Chapter 6 - 8

Question 1

4 pieces of evidence that suggest a chemical reaction may have occurred when reactants are mixed

Answer 1

1. a colour change
2. formation of a solid
3. formation of gas
4. heat is produced or formed

Question 2

4 driving forces that make a reaction happen

Answer 2

1.Formation of a solid
2. Formation of water
3. Transfer of electrons
4. Formation of gas

Question 3

define salt in an acid-base reaction

Answer 3

The result of a strong acid and based being mixed to produce salt

Question 4

define strong acid in an acid-base reaction

Answer 4

A substance that produces H+ ions

Question 5

define strong base in an acid-base reaction

Answer 5

A substance that produces OH(-) ions in solutions

Question 6

explain what is meant by an “oxidation-reduction” reaction

Answer 6

Oxidation reduction is the transfer of electrons that involves a metal and a nonmetal. The presence of oxygen is a sign of an oxidation-reduction reaction between nonmetals.

Question 7

define atomic mass unit

Answer 7

1 amu = 1.66x10^-24

Question 8

define mole

Answer 8

The number equal to the number of atoms in an element

Question 9

define molar mass

Answer 9

the number equal to its amu

Question 10

define Avogadro’s number

Answer 10

6.022x10^23

Question 11

explain the difference between the empirical and molecular formula of a compound

Answer 11

The empirical formula represents the reduced ratio of elements in a compound and the molecular formula represents the actual number of atoms in a molecule

Question 12

molecular equation

Answer 12

Shows the complete formulas of all reactants and products

Question 13

Complete ionic equations

Answer 13

Contains all the individual ions including spectator ions

Question 14

Net Ionic equation

Answer 14

Includes components only directly involved in the reaction. No spectator ions

Question 15

How to determine precipitate

Answer 15

The solid compound must have a zero net charge