$$90\,\text{minutes} \times \frac{1\,\text{hour}}{60\,\text{minutes}} \times 60\,\text{miles/hour} = 90\,\text{miles}$$

$$1\,\text{cm} = 0.01\,\text{m}$$

Question 1

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

Accepted Answer

kilogram (kg)

Question 2

A student measures the length of a red line as shown in the image. What is the correct length, including the estimated digit?

Accepted Answer

$$2.30\,	ext{cm}$$

Question 3

How many significant figures are in the number $$0.0200$$?

Accepted Answer

3

Question 4

Which of the following numbers contains only nonsignificant zeros?

Accepted Answer

$$0.0002$$

Question 5

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 6

Round $$3.1457 to $$three significant figures.

Accepted Answer

$$3.15$$

Question 7

Which calculation correctly applies the rules for significant figures: $$6.0\,	ext{g} \div 2.00\,	ext{g}$$?

Accepted Answer

$$3.0\,	ext{g}$$

Question 8

Which prefix represents $$10^{-6}$$?

Accepted Answer

micro

Question 9

Which is the larger unit: $$1\,	ext{kg} or$$ $$1\,	ext{cg}$$?

Accepted Answer

$$1\,	ext{kg}$$

Question 10

A car travels at $$60\,	ext{miles/hour}$$ for $$90$$ minutes. How far does it travel?

Accepted Answer

$$90\,	ext{minutes} 	imes \frac{1\,	ext{hour}}{60\,	ext{minutes}} 	imes 60\,	ext{miles/hour} = 90\,	ext{miles}$$

Question 11

How many centimeters are in $$2.44\,	ext{m}$$?

Accepted Answer

$$244\,	ext{cm}$$

Question 12

A sample of salmon contains $$1.9\%$$ omega-3 fatty acids by mass. How many grams of omega-3 are in $$250\,	ext{g} of $$salmon?

Accepted Answer

$$4.75\,	ext{g}$$

Question 13

If a person weighs $$85\,	ext{kg}$$, what is their weight in pounds? ($$1\,	ext{kg} = 2.2\,	ext{lb})$$

Accepted Answer

$$187\,	ext{lb}$$

Question 14

How many seconds are in a year? (Assume $$1\,	ext{year} = 365\,	ext{days})$$

Accepted Answer

$$31,536,000\,	ext{s}$$

Question 15

A metal sample has a mass of $$48.0\,	ext{g}$$ and displaces water from $$25.0\,	ext{mL} to$$ $$33.0\,	ext{mL}. $$What is its density?

Accepted Answer

$$6.00\,	ext{g/mL}$$

Question 16

An unknown liquid has a density of $$1.32\,	ext{g/mL}. $$What is the volume of $$14.7\,	ext{g} of $$this liquid?

Accepted Answer

$$11.1\,	ext{mL}$$

Question 17

Which of the following is the correct equality for the prefix 'centi-'?

Accepted Answer

$$1\,	ext{cm} = 0.01\,	ext{m}$$

Question 18

Which of the following objects will float in water (density $$= 1.00\,	ext{g/mL}$$)?

Accepted Answer

Ice ($$0.92\,	ext{g/mL})$$

Units, Measurements, and Significant Figures in Chemistry

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