Collision Theory and The Rate of Chemical Reaction

Objectives

define collision theory and describe how it affects the chemical

reaction; and

explain the different factors affecting the rate of reaction.

1

3

2

Describe the concept of catalyst ; and

4
Realize the importance of catalyst and how it affects

your life.

Chemical or Physical change

Identify the type of change that it describe in each item..

Dropdown

What kind of change?

Mixing paint to make new color.

​

Select answer

Dropdown

What type of change?

Burning of woods to creat bonfire

Select answer

Dropdown

What type of change?​

​

Dissolving sugar to coffee. ​

Select answer

Dropdown

What type of change?

Baking bread​

Select answer

Open Ended

What are your ideas about the picture?

Audio Response

Share your thoughts !

Open Audio Recorder

Audio Response

What can you infer in the picture?

Complete the statement

Reactions is ____________

Open Audio Recorder

Analyze the illustration below:

• in contact with / collide

• enough activation energy

• correct orientation

​Collision Theory

Collision Theory

• Substances or

particles of reactants
must physically
collide with enough
energy

2. Substances or particles
must come into contact or
collide in the correct
orientation.

Collision theory states that reacting substance must come
into contact (collide) with enough activation energy, and in
correct orientation(facing the correct way.

What is Chemical Reaction?

reactants

products

1. Activation Energy

minimum energy required for a reaction to take

place.

Factors Affecting the Rate of

Chemical Reaction

2. Temperature

average kinetic energy of the particles in an object

Factors Affecting the Rate of

Chemical Reaction

Watch this Video

Simple Experiment on how temperature affect

the rate of reaction

Materials:

2 clear glasses

Hot water

Cold water

2 tablets of Ascorbic acid

3. Concentration

refers to the number of particles present in a given volume of solution

Factors Affecting the Rate of Chemical Reaction

Watch this Video

Simple Experiment on how concentration affect

the rate of reaction

Materials:

3 clear glasses

water

Hydrogen peroxide

Dishwashing liquid

yeast

4. Surface Area and Particle Size

refers to the measure of how much exposed area a solid object has, expressed in square unit area.

Factors Affecting the Rate of Chemical Reaction

• How many reactant particles can be seen

on Figure A?

• Which do you think is the solid particle on

figure A?

• What have you observed to the reactant

particles in figure B?

• In which container will the solid particle

dissolve faster and Why? Figure A of Figure B?

Watch this Video

Simple Experiment on how surface area affect

the rate of reaction

Materials:

2 clear glasses

water

2 tablets of ascorbic acid

5. Catalyst

A substance which speeds up a reaction, but is chemically unchanged at its end.

Factors Affecting the Rate of Chemical Reaction

https://images.app.goo.gl/dTcS8R3mQ48BQjJJ8

https://images.app.goo.gl/C9Bs58GHjqkFiMSj7

The Importance of Activation Energy

Watch this Video

Simple Experiment on how Catalyst affect the

rate of reaction

Materials:

2 clear glasses

yeast

Hydrogen peroxide

Comprehension Questions

Use your knowledge about collision theory and the factors

affecting the rate of chemical reactions.

Question 1

Use the collision theory to explain why a lump of sugar is better

to use in hot cup of tea, but granulated sugar is better to use in

iced tea.

Question 2

Suppose you held a lighted match to a solid piece of wood and

another match a file of wood shavings. Which form of wood

would catch fire more easily and why?

Multiple Choice

What conditions must be met in order for a chemical reaction to occur?

• Collision with proper oreintation

• Sufficient activation energy

• Adding more reactant particles

• Both collision with proper orientation and sufficient energy

Multiple Choice

Which of the following would NOT increase the rate of reaction?

• Increasing the temperature

• Adding catalyst

• Increasing the volume

• Increasing the concentration

Multiple Choice

Suppose you dissolve Zinc(Zn) in Hydrochloric acid (HCl) and add more acid than usual. Then drop pieces of Zinc. What factors doe NOT affect the rate of the reaction?

• Surface area of Zinc

• Concentration of the reactant

• Temperature of the solution

• Amount of Hydrochloric acid

Multiple Choice

Activation energy is the amount of energy required to _____

• Break the bonds between the reacting molecules

• Make the reacting particles collide

• Form the bonds between the product molecules

• Convert the reactant to a single product

Multiple Choice

Why does a candle burn more rapidly when placed in an open jar than in air? What accounts for this reaction?

• Higher oxygen concentration

• Greater surface area of jar

• Increasing the surrounding temperature

• Length of the candle

Dropdown

Identify what factor affect the rate if chemical reaction in the following situations.



The food was refrigerated.​

Select answer

Dropdown

Identify what factor affect the rate if chemical reaction in the following situations.



A coal dust explosion happen in miners.​ ​

Select answer

Dropdown

Identify what factor affect the rate if chemical reaction in the following situations.



Acid rain errodes marble fast.​ ​

Select answer

Dropdown

Identify what factor affect the rate if chemical reaction in the following situations.



Two antacid tablets neutralizes acids faster than one tablet.​ ​

Select answer

Dropdown

Identify what factor affect the rate if chemical reaction in the following situations.



Kindling is used to start a fire.​ ​

Select answer

Comprehension Questions

Question 3

Just like the catalysts explained in science, there are also some factors that may
affect us to grow or hinder our rate of success.

It may include your family, friends, opportunities, or your personality.
Will you share it with me? Who/What are the influencers in your life?

Summary of Today's Class

Recap 1

Collision theory states that reacting
substances must come into contact
with enough activation energy, and in
correct orientation

Recap 2
There are factors that affects the
rate of reaction
- Activation energy
- Temperature
- Concentration
- Surface area and particle size

Recap 3

Catalyst that helps in the
speeding up the rate of reaction.

Recap 4

Open Ended

Complete the statements

Chemical reaction ________________________

A catalyst _____________________________

Collision Theory ________________________

Open Ended

Share your opinion about the quotation.