1. Atoms are __________________________ (NOT created or destroyed)
Chemical Reactions
CHEMICAL REACTIONS
Occur when substances undergo chemical changes to form _______________________________.
Atoms are __________________________ (NOT created or destroyed)
Parts of a Reaction
____________________________
Substance or molecule that participates in a chemical reaction.
On ___________________ side of arrow in chemical equation
Substance that forms in a chemical reaction.
2H2 + O2  2H2O
(Reactants) (Products)

2. CHEMICAL BONDS BETWEEN ATOMS (Ionic and Covalent)
Chemical Reactions
CHEMICAL BONDS BETWEEN ATOMS (Ionic and Covalent)
Sometimes energy must be ___________ to ______________ bonds.
____________________________________= energy required to begin or finish a reaction
Many forms of energy can be used to break bonds such as heat, light, electricity, and sound.
Often forming bonds __________________________ energy (like explosions).

4. CONSERVATION OF ENERGY AND MASS
Chemical Reactions
CONSERVATION OF ENERGY AND MASS
Mass and energy are ______________________ in chemical reactions.
The total energy and mass that exists before the reaction is equal to the total energy and mass of the products and their surroundings.
HEAT AND CHEMICAL REACTIONS
________________________ reaction = chemical reaction in which heat is released to the surroundings.
________________________ reaction = chemical reaction that absorbs heat.

5. Chemical Reactions
SPEED OF A REACTION
__________________________ = substance that changes the ______________________________ _____________________________ without being consumed or changed significantly.
Catalysts are _____________ reactants or products, because they are not used up in the reaction.
Catalysts are often used in industry to make reactions go faster.
Catalysts in your body are called
__________________________

6. ____________________ Reaction
Chemical Reactions
____________________ Reaction
Two or more substances _____________________ to form a new compound.
Synthesis reactions have the following general form:
A + B AB
Example:
2Na + Cl22  2NaCl
____________________ Reaction
A single compound _____________________ to form two or more simpler substances.
Decomposition reactions have the following general form:
AB  A + B
Example:
2H2O  2H2 + O2

7. # 3 Reaction
#4 Reaction
Chemical Reactions
_______________________ _______________________ Reaction
____________ element or ion _________________________ of another element or ion in the compound.
Single-displacement reactions have the following general form:
AX + B  BX + A
Example:
3CuCl2 + 2Al  2AlCl3 + 3Cu
________________________ ________________________ Reaction
A gas, a solid precipitate, or a molecular compound forms from the apparent __________________________ __________________________ between _______ compounds.
Double-displacement reactions
have the following general form:
AX + BY  AY + BX
Example:
Pb(NO3)2 + K2CrO4  PbCrO4 + 2KNO3

8. _______________________ Reaction
Chemical Reactions
_______________________ Reaction
The reaction of a carbon-containing compound, in which _______________________________.
Combustion reactions use O2 as a reactant.
H2O and CO2 is a common product of combustion reactions.
Example: CH4 + O2  CO2 + 2H2O + heat