Question 1

Which of the following statements best describes a chemical change?

Accepted Answer

A silver spoon tarnishing when exposed to air.

Question 2

A sample of a compound contains only carbon and oxygen. Which of the following best classifies this sample?

Accepted Answer

Compound

Question 3

Which of the following is the correct scientific notation for the number 0.0000152?

Accepted Answer

$$1.52 	imes 10$$^{-5}$$

Question 4

A student measures the mass of a sample as 12.30 g and the volume as 4.1 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.0\ \mathrm{g/mL}$$

Question 5

Which of the following best describes the arrangement of particles in a solid?

Accepted Answer

Particles are closely packed in a fixed, orderly arrangement.

Question 6

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

Accepted Answer

The boiling point of ethanol is $$78.4\ ^\circ\mathrm{C}.$$

Question 7

A patient receives 500 mL of a saline solution. How many liters is this?

Accepted Answer

$$0.5\ \mathrm{L}$$

Question 8

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 9

How many protons, neutrons, and electrons are present in $$^{23}_{11}\mathrm{Na}$$?

Accepted Answer

11 protons, 12 neutrons, 11 electrons

Question 10

Which of the following elements is a noble gas?

Accepted Answer

Argon

Question 11

Which of the following ions has the same number of electrons as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na}^+$$

Question 12

What is the formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$$\mathrm{MgCl}_2$$

Question 13

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 14

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 15

A nutrition label states that a food contains 200 Calories (Cal). How many joules (J) is this? ($$1\ \mathrm{Cal} = 4.184\ \mathrm{kJ})$$

Accepted Answer

$$836,800\ \mathrm{J}$$

Question 16

Which of the following statements about electrolytes is correct?

Accepted Answer

Electrolytes are substances that conduct electricity when dissolved in water.

Question 17

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

Metals have loosely held valence electrons that can move freely.

Question 18

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Question 19

How many valence electrons are present in a phosphorus atom ($$\mathrm{P}$$, atomic number 15)?

Accepted Answer

5

Question 20

Which of the following best describes the difference between kinetic and potential energy?

Accepted Answer

Kinetic energy is energy of motion, while potential energy is stored energy.

GOB Chemistry Study Guide: Measurement, Matter, Atomic Structure, and Chemical Bonding

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