What is a chemical reaction?

chemical reaction-when one or more substances changes into one or more new substances

Two important key terms in a chemical reaction:1) reactants-

2) products-

the substance(s) that undergo change

the new substance(s) that are formed

Reactant + Reactant ----> Product

Writing/reading Chemical Writing/reading Chemical EquationsEquationsChemists use chemical equations describe

what reactions are taking place by writing an equationWord equations are a simple list of:

1) reactant(s) 2) product(s)Rules of word equations:

2) reactant(s) are always to the LEFT3) product(s) are always to the RIGHT

1) the reactants & products are separated by and arrow (means “yields”)

4) Use a + sign if there are more than one reactant or product

coefficient

H2 + O2 2H2O

subscript

yield

Multiply

Think of saying that there are TWO H2O’s

H2 + O2 2H2O Subscr

ipt TELLS 2 H’s

Coefficient x subscript

Subscript T

ELLS 2 O’s

TWO H2O’s = H2O + H2OAdding this way= 4 H’s and 2 O’s

1) What number represents the coefficient?2) What number represents the subscript?

4) What element is represented by the letter H?

3) How many “H’s” do you have?

52

Hydrogen

5x2=10

5H2

Answer a few questions about:

Most simple compounds only have 2words in their names

Naming Chemical formulas

Rules for simple compounds:

1. Write the 1st elements original name

2. Write the 2nd elements original name BUT change the suffix to “ide”

carbon + hydrogen=

sodium + chlorine =

aluminum + oxygen=

Naming Binary Compounds

Carbon hydroxide

sodium chloride

aluminium oxide

lithium+ oxygen=

beryllium+ nitrogen=

potassium + sulfur=

aluminum + chlorine=

Lithium + sulfur=

magnesium + sulfur=

You try…lithium oxide

beryllium nitride

potassium sulfide

aluminum chloride

lithium sulfide

magnesium sulfide

Naming Binary Compounds

Li + O=

Al + Br =

Ni + S =

Fe + O =

K + Cl =

lithium oxide

aluminum bromide

nickel sulfide

iron oxide

potassium chloride

Writing Binary CompoundsYou try…

Advanced Naming: Chart using chlorine

1) Carbon + (1) Oxygen =

(1) Carbon + (2) Oxygen =

(1) Carbon + (4) Chlorine =

Advanced Naming Continued

Carbon monoxide

Carbon dioxide

Carbon tetrachloride

You try…