Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more different elements chemically combined in a fixed ratio.

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice to form liquid water.

Question 3

A sample of granite is best classified as which of the following?

Accepted Answer

Heterogeneous mixture

Question 4

Which property is intensive?

Accepted Answer

Density

Question 5

Which separation technique would be most effective for separating a mixture of sand and salt water?

Accepted Answer

Filtration

Question 6

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

Accepted Answer

Low accuracy, high precision

Question 7

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin (K)

Question 8

What is the density of a substance if a 25.0 g sample occupies a volume of 5.00 mL?

Accepted Answer

$$5.00\ \mathrm{g/mL}$$

Question 9

Which law states that the total mass of substances present after a chemical reaction is the same as the mass before the reaction?

Accepted Answer

Law of Conservation of Mass

Question 10

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 11

A solution of salt water is classified as:

Accepted Answer

Homogeneous mixture

Question 12

Which of the following is the correct formula for calculating kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 13

Convert 25.0 °C to Kelvin.

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 14

Which of the following is an example of a polyatomic ion?

Accepted Answer

$$\mathrm{SO}_4$$^{2-}$$

Question 15

Which of the following is the empirical formula for glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$)?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 16

Which of the following is the correct name for $$\mathrm{Fe}_2\mathrm{O}_3$$?

Accepted Answer

Iron(III) oxide

Question 17

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. How many moles of water does it contain?

Accepted Answer

$$0.500$$ mol

Question 18

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH}_4)_2\mathrm{SO}_4$$

Question 19

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons and electrons, but different numbers of neutrons.

Question 20

Which of the following is the correct conversion factor to change centimeters to inches?

Accepted Answer

$$\frac{2.54\ \mathrm{cm}}{1\ \mathrm{in.}}$$

General Chemistry: Matter, Measurement, and Atomic Theory

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