Question 1

When rounding the number 3.1457 g to three significant figures, which of the following is correct?

Accepted Answer

$$3.15 	ext{ g}$$

Question 2

A laboratory technician measures the mass of a sample as 0.004560 g. How many significant figures does this measurement have?

Accepted Answer

5

Question 3

Which rule should be applied when rounding off the number 8.456 to two significant figures?

Accepted Answer

Drop all digits after the second significant figure and round up if the next digit is 5 or greater.

Question 4

Calculate $$5.00 	ext{ cm} 	imes 3.408 	ext{ cm} \div 2.0 	ext{ cm}$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$8.5 	ext{ cm}$$

Question 5

A nurse adds three measured volumes: $$2.012 	ext{ mL}$$, $$1.09 	ext{ mL}$$, and $$3.0 	ext{ mL}. $$What is the sum, reported with the correct number of decimal places?

Accepted Answer

$$6.1 	ext{ mL}$$

Question 6

Which of the following best describes how to determine the number of significant figures in the result of a multiplication or division?

Accepted Answer

Use the same number of significant figures as the measurement with the fewest significant figures.

Question 7

A chemist multiplies $$2.5 	ext{ cm} 	imes 0.30 	ext{ cm}$$ and divides by $$1.88 	ext{ cm}. $$What is the answer with the correct number of significant figures?

Accepted Answer

$$3.4 	ext{ cm}$$

Question 8

When adding $$35.09 	ext{ g}$$ and $$3.0 	ext{ g}$$, what is the correct answer with the proper number of decimal places?

Accepted Answer

$$38.1 	ext{ g}$$

Question 9

A student divides $$6.0 	ext{ g} by$$ $$2.00 	ext{ g}$$ and gets $$3 on $$the calculator. How should the answer be reported with the correct number of significant figures?

Accepted Answer

$$3.0 	ext{ g}$$

Question 10

Which of the following is true about significant zeros in a calculated answer?

Accepted Answer

Zeros can be added to the end of a number to ensure the correct number of significant figures.

Question 11

A doctor subtracts $$35.09 	ext{ mg}$$ from $$37.0 	ext{ mg} to $$determine the change in a patient's medication. What is the correct answer with the proper number of decimal places?

Accepted Answer

$$1.9 	ext{ mg}$$

Question 12

Which of the following measurements contains three significant figures?

Accepted Answer

3.00 g

Question 13

If the first digit to be dropped during rounding is 5 or greater, what should you do?

Accepted Answer

Increase the last retained digit by 1.

Question 14

Which of the following best describes the rule for addition and subtraction with measured numbers?

Accepted Answer

The answer should have the same number of decimal places as the measurement with the fewest decimal places.

Question 15

A scientist multiplies $$3260 by$$ $$10^2$$ and rounds to three significant figures. What is the correct answer?

Accepted Answer

$$3.26 	imes 10^5$

Question 16

Which of the following is the correct value when 3.1457 g is rounded to two significant figures?

Accepted Answer

$$3.1 	ext{ g}$$

Question 17

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

Accepted Answer

$$8.4$$

Question 18

Which of the following is NOT a correct application of significant figures in calculations?

Accepted Answer

Reporting the answer to the same number of significant figures as the measurement with the most significant figures in division.

Significant Figures and Calculations in Chemistry Measurements

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