Factors Affecting Rate Of Reaction

Question 1

5 factors

Answer 1

1. Conc of solutions
2. Pressure of gases
3. Particle size
4. Temp
5. Catalyst

Question 2

Describe conc of solution

Answer 2

• Conc increase, the no of rxt particles per unit volume increases
• frequency of collisions increase

=> frequency of effective collisions bt rxt particles increase

Question 3

Describe pressure of gas

Answer 3

• pressure increases, no of gaseous rxts particle per unit volume increases
• frequency of collision increase
• frequency of effective collisions bt rxt particles increase

Question 4

Describe particle size

Answer 4

• particle size of solid decreases, no of sites of rn increases
• frequency of collisions increase

=> frequency of effective collisions bt rxts particles increase

Question 5

Describe temp

Answer 5

1. Molecular speed of rxt particles increase
   -higher frequency of collisions
   => higher frequency if effective collisions
2. Rxt particles have higher KE
   - a greater fraction of particles will have min. energy for the rn to take place
   - > higher frequency of collisions

Question 6

At higher temp, how to draw the maxwell graph?

Answer 6

1. Peak is lower and shift to the right

2. Tail end is higher

Question 7

Define catalyst

Answer 7

Sub that increases the rate of a rn by providing an alternate reaction pathway of lower Ea

• remains chemically unchanged
• increase rn rate

Question 8

Explain the use of cat

Answer 8

1. Provide alternative pathway of lower Ea
   - greater fraction of rxt particles have min Ea req for the rn to take place
   - > frequency of effective collisions increase
2. [rxts] remain constant
   - increase in rate constant

Question 9

3 types of cat

Answer 9

1. Homologous
   - same physical state as rxts
2. Heterogeneous
   - cat different physical state from rxts
3. Auto
   - pdts act as a catalyst

Question 10

What are

1. Intermediates
2. Catalyst

Answer 10

1. Formed in earlier steps but used up in later steps
   - does not appear in overall step
2. Used up in earlier step but formed in later Sep