Q: Which of the following is the correct formula for calculating density?

$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$

Q: Which of the following is the correct formula for converting Fahrenheit to Celsius?

$^\circ C = (^\circ F - 32) \times \frac{5}{9}$

Question 1

Which of the following statements best describes a scientific theory?

Accepted Answer

A theory is a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, and tested hypotheses.

Question 2

A student measures the mass of a sample three times and records the values: 5.12 g, 5.13 g, and 5.11 g. The true mass is 5.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Flammability

Question 4

Convert 25.0 °C to Kelvin using the correct formula.

Accepted Answer

$K = (25.0 + 273.15)$

Question 5

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 6

A sample contains $3.01 	imes 10^{23}$ molecules of water. How many moles of water are present?

Accepted Answer

$0.50$ mol

Question 7

Which of the following is the correct formula for calculating density?

Accepted Answer

$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$

Question 8

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 9

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 10

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$	ext{CH}_2	ext{O}$

Question 11

Which of the following best describes the difference between mass number and atomic number?

Accepted Answer

Mass number is the sum of protons and neutrons; atomic number is the number of protons.

Question 12

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$6.022 	imes 10^{23}$

Question 13

A student needs to prepare 0.25 mol of NaCl. How many formula units of NaCl are required?

Accepted Answer

$1.51 	imes 10^{23}$

Question 14

Which of the following is a correct statement about metals?

Accepted Answer

Metals are malleable and ductile.

Question 15

Which of the following is the correct formula for converting Fahrenheit to Celsius?

Accepted Answer

$^\circ C = (^\circ F - 32) 	imes \frac{5}{9}$

Question 16

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances in which each substance retains its own chemical identity.

Question 17

Which of the following is a correct statement about the location of electrons in an atom?

Accepted Answer

Electrons are found in regions of space called orbitals around the nucleus.

Question 18

A sample of gas has a mass of 2.50 g and occupies a volume of 1.00 L. What is the density of the gas?

Accepted Answer

$2.50 	ext{ g/L}$

Question 19

Which of the following is a correct comparison between metals, nonmetals, and metalloids?

Accepted Answer

Metals are good conductors, nonmetals are poor conductors, and metalloids have intermediate conductivity.

CHE 111 General Chemistry I – Study Guide: Matter, Measurement, and Atomic Theory

Study Guide - Practice Questions

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