4.1 Evidence of a chemical reaction Flashcards
1
Q
Chemical reaction
A
takes place when two or more substances combine to form a new substance
2
Q
2 parts of a chemical reaction
A
Reactants
Products
3
Q
Reactants
A
The material present at the start of a reaction
4
Q
Products
A
the new materials produced by the reaction
5
Q
Evidence of a chemical reaction:
A
- all chemical reactions involve energy. 2. Energy is used to break bonds in reactants, and energy is used when new bonds form products. 3. In terms of energy there are two types of chemical reactions: Endothermic, Exothermic
6
Q
Exothermic reactions
A
- Release chemical energy 2. Tempature increases
7
Q
Endothermic Reactions
A
- Absorb chemical energy 2. tempature decreases
8
Q
The most common types of chemical reactions are those involving —
A
Oxygen
9
Q
Three examples of reactions in which oxygen reacts with other substances are
A
- combustion
- Corrosion
- Cellular Respiration
