Question 1

Which of the following statements best explains why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 2

A sample of carbon contains both $$^{12}\mathrm{C}$$ and $$^{14}\mathrm{C}$$ isotopes. Which statement is true about these isotopes?

Accepted Answer

They have the same number of protons but different numbers of neutrons.

Question 3

Which of the following compounds is correctly named according to ionic compound naming rules?

Accepted Answer

MgO: magnesium oxide

Question 4

What is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 5

Which of the following molecules is nonpolar due to its molecular geometry?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

A 2.0 M solution of NaCl is diluted to 0.50 M. If the original volume was 40 mL, what is the final volume after dilution?

Accepted Answer

$$160\ \mathrm{mL}$$

Question 7

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 8

How many valence electrons are present in a nitrogen atom?

Accepted Answer

5

Question 9

Which of the following best describes the bonding in $$\mathrm{NH_3$} ($$ammonia)?

Accepted Answer

Covalent bonding with a trigonal pyramidal geometry

Question 10

A student needs to prepare 250 mL of a 0.10 M $$\mathrm{Na_2SO_4}$$ solution from a 1.0 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$25\ \mathrm{mL}$$

Question 11

Which of the following molecules has a bent molecular geometry?

Accepted Answer

$$\mathrm{H_2O}$$

Question 12

What is the molar mass of $$\mathrm{CO_2$}$$?

Accepted Answer

$$44\ \mathrm{g/mol}$$

Question 13

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation has lost electrons, while an anion has gained electrons.

Question 14

Which of the following is the correct Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

O=C=O with double bonds and all atoms obeying the octet rule

Question 15

Which of the following compounds is named using prefixes?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

A sample contains $$8.8\ \mathrm{g} of$$ $$\mathrm{CO_2$} ($$molar mass $$= 44\ \mathrm{g/mol}). $$How many moles of $$\mathrm{CO_2$}$$ are present?

Accepted Answer

$$0.2\ \mathrm{mol}$$

Question 17

Which of the following best describes the bond in $$\mathrm{NaCl}$$?

Accepted Answer

Ionic bond formed by transfer of electrons

Question 18

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 19

Which of the following best explains why $$\mathrm{H_2O} is a $$polar molecule?

Accepted Answer

It has a bent shape and unequal sharing of electrons.

Question 20

Which of the following is the correct formula for potassium nitride?

Accepted Answer

$$\mathrm{K_3N}$$

General Chemistry Exam Master Study Guide: Atomic Structure, Bonding, and Molecular Geometry

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