LEARNING INTENTIONS AND SUCCESS CRITERIA
Learning Intention:We are learning how one substance changes into a different substance so that we can recognise when a chemical change has occurred.
Success Criteria:
Success Criteria:
- I can describe a physical change.
- I can describe a chemical change.
- I can compare physical and chemical change.
- I can describe 3 examples of chemical changes that occur in everyday life.
TEST YOURSELF.. Identify whether each example below is a physical or chemical change
PHYSICAL CHANGE
When you melt an ice cube (H2O), you have a physical change because you add energy. You added enough energy to create a phase change from solid to liquid. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice. The water molecules are still water molecules.
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CHEMICAL CHANGE
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
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EXAMPLE
PHYSICAL CHANGE
CHEMICAL CHANGE