Q: A laboratory result is reported as $0.002 650 \mathrm{m}$. How many significant figures does this measurement have, and what is its scientific notation?

4 significant figures; $2.650 \times 10^{-3} \mathrm{m}$

Q: Which of the following is the correct scientific notation for $0.30 \mathrm{cm}$?

$3.0 \times 10^{-1} \mathrm{cm}$

Question 1

A nurse records a patient's temperature as 37°C. Which SI unit should be used to report this temperature in scientific research, and what is the equivalent value?

Accepted Answer

Kelvin; $310 \mathrm{K}$

Question 2

Which of the following measurements contains the greatest number of significant figures?

Accepted Answer

$0.00320 \mathrm{g}$

Question 3

A medication contains $0.50 \mathrm{g}$ of aspirin. Is this number measured or exact, and how many significant figures does it have?

Accepted Answer

Measured; 2 significant figures

Question 4

Which of the following is an example of an exact number?

Accepted Answer

$1 \mathrm{kg} = 1000 \mathrm{g}$

Question 5

A laboratory result is reported as $0.002 650 \mathrm{m}$. How many significant figures does this measurement have, and what is its scientific notation?

Accepted Answer

4 significant figures; $2.650 	imes 10^{-3} \mathrm{m}$

Question 6

Which of the following units is the largest?

Accepted Answer

centimeter (cm)

Question 7

A cube has sides of $1 \mathrm{cm}$. What is its volume in milliliters?

Accepted Answer

$1 \mathrm{mL}$

Question 8

Which of the following numbers has only one significant figure?

Accepted Answer

$0.0008 \mathrm{g}$

Question 9

A nurse measures a patient's mass as $65.6 \mathrm{lb}$. How many significant figures are in this measurement?

Accepted Answer

3

Question 10

Which of the following statements about zeros in significant figures is correct?

Accepted Answer

Zeros at the end of a decimal number are significant.

Question 11

Convert $1.5 \mathrm{L}$ of water to milliliters.

Accepted Answer

$1500 \mathrm{mL}$

Question 12

Which equality is correct for mass in the metric system?

Accepted Answer

$1 \mathrm{kg} = 1000 \mathrm{g}$

Question 13

A sample is measured as $400,000 \mathrm{m}$. How many significant figures does this measurement have?

Accepted Answer

1

Question 14

Which of the following is the correct scientific notation for $0.30 \mathrm{cm}$?

Accepted Answer

$3.0 	imes 10^{-1} \mathrm{cm}$

Question 15

A doctor prescribes $1 \mathrm{mg}$ of medication. How many micrograms is this?

Accepted Answer

$1000 \mathrm{\mu g}$

Question 16

Which of the following is NOT a base SI unit?

Accepted Answer

liter (L)

Question 17

A stopwatch measures the time of a race as $12.30 \mathrm{s}$. How many significant figures are in this measurement?

Accepted Answer

4

Question 18

Which prefix represents $1 	imes 10^{-6}$ in the metric system?

Accepted Answer

micro-

Question 19

A nurse measures a patient's height as $1.7 \mathrm{m}$. Which of the following is the correct conversion to centimeters?

Accepted Answer

$170 \mathrm{cm}$

Question 20

Which of the following is a measured number?

Accepted Answer

$7.902 \mathrm{cm}$

Chapter 2: Chemistry and Measurements – Units, Significant Figures, and Exact Numbers

Study Guide - Practice Questions

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