L9 - Physical and chemical changes

• Chemistry
• Secondary Education

Lesson 1 - What is IGCSE Chemistry?

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9

Lesson 9 - Physical and chemical changes

• use the KPT to explain how water changes its state.  

I will be successful if I can...

• compare and contrast physical and chemical changes.

• describe the physical changes (state changes) of water.

A

B

C

• Let's answer together!

Daily Review

• Open your Workbook on pages 14-15.

• Look for Challenge Questions 15c and 15d.

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Answers

hydrogen > methane > oxygen > chlorine

G must have a molecular mass greater than that of methane, but less than that of oxygen / it must have an Mr between 16 and 32.

phet.colorado.edu

• You only have 2 minutes to complete your task.

Check for understanding

• Open your Workbook on page 4.

• Look for Practice Question 4.

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3

Answers

freezing

melting

condensing

evaporation/ boiling

phet.colorado.edu

Answers

freezing

melting

condensing

evaporation/ boiling

Kinetic Particle Theory

Kinetic energy

Motion 

Arrangement

Forces

Separation

06:46

What change is shown in the picture?

1. physical change
2. chemical change

07:14

What change is shown in the picture?

1. physical change
2. chemical change

07:38

What change is shown in the picture?

1. physical change
2. chemical change

08:11

What change is shown in the picture?

1. physical change
2. chemical change

08:33

What change is shown in the picture?

1. physical change
2. chemical change

09:00

What change is shown in the picture?

1. physical change
2. chemical change

09:26

What change is shown in the picture?

1. physical change
2. chemical change

09:52

What change is shown in the picture?

1. physical change
2. chemical change

• TASK: Make a line graph of the given data.

Guided Practice (teamwork)

• Get our materials for the task.

• Listen for further instructions from my teacher.

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Experimental data

Time/s	5	10	15	20	25	30	35	40
Temperature/ o C	4	15	15	25	25	30	30	33

Experimental data

Time/s (x)	5	10	15	20	25	30	35	40
Temperature/ o C (y)	4	15	15	25	25	30	30	33

• You only have 7 minutes to complete your task.

Check for understanding

• Open your Workbook on pages 8-9.

• Look for Challenge Questions 11a to 11e.

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3

Answers

Solid

Solid and Liquid (melting is taking place)

Liquid

Liquid and Gas (boiling is taking place)

17 oC

115 oC

The temperature remains constant until the change of state is complete.

The melting point and boiling point are not those of water.

• You have 15 minutes to complete this task.

Classwork 6: States of matter

• Prepare your black or blue pen.

• Answer the given questions.

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• Open your notebook.
• Look for this.
• Read.
• Reflect.
• Complete.

Chemistry

 Journal

Name something you did not know before this lesson, 

but NOW you do!