$$4.00 \times 10^3$ \text{ kg}$

$$1 \text{ inch} = 2.54 \text{ cm}$$

$$1 \text{ mile} = 1.609 \text{ km}$$

Question 1

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

Accepted Answer

$$2.5 	imes 10^3$

Question 2

A laboratory measurement yields $$0.000880 kg. $$How many significant figures does this value have?

Accepted Answer

3

Question 3

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros at the end of a number with a decimal point are counted as significant figures.

Question 4

Convert $$4.00 	imes 10^6$ grams to kilograms using scientific notation.

Accepted Answer

$$4.00 	imes 10^3$ 	ext{ kg}$

Question 5

A student measures the length of a table as $$1.1$$ meters. Is this an exact or measured number?

Accepted Answer

Measured number

Question 6

When multiplying $$6.8 (2 $$sig figs) by $$0.37 (2 $$sig figs), how many significant figures should the final answer have?

Accepted Answer

2

Question 7

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

Accepted Answer

micro

Question 8

A patient receives a medication dose of $$2.0 	imes 10$$^{-3}$$ mL. How many significant figures are in this measurement?

Accepted Answer

2

Question 9

If you add $$104 (no $$decimal places) and $$7.8 ($$one decimal place), how many decimal places should the answer have?

Accepted Answer

0

Question 10

Which of the following is the correct conversion factor for inches to centimeters?

Accepted Answer

$$1 	ext{ inch} = 2.54 	ext{ cm}$$

Question 11

A sample has a mass of $$48 kg $$and a volume of $$20 L. $$What is its density in $$	ext{kg}/	ext{L}$$?

Accepted Answer

$$2.4 	ext{ kg}/	ext{L}$$

Question 12

Which of the following numbers has three significant figures?

Accepted Answer

$$0.00300$$

Question 13

What is the value of $$1$$ femto ($$f) in $$scientific notation?

Accepted Answer

$$10^{-15}$$

Question 14

Round $$19.7616 to $$two significant figures. Which is correct?

Accepted Answer

$$20.$$

Question 15

Which measurement tool would you use to determine the mass of a sample in the laboratory?

Accepted Answer

Balance (scale)

Question 16

A body fat percentage is $$35\%$$ and the total body weight is $$100 kg. $$What is the mass of body fat?

Accepted Answer

$$35 kg$$

Question 17

Which metric prefix increases the size of the unit by a factor of $$10^6$$?

Accepted Answer

Mega ($$M)$$

Question 18

If you multiply $$4.5 ($$two sig figs) by $$0.0108 ($$three sig figs), what should the answer be rounded to?

Accepted Answer

Two significant figures

Question 19

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

Accepted Answer

The number of students in a classroom

Question 20

A car drives at $$65$$ mph. If you want to convert this speed to meters per second, which conversion factor would you use first?

Accepted Answer

$$1 	ext{ mile} = 1.609 	ext{ km}$$

Chemistry and Measurements: Scientific Notation, Significant Figures, and Unit Conversions

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