How can we tell a chemical reaction has taken place?

In this lesson, we will learn about the difference between physical changes and chemical reactions. We will learn about the particles in both of these types of change and the signs to look out for in a chemical reaction. You will need a pencil, a ruler and a piece of paper for this lesson. If you have baking soda and vinegar then you will need that for an investigation too, but don't worry you can still take part without these things.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Is sand soluble or insoluble?

Soluble Insoluble

1/5

Q2.Is salt soluble or insoluble?

Soluble Insoluble

2/5

Q3.When should you use filtration?

to separate an insoluble solid from a liquid when the solid particles are large to separate an insoluble solid from a liquid when the solid particles are very small to separate a soluble solid from a liquid

3/5

Q4.When should you use evaporation?

4/5

Q5.When should you use sieving?

5/5

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Is sand soluble or insoluble?

Soluble Insoluble

1/5

Q2.Is salt soluble or insoluble?

Soluble Insoluble

2/5

Q3.When should you use filtration?

3/5

Q4.When should you use evaporation?

4/5

Q5.When should you use sieving?

5/5

Video

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Science - Chemical reactions - End of Lesson Quiz

Don't worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Which indicator of a chemical change is represented by picture A?

Formation of precipitate Temperature change Odour Colour change Formation of gas

1/5

Q2.Which indicator of a chemical change is represented by picture B?

Colour change Temperature change Odour Formation of precipitate Formation of gas

2/5

Q3.Which indicator of a chemical change is represented by picture C?

Colour change Temperature change Formation of gas Formation of precipitate Odour

3/5

Q4.Which indicator of a chemical change is represented by picture D?

Formation of gas Temperature change Odour Formation of precipitate Colour change

4/5

Q5.Which indicator of a chemical change is represented by picture E?

Colour change Formation of gas Odour Formation of precipitate Temperature chnage

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Science - Chemical reactions - End of Lesson Quiz

Don't worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Which indicator of a chemical change is represented by picture A?

Formation of precipitate Temperature change Odour Colour change Formation of gas

1/5

Q2.Which indicator of a chemical change is represented by picture B?

Colour change Temperature change Odour Formation of precipitate Formation of gas

2/5

Q3.Which indicator of a chemical change is represented by picture C?

Colour change Temperature change Formation of gas Formation of precipitate Odour

3/5

Q4.Which indicator of a chemical change is represented by picture D?

Formation of gas Temperature change Odour Formation of precipitate Colour change

4/5

Q5.Which indicator of a chemical change is represented by picture E?

Colour change Formation of gas Odour Formation of precipitate Temperature chnage

5/5

Lesson summary: How can we tell a chemical reaction has taken place?

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The next lesson in Particles in physical and chemical changes is "What happens to particles during burning?"

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