Question 1

Which of the following numbers is correctly expressed in scientific notation?

Accepted Answer

$7.0 \times 10^7$

Question 2

How many significant figures are in the measurement $0.0410$?

Accepted Answer

3

Question 3

A laboratory scale reads $45.119$ g. Which digit is the estimated digit in this measurement?

Accepted Answer

9

Question 4

Round $255.98612$ to four significant figures.

Accepted Answer

$256.0$

Question 5

Which of the following is the correct result for $1203 \div 90.3$ rounded to the correct number of significant figures?

Accepted Answer

$13.3$

Question 6

Convert $15$ miles to kilometers. ($1$ mile $= 1.609$ km) Report your answer with the correct number of significant figures.

Accepted Answer

$24.1$ km

Question 7

A student measures a volume as $40.5$ L. How many significant figures does this measurement have?

Accepted Answer

3

Question 8

Which of the following rules is correct regarding significant figures?

Accepted Answer

All nonzero digits are significant.

Question 9

Convert $2.5$ kg to grams and report with the correct number of significant figures.

Accepted Answer

$2.5 \times 10^3$ g

Question 10

A sample of copper has a volume of $300. \text{cm}^3$. If the density of copper is $8.96 \text{g/cm}^3$, what is the mass of the sample? (Report with the correct number of significant figures.)

Accepted Answer

$2.69 \times 10^3$ g

Question 11

Which of the following is the correct result for $3.11 \times 22 \times 0.04$ rounded to the correct number of significant figures?

Accepted Answer

$2.7$

Question 12

Convert $1.00 \times 10^4$ micrometers ($\mu$m) to millimeters (mm).

Accepted Answer

$10.0$ mm

Question 13

A solution has a mass of $541$ g and a volume of $700.0$ mL. What is its density in $\text{g/mL}$?

Accepted Answer

$0.773$ \text{g/mL}$

Question 14

Which of the following numbers has exactly three significant figures?

Accepted Answer

$0.0410$

Question 15

Convert $33$ feet to centimeters. ($1$ ft $= 30.48$ cm) Report your answer with the correct number of significant figures.

Accepted Answer

$1.0 \times 10^2$ cm

Question 16

Which of the following is the correct result for $54.321 \div 12.345$ rounded to the correct number of significant figures?

Accepted Answer

$4.40$

Question 17

Which of the following is the correct way to express $0.0000092$ in scientific notation?

Accepted Answer

$9.2 \times 10^{-6}$

Question 18

A car travels at $60.0$ mi/hr. Convert this speed to km/s. ($1$ mi $= 1.609$ km, $1$ hr $= 3600$ s)

Accepted Answer

$0.0268$ km/s

Question 19

Which of the following statements about significant figures is correct?

Accepted Answer

When multiplying or dividing, the result should have the same number of significant figures as the measurement with the fewest significant figures.

Question 20

Convert $5.00$ gallons to liters. ($1$ gal $= 3.785$ L) Report your answer with the correct number of significant figures.

Accepted Answer

$18.9$ L

Scientific Notation, Significant Figures, and Unit Conversions in Chemistry

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