Unit 2: Chemical Interactions
Chapter 6: Chemical Reactions
Big Idea: Chemical reactions are
processes in which atoms are
rearranged into different
combinations of molecules
4 Sections
1.
2.
3.
4.
Observing Chemical Change
Describing Chemical Reactions
Controlling Chemical Reactions
Fire & Fire Safety
Mrs. Lee - Ch 6
2
Sec 1: Observing Chemical
Change
KEY CONCEPTS
• Changes in matter can be described in terms of
physical changes & chemical changes
• Chemical changes occur when bonds break &
new bonds form
• Chemical reactions involve changes in properties
& changes in energy that you can observe
Mrs. Lee - Ch 6
3
Sec 1: Key Terms
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Matter
Chemistry
Physical property
Chemical property
Physical change
Chemical change
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Reactant
Product
Precipitate
Endothermic reaction
Exothermic reaction
Mrs. Lee - Ch 6
4
Sec 2: Describing Chemical
Reactions
KEY CONCEPTS
• Chemical equations use chemical formulas
& other symbols instead of words to
summarize a reaction
• In chemical reactions, the number of atoms
stays the same no matter how they are
arranged, so their total mass stays the same
Mrs. Lee - Ch 6
5
Sec 2: Describing Chemical
Reactions (cont’d)
• To describe a reaction accurately, a
chemical equation must show the same
number of each type of atom on both sides
of the equation
• 3 general types of chemical reactions are
synthesis, decomposition & replacement
Mrs. Lee - Ch 6
6
Sec 2: Key Terms
• Chemical equation
• Conservation of
matter
• Open system
• Closed system
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Coefficient
Synthesis
Decomposition
Replacement
Mrs. Lee - Ch 6
7
Sec 3: Controlling Chemical
Reactions
KEY CONCEPTS
• All chemical reactions require a certain
amount of activation energy to get started
• Factors that affect rates of reaction include
surface area, temperature, concentration &
the presence of catalysts or inhibitors
Mrs. Lee - Ch 6
8
Sec 3: Key Terms
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Activation energy
Concentration
Catalyst
Enzyme
Inhibitor
Mrs. Lee - Ch 6
9
Sec 4: Fire & Fire Safety
KEY CONCEPTS
• The following 3 things are necessary to
start & maintain a fire: 1) fuel
2) oxygen
3) heat
• If you know how to prevent fires in your
home & what to do if a fire starts, you are
better prepared to take action
Mrs. Lee - Ch 6
10
Sec 4: Key Terms
• Combustion
• Fuel
Mrs. Lee - Ch 6
11