Chp 5 Sec 4 Guided Notes
Rates of Change
For a grade
Name:_____________________________
1. Chemical reactions can occur at different ________________or rates.
2. Many factors can affect the rates of reactions
*6 Factors Affecting Reactions
1. Temperature
2. ____________________
3. Concentrations
4. Pressure
5. ___________________
6. Catalysts
Temperature:
7. Most reactions go ______________at higher temperatures
8. Example: A potato slice cooks faster in hot oil than in boiling water.

Heating food______________ up chemical reactions

Increased speed of particles increases chances for particles to_______________& react.
Surface Area:
9. A____________________ surface area speeds up reactions
10. An object with a large surface area reacts more rapidly because more particles can come into contact with the
other reactants.
Concentration:
11. Concentrated solutions react faster
12. Higher concentration ______________________the chance for particles to collide and react.
Pressure:
13.
Reactions are quicker at _______________________pressure

Example:
◦
Gases react________________ at higher pressures, the particles have less space to move and therefore
have more collisions.
Molecule Size:
1. The size & shape of the reactant molecules affect the rate of reaction.
2. Massive, bulky molecules react____________________
Catalysts:
3. Catalysts can speed up or slow down chemical reactions
4. Catalysts are not reactants or _____________________
5. Catalysts that slow chemical reactions are called_______________________.

Ex. Enzymes  Biological _________________
Le Chatelier’s principle predicts changes in_______________________.

If a change is made to a system in a chemical equilibrium, the equilibrium shifts to
______________________the change until a new equilibrium is reached. (shifting “left” or “right”)

If the temperature is increased, the reaction at equilibrium will shift to the left

In the direction that absorbs energy.

If the pressure is increased, the reaction will shift to the __________________ and reduce the pressure.
Practice Balancing:
_____ K + _____ Br2  _____ KBr
_____ C7H16 + _____ O2 _____ CO2 + _____ H2O
_____ P4 + _____ O2 _____ P2O5
_____ FeS2 + _____ O2  _____ Fe2O3 + _____ SO2
_____ Al + _____ FeO _____ Al2O3 + _____ Fe