Chemical Reactions

Burning something is an example of a...

• Chemical Reaction

• Physical Reaction

Reactants are one the _______ hand side of the reaction equation

• Left

• Right

• Middle

• Top

For a chemical reaction to happen

• names must change

• the state of the chemicals must change

• chemical bonds must break and re form

• magic occures

If I start with 2 Sodium atoms, how many must I end with?

• 1

• 2

• 3

• doesn't matter

Calcium Carbonate and Hydrochloric Acid make

• Water and Calcium Hidride

• Calcium Carbide and Hydrogen

• Calcium Chloride, Carbon Dioxide and Water

• Hydrogen

Decompose means

• break down

• make new things

• rot

• make a new song

Combustion needs...

• fuel, carbon dioxide and heat

• heat and oxygen

• heat, oxygen and hydrogen

• fuel, heat and oxygen

Combustion is...

• Exothermic

• Endothermic

Thermally decomposing Calcium Carbonate makes...

• Calcium and Carbon

• Calcium Oxide and Carbon Dioxide

• Oxygen and Calcium Carbide

• Water and Oxygen

What are the signs that there has been a reaction?

• bubbles made

• change in mass

• change in colour

• precipitate