Question 1

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros in a number with a decimal point are significant.

Question 2

How many significant figures are in the number 0.00150?

Accepted Answer

3

Question 3

When multiplying $$8.3 	imes 10^4$ by 4.52$, what is the answer with the correct number of significant figures?

Accepted Answer

$$3.75 	imes 10^5$

Question 4

Which of the following numbers has exactly three significant figures?

Accepted Answer

0.00300

Question 5

Calculate $$15.95 / 0.00350$$ and express your answer with the correct number of significant figures.

Accepted Answer

$$4.6 	imes 10^3$

Question 6

Which operation will result in an answer with the least number of significant figures?

Accepted Answer

$$2.650 	imes 0.25$$

Question 7

A scientist measures the mass of a sample as 2500 g. How many significant figures does this measurement have?

Accepted Answer

2

Question 8

Perform the calculation $$(93.1 + 7.521) / 3.543 	imes 10$$^{-2}$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$2.84 	imes 10^3$

Question 9

Why are leading zeros in a decimal number considered insignificant?

Accepted Answer

They are placeholders and do not represent measured values.

Question 10

Calculate $$(7.956 - 7.813) / 5.667 	imes 10$$^{-2}$$ and report the answer with the correct number of significant figures.

Accepted Answer

$$2.52$$

Question 11

Which of the following best describes the purpose of significant figures in scientific measurements?

Accepted Answer

To reflect the precision of the measurement and the uncertainty in the last digit.

Question 12

If you subtract $$8.991 - 8.261$$ and then multiply by $$225$$, how many significant figures should your final answer have?

Accepted Answer

3

Question 13

A nurse needs to prepare a solution using $$2.650 g of a $$drug and $$0.25 L of $$solvent. What is the concentration, with the correct number of significant figures?

Accepted Answer

$$11 g/L$$

Question 14

Which of the following calculations is most likely to be affected by rounding errors due to significant figures?

Accepted Answer

$$83.74 + 32.6$$

Question 15

When adding $$25.2$$, $$7.46$$, and $$85.34$$, what is the sum with the correct number of decimal places?

Accepted Answer

$$118.0$$

Question 16

A chemist calculates $$(65.132 	imes 16.73) - 81.62. $$What is the answer with the correct number of significant figures?

Accepted Answer

$$1,008$$

Question 17

Which of the following is the correct way to report the result of $$83.74 + 32.6$$?

Accepted Answer

$$116.3$$

Question 18

A measurement is recorded as $$30.00 mL. $$How many significant figures does this value have?

Accepted Answer

4

Question 19

Which of the following is NOT a rule for determining significant figures?

Accepted Answer

Trailing zeros in a number without a decimal point are always significant.

Question 20

Why is it important to use the correct number of significant figures in scientific calculations?

Accepted Answer

To avoid overestimating the precision of results.

Significant Figures and Their Application in Calculations

Guida di studio - Domande di pratica

Study guide - Flashcard