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

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