Question 1

Which subatomic particle is primarily responsible for the chemical properties of an element?

Accepted Answer

Electron

Question 2

What is the correct Lewis symbol for a sulfur atom?

Accepted Answer

S with 6 dots around it

Question 3

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Question 4

A sample of ice at 0°C absorbs 334 J of heat. How many grams of ice melted? (Heat of fusion for water is $$334 \ \frac{J}{g})$$

Accepted Answer

$$1 \ g$$

Question 5

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 6

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

Accepted Answer

Al$$_2O$_3$$

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning a candle

Question 8

Convert 25°C to Fahrenheit using the formula $$T_F = 1.8(T_C) + 32.$$

Accepted Answer

$$77 \ ^\circ F$$

Question 9

Which of the following ions is correctly paired with its name?

Accepted Answer

Cl$$^-$$, chloride ion

Question 10

What is the name of the compound Fe$$_2(SO$_4$$)$$_3$$?

Accepted Answer

Iron(III) sulfate

Question 11

Which of the following phase changes is exothermic?

Accepted Answer

Condensation

Question 12

What is the correct formula for ammonium phosphate?

Accepted Answer

(NH$$_4$$)$$_3PO$_4$$

Question 13

Which of the following bonds is considered nonpolar covalent?

Accepted Answer

Cl-Cl

Question 14

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

Accepted Answer

N$$_2O$_4$$

Question 15

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms gain, lose, or share electrons to achieve 8 valence electrons.

Question 16

How many valence electrons does phosphorus have?

Accepted Answer

5

Question 17

Which of the following is the correct name for SO$$_3$$?

Accepted Answer

Sulfur trioxide

Question 18

What is the charge on a nitride ion?

Accepted Answer

3−

Question 19

Which of the following is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 20

A sample of water at 100°C absorbs 2257 J of heat. How many grams of water are vaporized? (Heat of vaporization for water is $$2257 \ \frac{J}{g})$$

Accepted Answer

$$1 \ g$$

Unit 2 Study Guide: Ions, Ionic and Molecular Compounds, Changes of State, and Polyatomic Ions

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