Question 1

Which of the following numbers contains exactly three significant figures?

Accepted Answer

$$0.0540$$

Question 2

A student records the mass of a sample as $$1.00000 g. $$How many significant figures does this measurement have?

Accepted Answer

$$6$$

Question 3

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close a measurement is to the true value; precision is how close repeated measurements are to each other.

Question 4

How many significant figures are in the number $$0.00090$$?

Accepted Answer

$$2$$

Question 5

A measurement is recorded as $$5.213 mL. $$Which digit is estimated?

Accepted Answer

$$3$$

Question 6

What is the correct answer, with the proper number of significant figures, for the calculation $$2.345 + 0.07 + 2.9975$$?

Accepted Answer

$$5.41$$

Question 7

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

Accepted Answer

Leading zeroes are always significant.

Question 8

A student measures the volume of a liquid in a graduated cylinder and reads the bottom of the meniscus at $$4.58 mL. $$Which of the following best describes this measurement?

Accepted Answer

It has three significant figures, with the last digit estimated.

Question 9

Which of the following numbers is ambiguous and should be avoided unless written in scientific notation?

Accepted Answer

$$5000$$

Question 10

When performing the calculation $$5.9 - 0.221$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$5.7$$

Question 11

Which of the following best explains why you should not round intermediate steps in a multistep calculation?

Accepted Answer

Rounding intermediate steps can introduce cumulative errors, affecting the final result's accuracy.

Question 12

A student makes three measurements of a block's mass: $$9.80 g$$, $$9.82 g$$, and $$9.81 g. $$The true mass is $$10.00 g. $$Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 13

Which of the following is an example of a systematic error?

Accepted Answer

A balance that always reads $$0.05 g $$too high.

Question 14

How many significant figures are in the number $$0.0000000009$$?

Accepted Answer

$$1$$

Question 15

Which of the following best describes random error?

Accepted Answer

It has an equal probability of being too high or too low.

Question 16

Which of the following numbers has five significant figures?

Accepted Answer

$$7.0301$$

Question 17

When multiplying $$2.34 by$$ $$0.070$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$0.16$$

Question 18

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

Accepted Answer

To reflect the precision of the measurement and avoid overstating certainty.

Significant Figures and Measurement Reliability in Chemistry

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