2.4 - Chemical Reactions - 1

2.4 - Chemical Reactions

Page 49 - 50

Poll

Which of the following best describes how you are feeling right now

Lesson Objectives

At the end of the lesson, students will be able to

- DESCRIBE what happens during a chemical reaction

- IDENTIFY four possible clues that a chemical change has taken place

Open Ended

Have a look at the match stick in page 48 of your book, what major difference can you identify between the burnt part of the stick and the un-burnt part of the match stick?

A CHEMICAL PROPERTY IS AN ABILITY TO UNDERGO CHEMICAL CHANGE

Chemical Changes

• Left side is rusted iron - Fe₂O₃

• Right side is regular iron - Fe

Multiple Choice

Which of the following is not used to describe a chemical change

• Burn

• Explode

• Break

• Corrode

Multiple Choice

Which of the following is a chemical property?

• color

• hardness

• freezing point

• ability to react with oxygen

Chemical Changes

• Left side is rusted iron - Fe₂O₃

• Right side is regular iron - Fe

Multiple Choice

Which of the following is a chemical property of water at 4°C?

• its color

• its state

• its temperature

• its ability to decompose into hydrogen and oxygen

Open Ended

What happens during a chemical change

The end of Period 1