Question 1

Which subatomic particle is primarily responsible for the chemical properties of an element, and where is it located in the atom?

Accepted Answer

Electron; in the electron cloud

Question 2

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Question 3

A sample of ice at 0°C is melted using 200 grams of ice. How much heat (in calories) is required? (Heat of fusion for water is $$79.7 \ \frac{cal}{g})$$

Accepted Answer

$$15940 \ cal$$

Question 4

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 5

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

Accepted Answer

Al$$_2O$_3$$

Question 6

Which of the following is a chemical change?

Accepted Answer

Burning a piece of paper

Question 7

A patient’s temperature is measured at 39.0°C. What is this temperature in Fahrenheit? (Use $$T_F = 1.8T_C + 32)$$

Accepted Answer

$$102.2^\circ F$$

Question 8

Which of the following best describes the bonding in a molecule of N$$_2$$?

Accepted Answer

A triple covalent bond

Question 9

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

Accepted Answer

Iron(III) sulfate

Question 10

Which of the following statements about the periodic table is correct?

Accepted Answer

Group 2A elements form 2+ cations

Question 11

Which of the following is the correct name for P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 12

Which of the following phase changes is exothermic?

Accepted Answer

Condensation

Question 13

What is the formula for ammonium phosphate?

Accepted Answer

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

Question 14

Which of the following bonds is considered nonpolar covalent based on electronegativity differences?

Accepted Answer

Cl–Cl

Question 15

A compound is found to contain only potassium and bromate ions. What is its correct formula?

Accepted Answer

KBrO$$_3$$

Question 16

Which of the following is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 17

Which of the following best describes the difference between physical and chemical changes?

Accepted Answer

Physical changes do not alter the identity of a substance, chemical changes produce new substances

Question 18

What is the correct name for SO$$_3$$?

Accepted Answer

Sulfur trioxide

Question 19

Which of the following is the correct formula for iron(II) nitrite?

Accepted Answer

Fe(NO$$_2$$)$$_2$$

Question 20

A sample of water is heated from 25°C to 100°C. Which phase change occurs at 100°C under normal pressure?

Accepted Answer

Boiling

Unit 2 Study Guide: Physical and Chemical Changes, States of Matter, Ions, Ionic and Molecular Compounds

Study Guide - Practice Questions

Study Guide - Flashcards