Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to air

Question 2

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

Accepted Answer

A salad with lettuce, tomatoes, and cucumbers

Question 3

A student measures the mass of a sample three times and gets values of 2.01 g, 2.00 g, and 2.02 g. The true mass is 2.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 4

Which of the following is the correct scientific notation for the number 0.000456?

Accepted Answer

$$4.56 	imes 10$$^{-5}$$

Question 5

Which of the following statements about Dalton’s atomic theory is NOT correct?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 6

Which of the following is a physical change?

Accepted Answer

Boiling of water to form steam

Question 7

A sample contains 3.0 moles of NaCl. How many formula units of NaCl are present in the sample? (Avogadro’s number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.81 	imes 10$$^{24}$$

Question 8

Which of the following is the correct symbol for an atom with 17 protons, 18 neutrons, and 17 electrons?

Accepted Answer

$$^{35}_{17}\mathrm{Cl}$$

Question 9

Which of the following best explains why isotopes of the same element have different masses?

Accepted Answer

They have different numbers of neutrons.

Question 10

A student needs to prepare 250.0 mL of a 0.100 M NaCl solution. How many grams of NaCl (molar mass = 58.44 g/mol) are required?

Accepted Answer

1.46 g

Question 11

Which of the following is a correct statement about the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 12

Which of the following is the correct electron configuration for a neutral atom of oxygen ($$Z=8$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 13

Which of the following is the correct name for the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 14

A 5.00 g sample of a compound contains 2.00 g of hydrogen and 3.00 g of oxygen. What is the percent by mass of hydrogen in the compound?

Accepted Answer

40.0%

Question 15

Which of the following is a correct statement about significant figures?

Accepted Answer

Zeros between nonzero digits are significant.

Question 16

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$

Question 17

A patient receives 500.0 mL of a saline solution containing 0.90% NaCl by mass. If the density of the solution is $$1.00 \mathrm{g/mL}$$, how many grams of NaCl does the patient receive?

Accepted Answer

4.5 g

Question 18

Which of the following is the correct order of metric prefixes from largest to smallest?

Accepted Answer

kilo, centi, milli, micro

Question 19

Which of the following best describes the difference between a hypothesis and a theory?

Accepted Answer

A hypothesis is a tentative explanation, while a theory is a well-tested explanation.

Question 20

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

Accepted Answer

$$\mathrm{Density} = \frac{\mathrm{mass}}{\mathrm{volume}}$$

General Chemistry Exam 1 Review: Foundations, Measurements, and Scientific Method

Study Guide - Practice Questions

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