Chemical Reactions + Chemical Energetics

Question 1

Def Rates of reactions

Answer 1

Change in concentration per unit time of either the product or the reactants

Question 2

Temperature

Answer 2

• As the temperature INCREASES, particles gain kinetic energy and move faster resulting in…
• more collisions per second+More of the colliding particles have sufficient energy to react

Question 3

Concentration (affecting the rates of reactions)

Answer 3

The higher the concentration, the more particles per unit volume resulting in more effective collisions per unit time and FASTER REACTION RATE

Question 4

Catalyst

Answer 4

• Increases rate of reaction by…
• Decreasing the activation energy required resulting in…
• More collisions will be effective as more molecules collide with sufficient activation energy ( equal to or greater than)

Question 5

Surface area

Answer 5

• Smaller the particle size— greater the surface area
• More surface is exposed for reaction to take place resulting in more EFFECTIVE COLLISIONS unit time

Question 6

Pressure

Answer 6

(Only in gas)
- When you increase the pressure by decreasing the volume, it reduces the amount of space in which the particles can move resulting in…
- more effective collisions per unit time and faster reaction