Chemical Reaction Rates

Question 1

What Factors Influence Chemical Reaction Rates?

Answer 1

1. Physical Nature of Reactants
2. Reactant Concentration
3. Reaction Temperature
4. Catalysts

Question 2

What phases react the fastest?

Answer 2

Gas > Liquid > Solid

Question 3

Reactant Concentration & Rate of Collisions

Answer 3

> Reactant Concentration = > Molecules = > Collision Rates = > Rate of Reaction

Question 4

Reaction Temperature & Rate of Collisions

Answer 4

> Temperature = > Average Kinetic Energy = > Collision Rates = > Reaction Rate

Question 5

Catalysts & Collision

Answer 5

Catalysts prove an alternative reaction pathway that requires lower activation energy for reaction to occur.

> Catalysts = > Rate of Reaction

Question 6

What is the Activation Energy?

Answer 6

Activation Energy is the minimum amount of energy required (must be provided) for chemical reaction to occur.

Question 7

How does Orientation affect Chemical Reaction?

Answer 7

Some reactions require reactant particles to be in a specific orientation for them to collide effectively.

Question 8

How can you determine whether a reaction is Endothermic or Exothermic ? (Formula)

Answer 8

Positive Change in H = Endothermic Reaction

Negative Change in H = Exothermic Reaction

Question 9

Formula for Heat of Reaction

Answer 9

q (heat energy) = mass (g) * s (heat capacity; J/g degree C) * change in temperature

Change in H = -q/m