Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture whose composition varies throughout.

Question 2

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

Accepted Answer

Elements in the same group have the same number of valence electrons.

Question 3

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 4

A sample of gold has a mass of 96.5 g and a volume of 5.00 mL. What is its density?

Accepted Answer

$$19.3\ \mathrm{g/mL}$$

Question 5

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

Accepted Answer

Burning wood to form ash and gases.

Question 6

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 7

Which of the following is the correct conversion factor to convert 250 milliliters to liters?

Accepted Answer

$$\frac{1\ \mathrm{L}}{1000\ \mathrm{mL}}$$

Question 8

A nurse needs to administer 500 mg of a medication. The available tablets are 250 mg each. How many tablets should the nurse give?

Accepted Answer

2 tablets

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 10

Which of the following is the correct symbolic notation for an atom of sodium with 11 protons and 12 neutrons?

Accepted Answer

$$^{23}_{11}\mathrm{Na}$$

Question 11

Which of the following best describes the octet rule?

Accepted Answer

Atoms are most stable when they have eight electrons in their valence shell.

Question 12

What is the charge on an ion formed by an atom in Group 6A (16) of the periodic table?

Accepted Answer

$$2-$$

Question 13

Which of the following is the correct name for the compound $$\mathrm{Fe}_2(\mathrm{SO}_4)_3$$?

Accepted Answer

Iron(III) sulfate

Question 14

Which of the following is a property of metals on the periodic table?

Accepted Answer

They are generally good conductors of heat and electricity.

Question 15

How many electrons can occupy the third energy level (n = 3) of an atom?

Accepted Answer

18

Question 16

Which of the following is the correct Lewis structure for methane ($$\mathrm{CH}_4$$)?

Accepted Answer

A central C atom with four single bonds to four H atoms.

Question 17

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250.0 mL of solution. What is the percent (w/v) concentration of NaCl?

Accepted Answer

$$2.00\%$$

Question 18

Which of the following statements about specific heat is correct?

Accepted Answer

Specific heat is the amount of heat needed to raise the temperature of 1 g of a substance by 1°C.

Question 19

Which of the following is the correct formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$$\mathrm{MgCl}_2$$

Question 20

A patient’s body temperature is measured as 39.0°C. What is this temperature in Fahrenheit?

Accepted Answer

$$102.2^\circ\mathrm{F}$$

GOB Chemistry Study Guide: Matter, Measurement, Atoms, and Compounds

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