Question 1

Which of the following numbers has exactly three significant figures?

Accepted Answer

205 °C

Question 2

When rounding 14.82 to two significant figures, what is the correct result?

Accepted Answer

$$15$$

Question 3

A student multiplies $$5.00 	ext{ cm} by$$ $$3.408 	ext{ cm}$$ and divides by $$2.0 	ext{ cm}. $$What is the answer with the correct number of significant figures?

Accepted Answer

$$8.5 	ext{ cm}$$

Question 4

Which rule is applied when rounding off a number where the first digit to be dropped is 5 or greater?

Accepted Answer

Increase the last retained digit by 1.

Question 5

How many significant figures are in the measurement $$0.0004 	ext{ s}$$?

Accepted Answer

1

Question 6

Which of the following measurements contains a zero that is NOT significant?

Accepted Answer

0.075 cm

Question 7

A nurse records a patient's mass as $$112 486 	ext{ g}. $$What is the value rounded to three significant figures?

Accepted Answer

Question 8

When adding $$6.012$$, $$0.09$$, and $$6.0$$, what is the correct answer with proper significant figures?

Accepted Answer

$$12.1$$

Question 9

Which of the following is the correct way to express $$3.145 	ext{ g}$$ rounded to two significant figures?

Accepted Answer

$$3.1 	ext{ g}$$

Question 10

A scientist calculates $$4.8 	imes 10^5$ 	ext{ m} in an $$experiment. How many significant figures does this value have?

Accepted Answer

2

Question 11

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros between nonzero digits are always significant.

Question 12

A measurement is recorded as $$301 	ext{ g}. $$How many significant figures does it have?

Accepted Answer

3

Question 13

When performing the calculation $$5.00 	ext{ cm} 	imes 3.408 	ext{ cm} \div 2.0 	ext{ cm}$$, which measurement determines the number of significant figures in the final answer?

Accepted Answer

$$2.0 	ext{ cm}$$

Question 14

A laboratory result is $$0.075 	ext{ cm}. $$Which digit is significant?

Accepted Answer

The 7 and 5

Question 15

Which of the following is the correct answer for $$409 	ext{ mg} + 0.1 	ext{ mg}$$, rounded to the proper significant figures?

Accepted Answer

Question 16

Why are zeros added to the end of a calculated answer such as $$4.00$$?

Accepted Answer

To show the correct number of significant figures

Question 17

Which operation requires the final answer to have the same number of decimal places as the measurement with the fewest decimal places?

Accepted Answer

Addition and subtraction

Question 18

A sample is measured as $$16.00 	ext{ mL}. $$How many significant figures does this value have?

Accepted Answer

4

Question 19

Which of the following numbers has only one significant figure?

Accepted Answer

0.0004

Question 20

A student calculates $$8.42$$ and needs to round it to two significant figures. What is the correct answer?

Accepted Answer

$$8.4$$

Chemistry and Measurements: Significant Figures and Rounding in GOB Chemistry

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