Question 1

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

Accepted Answer

They have a complete octet of valence electrons, making them stable.

Question 2

How many electrons can be held in the third energy level ($$n = 3) of an $$atom?

Accepted Answer

$$18$$

Question 3

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$Na^+$$

Question 4

What is the formula for the ionic compound formed between aluminum and oxygen?

Accepted Answer

$$Al_2O_3$$

Question 5

Which of the following best describes the process by which sodium and chlorine form an ionic bond?

Accepted Answer

Sodium transfers one electron to chlorine, forming $$Na^+$$ and $$Cl^-$$ ions that attract each other.

Question 6

What is the correct name for the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following is a polyatomic ion commonly found in antacids and also helps control acid–base balance in blood?

Accepted Answer

Hydrogen carbonate ($$HCO_3$$^-$$)

Question 8

How many covalent bonds does a nitrogen atom typically form to satisfy the octet rule?

Accepted Answer

$$3$$

Question 9

Which of the following compounds is covalent?

Accepted Answer

$$CO_2$$

Question 10

What is the correct name for the compound $$N_2O_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 11

A patient is prescribed calcium carbonate as an antacid. What is the formula for calcium carbonate?

Accepted Answer

$$CaCO_3$$

Question 12

Which of the following best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds are formed from metals and nonmetals, while covalent compounds are formed from only nonmetals.

Question 13

What is the charge on the ion formed by a Group 6A element?

Accepted Answer

$$2-$$

Question 14

Which of the following is the correct Lewis structure for methane ($$CH_4$$)?

Accepted Answer

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

Question 15

Which of the following formulas represents a binary ionic compound?

Accepted Answer

$$MgCl_2$$

Question 16

A compound contains only nitrogen and hydrogen. Which of the following is the correct name for $$NH_3$$?

Accepted Answer

Ammonia

Question 17

Which of the following ions is responsible for regulating fluids outside cells and is commonly found in table salt?

Accepted Answer

$$Na^+$$

Question 18

What is the correct formula for the compound formed between magnesium and nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 19

Which of the following best describes the bonding in $$O_2 ($$oxygen gas)?

Accepted Answer

A double covalent bond between two oxygen atoms.

Question 20

Which of the following is the correct name for $$P_2O_5$$?

Accepted Answer

Diphosphorus pentoxide

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

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