Introduction to Chemical Reactions

• Science
• Secondary Education
• Age 12,13

Burning

Lesson 1

How do you feel today?

😒🙁😐🙂😃

Getting familiar with Energy

• chemical energy
• light energy
• heat energy or thermal energy
• sound energy
• kinetic energy

Burning

Is it a chemical reaction?

When something burns, is it a chemical reaction?

YES

NO

Which of the following is the other word for "burning"?

1. combustion
2. conduction

Burning

a substance (fuel) + oxygen = burning

Which of the following is NOT an example of fuel?

1. water
2. wood
3. natural gas
4. oil

Is there any energy changes?

Energy Changes in burning

Burning requires 3 things.
Type these three.

Types of Chemical Reactions

• exothermic 
• endothermic

Types of Chemical Reactions

• exothermic = exit of heat
• endothermic = heat enters

a chemical reaction in which thermal energy or heat is given out or exits from the burning substance.

What happens to the heat or thermal energy go when given out?

1. It dissipates/ scatters in the surroundings.
2. It disappears completely.

Other exothermic reactions

• burning of magnesium (magnesium + oxygen)
• reaction between potassium and water
• reaction between magnesium and hydrochloric acid