Question 1

Which of the following best describes a compound?

Accepted Answer

A combination of two or more elements in a fixed ratio.

Question 2

Which of the following statements about gases is correct according to the molecular view?

Accepted Answer

Gas molecules are far apart and move at high speeds.

Question 3

A sample of ethanol has a mass of $$79.0\ \mathrm{g}$$ and a volume of $$100.0\ \mathrm{mL}. $$What is its density?

Accepted Answer

$$0.790\ \mathrm{g/mL}$$

Question 4

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 5

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 6

Which of the following is the correct scientific notation for $$0.000481$$?

Accepted Answer

$$4.81 	imes 10$$^{-4}$$

Question 7

How many significant figures are in the measurement $$0.03050$$?

Accepted Answer

4

Question 8

A student measures the mass of a sample three times and gets values very close to each other, but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 9

Which SI prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro-

Question 10

Convert $$7.89\ \mathrm{m} to $$inches. (Given: $$1\ \mathrm{in} = 2.54\ \mathrm{cm})$$

Accepted Answer

$$311\ \mathrm{in}$$

Question 11

Which of the following is an exact number?

Accepted Answer

The number of eggs in a dozen

Question 12

What is the temperature in $$^\circ\mathrm{F} of a $$person with a body temperature of $$37.2^\circ\mathrm{C}$$?

Accepted Answer

$$99.0^\circ\mathrm{F}$$

Question 13

Which of the following is the correct symbol for the element sodium?

Accepted Answer

Na

Question 14

A solution has a density of $$4.23\ \mathrm{g/mL}. $$What is the volume (in mL) of $$25.0\ \mathrm{g} of $$this solution?

Accepted Answer

$$5.91\ \mathrm{mL}$$

Question 15

Which of the following is a physical property?

Accepted Answer

Density

Question 16

When adding $$2.4 + 0.24 + 0.024$$, what is the correct answer based on significant figures?

Accepted Answer

$$2.7$$

Question 17

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout

Question 18

What is the SI base unit for temperature?

Accepted Answer

Kelvin

Question 19

Which of the following measurements contains three significant figures?

Accepted Answer

$$2.06 	imes 10^3$

Question 20

A student needs to convert $$515\ \mathrm{m/s} to $$miles per hour. Which conversion factors should be used?

Accepted Answer

$$1\ \mathrm{mile} = 1.609\ \mathrm{km}$$, $$1\ \mathrm{hour} = 3600\ \mathrm{s}$$

Introduction to Matter, Measurement, and Scientific Calculations

Study Guide - Practice Questions