What is a chemical reaction and how can we identify them?

In this lesson, we will find out what happens during a chemical change, look at some examples of chemical changes and practise representing chemical changes using word equations.

What is a chemical reaction and how can we identify them?

In this lesson, we will find out what happens during a chemical change, look at some examples of chemical changes and practise representing chemical changes using word equations.

Lesson details

Key learning points

  1. Know what a chemical reaction is
  2. Describe signs that a chemical reaction has taken place
  3. Give examples of chemical reactions

Licence

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5 Questions

Q1.
Liquids can flow because ...
The particles are not arranged in a regular pattern.
The particles can move freely in all directions.
Correct answer: The particles can slide past each other.
The particles have lots of energy.
Q2.
When water becomes ice the process is called ...
Boiling
Condensing
Correct answer: Freezing
Melting
Q3.
Burning paper is an example of a physical change.
Correct answer: False
True
Q4.
Sugar dissolving in water is an example of a physical change.
False
Correct answer: True
Q5.
A ceramic bowl smashing is not an example of a physical change.
Correct answer: False
True

5 Questions

Q1.
A chemical reaction involves a change in the arrangement of particles.
Correct answer: False
True
Q2.
A match burning is an example of a chemical reaction.
False
Correct answer: True
Q3.
Salt dissolving is an example of a chemical reaction.
Correct answer: False
True
Q4.
What is a reactant?
The energy gained by particles when a substance is heated.
Correct answer: The substances at the start of a chemical reaction.
The substances that form in a chemical reaction.
The substances that stay the same in a chemical reaction.
Q5.
What is a product?
The energy gained by particles when a substance is heated.
The substances at the start of a chemical reaction.
Correct answer: The substances that form in a chemical reaction.
The substances that stay the same in a chemical reaction.

Lesson appears in

UnitScience / Physical and chemical changes

Science