Question 1

Which of the following statements best describes a polyatomic ion?

Accepted Answer

A group of atoms covalently bonded with an overall charge.

Question 2

What is the correct formula for aluminum bicarbonate, given that aluminum has a $$3+$$ charge and bicarbonate is $$\mathrm{HCO}_3^-$$?

Accepted Answer

$$\mathrm{Al(HCO}_3)_3$$

Question 3

Which compound is molecular and correctly named?

Accepted Answer

SO$$_3$$, sulfur trioxide

Question 4

What is the correct name for the molecular compound with the formula $$\mathrm{N}_2\mathrm{O}$$?

Accepted Answer

Dinitrogen oxide

Question 5

Which of the following is the correct formula for diphosphorus pentoxide?

Accepted Answer

$$\mathrm{P}_2\mathrm{O}_5$$

Question 6

A compound is named dinitrogen tetroxide. What is its formula?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

Question 7

Which of the following is an exception to the octet rule?

Accepted Answer

Sulfur hexafluoride ($$\mathrm{SF}_6)$$

Question 8

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

Accepted Answer

A central C atom with four single bonds to four H atoms, each H with no lone pairs.

Question 9

Which of the following compounds contains a polyatomic ion?

Accepted Answer

Mg(NO$$_3$$)$$_2$$

Question 10

What is the correct formula for sodium phosphate, given sodium is $$\mathrm{Na}^+$$ and phosphate is $$\mathrm{PO}_4$$^{3-}$$?

Accepted Answer

$$\mathrm{Na}_3\mathrm{PO}_4$$

Question 11

Which of the following is a diatomic molecule found in nature?

Accepted Answer

O$$_2$$

Question 12

A patient is prescribed aluminum hydroxide as an antacid. What is the formula for aluminum hydroxide?

Accepted Answer

$$\mathrm{Al(OH)}_3$$

Question 13

Which of the following is the correct name for $$\mathrm{SF}_6$$?

Accepted Answer

Sulfur hexafluoride

Question 14

What is the correct formula for iron(III) phosphate?

Accepted Answer

$$\mathrm{FePO}_4$$

Question 15

Which of the following best describes the process of forming a hydrogen molecule ($$\mathrm{H}_2$$)?

Accepted Answer

Two H atoms share a pair of electrons to achieve a noble gas configuration.

Question 16

Which of the following is the correct formula for dinitrogen trioxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_3$$

Question 17

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO}_2$$)?

Accepted Answer

A central C atom with two double bonds to two O atoms, each O with two lone pairs.

Question 18

Which of the following compounds is ionic?

Accepted Answer

Na$$_2SO$_4$$

Question 19

A fertilizer contains ammonium nitrate. Which ions are present in this compound?

Accepted Answer

NH$$_4^+$$ and NO$$_3^-$$

Ionic and Molecular Compounds: Polyatomic Ions, Naming, and Lewis Structures

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