Rates of chemical reactions

Question 1

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Answer 1

• the particles must collide
• the particles must collide with an energy equal to or higher than he activation energy
• the particles must collide with the correct orientation.

Question 2

Factors affecting reaction rate

Concentration of reactants

Answer 2

Increased reactants= more collisions= greater reaction rate

Question 3

Factors affecting reaction rate

Surface area (solids and liquid reactants)

Answer 3

Increasing SA increases the contact of the reactants to other reactants and therefore increases the frequency of collisions between reactants= greater reaction rate.

Question 4

Factors affecting reaction rate

Catalysts

Answer 4

A catalyst is a substance that offers an alternative reaction pathway with a lower activation energy. Therefore more collisions will have an energy equal to or above the activation energy= more successful collisions=greater reaction rate.

Question 5

Factors affecting reaction rate

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Answer 5

• Increased temp will imply that particles move faster therefore they will collide more frequency
• Since they are smashing into each other harder there average kinetic energy will be higher = more collisions will have energy equal to or above the activation energy= more successful collisions

Question 6

Maxwell- Boltzman distribution curve

Temperatue

Answer 6

Expect a large area of curve to spam a higher kinetic energy ie a bell shape.

Question 7

Maxwell- Boltzman distribution curve

Catalyst

Answer 7

Activation energy is lower (Ea with cat is higher up)