Do Now:
What
is a chemical reaction?
What is a reactant?
What is a product?
Why do substances react
with each other?
Equation
“Sentence”
that represents a
chemical reaction
Reactants
Products
Magnesium metal reacts with nitrogen
gas to produce solid magnesium nitride
Word Equation:
Magnesium + Nitrogen  Magnesium nitride
Plus “+” separate substances on each side
Yield “” separates reactants from
products
Magnesium metal reacts with nitrogen
gas to produce solid magnesium nitride
Chemical Equation:
Magnesium + Nitrogen  Magnesium nitride
Mg(s)+ N2(g)  Mg3N2(s)
Magnesium metal reacts with nitrogen
gas to produce solid magnesium nitride
Balanced Chemical Equation:
Magnesium + Nitrogen  Magnesium nitride
3 Mg(s) + N2(g)  Mg3N2(s)
Must satisfy the law of
conservation of matter!!!
Balance
equations to satisfy the
Law of Conservation of Matter
Use
coefficients to balance
equations
Indicate
phases (s – l – g – aq)
Use your ion sheet to write formulas for the following
compounds. Then balance each chemical equations
using coefficients.
1.
2.
3.
Solid Iron (III) chloride reacts with
aqueous sodium hydroxide to form solid
iron (III) hydroxide and aqueous sodium
chloride
Solid Iron (III) oxide reacts with
hydrogen gas to produce solid iron and
liquid water
Sodium bicarbonate, is heated to
produce sodium carbonate, carbon
dioxide, and water.
Yesterday we looked at the following reactions:
3Mg(s) + N2(g)  Mg3N2(s)
FeCl3(s) + 3NaOH(aq) Fe(OH)3(s) + 3NaCl(aq)
What is happening in each reaction?
Fe2O3(s) +3 H2(g) 2Fe(s) +3H2O(l)
2NaHCO3(s) Na2CO
3(s)
+ CO2(g) + H2O(l)
5 Basic types of chemical reactions
 Combination
- Reactants combine to
form 1 product
- 1 Reactant produces 2
or more products
 Decomposition
 Single-Replacement
-
A +BC -> B + AC
 Double-Replacement
-
AB +CD -> AD + CB
 Combustion-
CxHy + O2 -> CO2 + H2O
Write a balanced chemical
equation for …
 Copper
metal is dropped into a
solution of silver nitrate
•Single Replacement –
AB + C  CB + A (C is a metal)
AB + C  AC + B (C is a nonmetal)
Write a balanced chemical
equation for …
 Lead
II nitrate and sodium iodide
•Double Replacement –
AB + CD  AD + CB
•A change must take place, such as
precipitation, formation of pure liquid,
or evolution of gas
Write a balanced chemical
equation for …
 The
combustion of propane, C3H8
(oxygen is required!)
•Combustion –
hydrocarbon + O2  CO2 + H2O
•hydrocarbon – a molecular
compound containing C and H
and possibly O