepted Answer

$15.4 	ext{ km}$

Question 3

The left field wall at Wrigley Field in Chicago measures $355 	ext{ ft}$. What is this distance in meters? ($1 	ext{ ft} = 0.3048 	ext{ m}$)

Accepted Answer

$108 	ext{ m}$

Question 4

Normal human body temperature is $98.6 ^\circ 	ext{F}$. What is this temperature in Kelvin?

Accepted Answer

$310 	ext{ K}$

Question 5

Outer space has a temperature of approximately $4 	ext{ K}$. What is this temperature in degrees Fahrenheit?

Accepted Answer

$-452.1 ^\circ 	ext{F}$

Question 6

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$T_K = T_C + 273.15$

Question 7

A laboratory thermometer reads $25.0 ^\circ 	ext{C}$. What is this temperature in degrees Fahrenheit?

Accepted Answer

$77.0 ^\circ 	ext{F}$

Question 8

Which of the following statements about unit conversion is correct?

Accepted Answer

Unit factors do not change the measurement, only the unit.

Question 9

A sample weighs $2.00 	ext{ lb}$. What is its mass in grams? ($1 	ext{ lb} = 453.59 	ext{ g}$)

Accepted Answer

$907 	ext{ g}$

Question 10

Which of the following is NOT a correct step when converting units?

Accepted Answer

Ignore significant figures and units in the final answer.

Question 11

A temperature is measured as $300 	ext{ K}$. What is this temperature in degrees Celsius?

Accepted Answer

$26.85 ^\circ 	ext{C}$

Question 12

Which of the following best explains why $273.15$ is used in the conversion between Celsius and Kelvin?

Accepted Answer

It is the difference in the zero points of the Celsius and Kelvin scales.

Question 13

A student needs to convert $5.00 	ext{ ft}$ to centimeters. Which sequence of unit factors should be used?

Accepted Answer

$5.00 	ext{ ft} 	imes \frac{12 	ext{ in}}{1 	ext{ ft}} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ in}}$

Question 14

Which temperature scale does NOT use the degree symbol?

Accepted Answer

Kelvin

Question 15

A chemical reaction requires a temperature of $373 	ext{ K}$. What is this temperature in degrees Celsius?

Accepted Answer

$100 ^\circ 	ext{C}$

Question 16

If the boiling point of water is $100 ^\circ 	ext{C}$, what is it in degrees Fahrenheit?

Accepted Answer

$212 ^\circ 	ext{F}$

Question 17

A temperature is measured as $-40 ^\circ 	ext{C}$. What is this temperature in degrees Fahrenheit?

Accepted Answer

$-40 ^\circ 	ext{F}$

Question 18

Which of the following is the correct formula to convert Fahrenheit to Celsius?

Accepted Answer

$T_C = \frac{5}{9}(T_F - 32)$

Question 19

A student records a temperature of $0 ^\circ 	ext{C}$. What is this temperature in Kelvin?

Accepted Answer

$273.15 	ext{ K}$

Unit Conversions and Temperature Scales in General Chemistry

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