sign in sign up
<<
Home , Thermal decomposition

Title: Thermal Keywords: Carbonate

1. Name three biofuels. Methanol, ethanol and propanol

2. What are the products of incomplete combustion? + + carbon

3. What is an exothermic reaction? Gives out heat

4. Name 3 different fuels that can be used at home? Coal, oil, wood and gas

Enter the room in silence. Put your planner, pencil case, exercise book and any other equipment you will need on your desk. Place your bags in the cupboards. Recognise and explain thermal decomposition reactions.

Prior knowledge: Describe some uses of thermal decomposition.

Carbonate • What do the words thermal and decomposition mean?

• What do you think a thermal decomposition reaction is?

Compounds can be broken down into simpler substances by heating them. This is called thermal decomposition. No new substances are added. Many metal carbonates are decomposed on heating:

Metal carbonate → metal + Name the reactants or products for each equation.

1. → ______oxide + carbon dioxide

2. Magnesium carbonate → ______+ ______

3. ______→ zinc oxide + carbon dioxide

1.Which elements does 1) Calcium, , carbon calcium carbonate contain? 2) Safety goggles, clamp tightly but 2.What safety precautions don’t break the glass and do not should be taken during this touch hot glass. experiment? 3) Green powder turning black, and 3.Describe the changes that colourless limewater turning cloudy. you would expect to see during this experiment. Draw a diagram to describe your experiment.

Explain the two observations that you made. Uses of thermal decomposition reactions When heated, calcium carbonate forms lime, .

Lime is used to make and glass. It is also added to soils to reduce acidity. Consolidate

True or false 1. A test for oxygen is when limewater turns cloudy. False 2. Calcium oxide is used for cement and glass. True 3. Calcium oxide is a green powder. False 4. New substances are added during decomposition. False 5. Carbon dioxide is produced during decomposition . True