1.5 Kinetics Flashcards

1
Q

What is the collision theory?

A

The particles of the reactants need to collide having frequent successful collisions above the activation energy

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2
Q

What is rate of reaction?

A

Frequency of collisions of the reactant particles at or above the activation energy

Resulting in a change in concentration of products or reactants over a given period of time

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3
Q

What must happen in order for a successful chemical reaction to take place?

A

Particles must:
Collide
Collide with enough energy
Collide with the correct orientation

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4
Q

The is the activation energy?

A

The minimum amount of energy particles must have to start a reaction

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5
Q

What factors affect rate of reaction?

A

Temperature*
Concentration
Surface area
Catalysts

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6
Q

How does temperature affect the rate of reaction?

A

It gives the particles more kinetic energy. The vibrate and move more at a greater force causing more frequent collisions above the activation energy. Increasing the rate of reaction

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7
Q

How does concentration affect the rate of reaction?

A

Higher concentration means there are more particles in a given volume therefore more opportunities for successful frequent collisions. This will increase the rate of reaction

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8
Q

How does surface area affect the rate of reaction?

A

A higher surface area means there are more particles exposed to the acid so there are more successful frequent collisions above the activation energy. This will increase the rate of reaction

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8
Q

Which has a higher surface area? Marble chips or Marble powder

A

Marble powder

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10
Q

What does a catalyst do?

A

It lowers the activation energy
By providing an alternative reaction pathway

Allowing more successful frequent collisions above the activation energy

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11
Q

What is a catalyst?

A

It speeds up a chemical reaction and doesn’t get used up

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12
Q

Are catalysts used up in a reaction? How can you tell?

A

No, they have the same mass at the start and end of the reaction

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13
Q

Are catalysts costly? Economical?

A

Expensive but economical as they don’t need replacing often

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14
Q

Why are catalysts important in industrial processes?

A

To reduce the energy which will reduce the costs and environmental impact

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15
Q

How can we link temperature to rate of reaction?

A

For every 10 degree increase the rate of reaction approximately doubles

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16
Q

What graphs can we use to show rates of reactions?

A

Maxwell-Boltzmann Distributions

17
Q

What are the labels on the Maxwell-Boltzmann Distribution graphs?

A

Number of particles - up the side

Energy- along the bottom

19
Q

What does the Maxwell-Boltzmann curve look like?

A

Very steep initially
Gradual decline

=asymmetrical

20
Q

What is the highest peak on the Maxwell-Boltzmann curve?

A

The most probable energy a particle will have as it is the most frequent i.e mode

21
Q

What are some factors of the Maxwell-Boltzmann curve?

A

The area under the curve represents the total number of particles in the sample
The curve starts at the origin
The curve never touches the bottom x axis again = asymptote

22
Q

Why does the Maxwell-Boltzmann curve never touch the x axis after the start?

A

That would imply the particles have a finite amount of energy but particles have the potential for an infinite amount of energy