Chemical reactions

What is a chemical reaction?

• Magic!

• When chemicals change

• When atoms rearrange

• When you make a cup of tea

What does reactivity mean?

• Reactivity is how angry someone is

• Reactivity is a measure of how quickly a substance melts

• Reactivity is the tendency of something to take part in a chemical reaction

There are three ways to detect a chemical change. Choose the option with all three

• Change in colour, gas is made, change in temperature

• Change in colour, dissolving, change in temperature

• Gas is made, change of state, mixing

• Gas is made, change in temperature, dissolving

Which one is a sign of a physical change?

• change in colour

• gas is made

• change of state

• change in colour

Is ice melting a physical or a chemical change?

• Physical

• Chemical

Is burning a match a physical or a chemical change?

• Physical

• Chemical

Is diluting cordial a physical or a chemical change?

• Physical

• Chemical

Is baking a cake a physical or a chemical change?

• Physical

• Chemical

Is cooking some chicken a physical or a chemical change?

• Physical

• Chemical

Is boiling water a physical or a chemical change?

• Physical

• Chemical