Question 1

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

Accepted Answer

$4.5 	imes 10^{1}$

Question 2

A laboratory measurement is recorded as 24.6 mm. Which digit is considered uncertain due to measurement limitations?

Accepted Answer

6

Question 3

How many significant figures are in the measurement 0.004560?

Accepted Answer

5

Question 4

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 5

A student multiplies $2.34$ (3 sig figs) by $0.10$ (2 sig figs). What is the correct number of significant figures in the final answer?

Accepted Answer

2

Question 6

Which of the following correctly applies the rules for significant figures in addition: $5.74 + 0.823 + 2.651$?

Accepted Answer

$9.21$

Question 7

A sample has a mass of $27.2$ grams and a volume of $22.5$ mL. What is its density?

Accepted Answer

$1.21$ g/mL

Question 8

Which SI prefix multiplier would be most appropriate for expressing the length of a chemical bond (about $120$ pm)?

Accepted Answer

picometer

Question 9

A car travels $60.0$ miles per hour. Convert this speed to kilometers per hour. ($1$ mile $= 1.609$ km)

Accepted Answer

$96.5$ km/h

Question 10

Which of the following statements about mass and weight is correct?

Accepted Answer

Mass is a measure of the quantity of matter, while weight depends on gravity.

Question 11

A solution map is used in chemistry to:

Accepted Answer

Outline the steps required to solve a problem

Question 12

If you convert $5.00$ cm$^3$ to mL, what is the result?

Accepted Answer

$5.00$ mL

Question 13

A NASA probe was supposed to orbit Mars at $155$ km, but was programmed for $1.55 	imes 10^5$ ft. What is the difference in kilometers between the intended and actual altitudes? ($1$ ft $= 0.3048$ m)

Accepted Answer

$107$ km

Question 14

Which of the following is NOT a derived unit?

Accepted Answer

meter

Question 15

When converting $3.0$ cm$^2$ to mm$^2$, what is the correct answer? ($1$ cm $= 10$ mm)

Accepted Answer

$300$ mm^2$

Question 16

Which of the following best describes the uncertainty in a measurement?

Accepted Answer

It is indicated by the last reported digit.

Question 17

A balance has markings every $0.1$ gram. If you measure a mass as $1.26$ grams, to what place is the last digit estimated?

Accepted Answer

Hundredths place

Question 18

Which of the following conversion factors is exact?

Accepted Answer

$1$ in $= 2.54$ cm

Question 19

A liquid has a density of $0.789$ g/mL. What volume (in mL) is needed to obtain $50.0$ g of the liquid?

Accepted Answer

$63.4$ mL

Question 20

Which of the following is the correct way to round $2.375$ to two significant figures?

Accepted Answer

$2.4$

Measurement and Problem Solving: Study Notes for Introductory Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards