Question 1

Which of the following statements best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell with eight electrons, making them stable according to the octet rule.

Question 2

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

Accepted Answer

$$\mathrm{Mg_2N_3}$$

Question 3

How many protons and electrons are present in an $$\mathrm{O$$^{2-}$$}$$ ion?

Accepted Answer

8 protons, 10 electrons

Question 4

Which of the following compounds is named correctly?

Accepted Answer

CO: carbon monoxide

Question 5

What is the molecular shape of ammonia ($$\mathrm{NH_3$}) $$according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 6

Which of the following best describes the bond in a molecule of $$\mathrm{H_2O}$$?

Accepted Answer

Polar covalent

Question 7

Calculate the mass in grams of 3.00 moles of $$\mathrm{CO_2$}$$ ($$\mathrm{C}$$: 12.01 g/mol, $$\mathrm{O}$$: 16.00 g/mol).

Accepted Answer

$$132.03 g$$

Question 8

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 9

What is the correct name for the compound $$\mathrm{CuO}$$?

Accepted Answer

Copper(II) oxide

Question 10

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 11

How many valence electrons does an atom of phosphorus ($$\mathrm{P}$$, Group 5A) have?

Accepted Answer

5

Question 12

Which of the following best describes the process of forming an ionic bond?

Accepted Answer

Electrons are transferred from a metal to a nonmetal.

Question 13

What is the molar mass of $$\mathrm{Ca(OH)_2}$$? ($$\mathrm{Ca}$$: 40.08 g/mol, $$\mathrm{O}$$: 16.00 g/mol, $$\mathrm{H}$$: 1.01 g/mol)

Accepted Answer

$$74.10 g/$$mol

Question 14

Which of the following compounds contains a transition metal that requires a Roman numeral in its name?

Accepted Answer

$$\mathrm{$$FeCl_3$$}$$

Question 15

Which of the following best describes the geometry of $$\mathrm{CH_4$}$$?

Accepted Answer

Tetrahedral

Question 16

A sample contains $$210$$ grams of carbon. How many moles of carbon are present? ($$\mathrm{C}$$: $$12.01 g/$$mol)

Accepted Answer

$$17.5$$ moles

Question 17

Which of the following is the correct Lewis structure for a molecule of $$\mathrm{Cl_2$}$$?

Accepted Answer

Each Cl atom shares one pair of electrons, with three lone pairs on each Cl.

Question 18

Which of the following best describes the polarity of the $$\mathrm{C-H}$$ bond?

Accepted Answer

Nonpolar covalent

Question 19

What is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 20

Which of the following statements about polyatomic ions is correct?

Accepted Answer

Polyatomic ions are groups of nonmetals that carry a charge as a unit.

Compounds—How Elements Combine: Chapter 3 Study Guide (GOB Chemistry)

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