Physical change and chemical change (6+7)p2

What is needed for rusting?

• water

• oxygen

• people

• heat

combustion is an............. ........

• neutral reaction
• endothermic reaction
• exothermic reaction
• oxidation process

An exothermic chemical reaction ........energy

• absorbs
• neutralizes
• transforms
• give out heat

The temperature of copper (II) sulfate solution increased from 20 Celcius to 24 Celcius when iron filings were added. The reaction is therefore.....

• acid and base

• endothermic reaction
• exothermic reaction
• neutral reaction

Which of the following is an example of an exothermic process?

• melting ice

• combustion of fuels

• dissolving salt in water

• photosynthesis