Why does a catalyst increase the rate of reaction?

it reduces the activation energy of the reaction

it produces extra energy for the reactants

it increases the speed of the reactant particles

it increases the frequency of particle collisions

Why don't all collisions between particles cause a reaction?

not all the particles collide with enough energy

the particles also need to collide with a catalyst

not all the particles collide at a high enough temperature

the particles need to collide with each other twice

Why does a higher temperature increase the rate of a reaction?

it increases both the frequency and energy of particle collisions

it only increases the frequency of particle collisions

it only increases the energy of particle collisions

it reduces the activation energy of the reaction

How could we make this reaction happen more quickly?

crush the chalk to increase the surface area

Decrease the concentration of the acid

Put the test tube in an ice bath

Which 2 trials show the effect of temperature change on reaction rate, and what is the effect of increasing temperature?

3 and 6; rate increases as temperature increases

1 and 6; rate increases as temperature increases

2 and 6; rate decreases as temperature increases

4 and 6; rate decreases as temperature increases

Which 2 trials show the effect of a catalyst on reaction rate, and what is the effect of adding a catalyst?

1 and 5; rate increases when a catalyst is added

2 and 5; rate decreases when a catalyst is added

3 and 5; rate increases when a catalyst is added

4 and 5; rate decreases when a catalyst is added

Which 2 trials show the effect of increasing [C 2 O 4 -2 ] on reaction rate, and what is the effect of increasing [C 2 O 4 -2 ]?

1 and 2; rate increases (quadruples) when [C 2 O 4 -2 ] increases (doubles); thus C 2 O 4 -2 is a second order reactant

1 and 3; rate stays the same when [C 2 O 4 -2 ] increases; thus C 2 O 4 -2 is a zero order reactant

2 and 3; rate increases (quadruples) when [C 2 O 4 -2 ] increases (doubles); thus C 2 O 4 -2 is a second order reactant

1 and 4; rate increases when [C 2 O 4 -2 ] increases and is somewhere between second and third order

Which 2 trials show the effect of increasing [HgCl 2 ] on reaction rate, and what is the effect of increasing [HgCl 2 ]?

2 and 3; rate increases (quadruples) when [HgCl 2 ] increases (doubles); thus HgCl 2 is a second order reactant

1 and 3; rate stays the same when [HgCl 2 ] increases; thus HgCl 2 is a zero order reactant

3 and 4; rate increases when [HgCl 2 ] increases and is somewhere between second and third order

4 and 6; rate increases when [HgCl 2 ] increases and is somewhere between first and second order

Which 2 trials show the effect of increasing surface area on reaction rate, and what is the effect of increasing surface area?

2 and 4; rate increases as surface area increases

1 and 4; rate increases as surface area increases

3 and 4; rate increases as surface area increases

3 and 6; rate increases as surface area increases

What effect does chopping vegetables have on their cooking time and why? (using principles of collision theory)

Chopped vegetables have increased surface area and therefore take less time to cook

Chopped vegetables are at a higher temperature and therefore take less time to cook

Chopped vegetables have catalysts and therefore take less time to cook

Chopped vegetables are more concentrated and therefore take more time to cook

Collision theory and reaction rates

Authored by Thomas Gelsthorpe

Chemistry

10th - 11th Grade

NGSS covered

Used 193+ times

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21 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What criteria must be met for reactant collisions to result in a successful product?

The reactants must collide with each other

The reactants must collide with enough energy and be in the right positions

The reactants must have enough energy to form the activated complex

MULTIPLE CHOICE QUESTION

1 min • 1 pt

As a reaction proceeds, the concentration of reactants will _ and the concentration of products will __.

increase, decrease

increase, increase

decrease, decrease

decrease, increase

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions

True

False

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

More collisions correspond to a:

Faster reaction rate

Slower reaction rate

Constant reaction rate

None of the above

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Collisions may take place between:

Atoms

Ions

Molecules

All of the above

Tags

NGSS.HS-PS2-3

NGSS.HS-PS2-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which factors increase the rate of a reaction.

increasing temperature

increasing concentration

increasing surface area

all of these

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Increase in temperature of the reactants can do one of the following

Slow collision frequency

Allow less effective collision between the particles

Neutralise the reaction

increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

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Collision theory and reaction rates

What criteria must be met for reactant collisions to result in a successful product?

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions

More collisions correspond to a:

Collisions may take place between:

Which factors increase the rate of a reaction.

Increase in temperature of the reactants can do one of the following

Why does a catalyst increase the rate of reaction?

Which of the following increase the reaction rate?

Why don't all collisions between particles cause a reaction?

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Discover more resources for Chemistry

As a reaction proceeds, the concentration of reactants will _ and the concentration of products will __.