Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$4.5 	imes 10^1$

Question 2

A student measures the mass of a sample as $$12.34 g$$, $$12.31 g$$, and $$12.36 g. $$What best describes these measurements?

Accepted Answer

High accuracy, high precision

Question 3

How many significant figures are in the measurement $$0.004560$$?

Accepted Answer

5

Question 4

Calculate $$3.24 + 7.1 + 0.205$$ and express your answer with the correct number of decimal places.

Accepted Answer

$$10.6$$

Question 5

Which of the following best describes the rule for significant figures when multiplying measured numbers?

Accepted Answer

The answer should have the same number of significant figures as the measurement with the fewest significant figures.

Question 6

A student adds $$2.56 g $$and $$3.1 g. $$What is the correct answer with proper significant figures?

Accepted Answer

$$5.7 g$$

Question 7

Which of the following is the correct result for $$4.56 	imes 1.4$$, using the rules for significant figures?

Accepted Answer

$$6.4$$

Question 8

A measurement is recorded as $$0.02030 mL. $$How many significant figures does this value have?

Accepted Answer

5

Question 9

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

Accepted Answer

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

Question 10

A student multiplies $$2.13 (3 $$sig figs) by $$0.004 (1 $$sig fig). What is the correct answer with proper significant figures?

Accepted Answer

$$0.009$$

Question 11

Which of the following is the correct answer for $$12.11 - 0.3$$, using the rules for significant figures?

Accepted Answer

$$11.8$$

Question 12

A laboratory balance has an error of $$\pm 0.01 g. If a $$student measures a sample as $$5.67 g$$, what is the range of possible true values?

Accepted Answer

$$5.66 g to$$ $$5.68 g$$

Question 13

Which of the following calculations is performed correctly according to the rules for significant figures?

Accepted Answer

$$2.5 	imes 3.42 = 8.6$$

Question 14

A student records the following measurements: $$1.23 m$$, $$1.2 m$$, and $$1.234 m. $$What is the correct sum with proper significant figures?

Accepted Answer

$$3.7 m$$

Question 15

Which of the following best describes a systematic error?

Accepted Answer

An error that can be corrected by calibration and affects accuracy.

Question 16

A student divides $$6.022 	imes 10$$^{23}$$ by 2.0$ (2 sig figs). What is the correct answer with proper significant figures?

Accepted Answer

$$3.011 	imes 10$$^{23}$$

Measurement, Significant Figures, and Calculations in Chemistry

Study Guide - Practice Questions