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Writing/reading Chemical Equations Chemists use chemical equations describe what reactions are taking place by writing an equation Word equations are a simple list of: 1) reactant(s) 2) product(s) Rules of word equations: 2) reactant(s) are always to the LEFT 3) 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
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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…