# Bell task: Finish the word equations in the back of your book Magnesium + oxygen Calcium + oxygen Copper oxide + carbon.

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Bell task: Finish the word equations in the back of your book Magnesium + oxygen Calcium + oxygen Copper oxide + carbon

Starter: What do you know? Quiz to test what you know on C1.1 and C1.2 Finished early? Start reading page

During a chemical reaction Old bonds break New bonds form Most compounds end in –ide if two elements bond, but if three and one of them is oxygen then they end in –ate.

In chemical reactions no atoms are lost or destroyed. The mass of the reactants is equal to the mass of the products This is called conservation of mass. How can you tell from the diagram that a chemical reaction took place between substance P and substance Q? Substance P is Carbon, Suggest what substance Q and R could be. How does the diagram show that mass has been conserved in the reaction?

What is a hydrocarbon? Atoms of hydrogen and carbon bonded together – COMPOUND Methane Ethane cc pentane

What are the products of the complete combustion of a hydrocarbon? Plenty of air is needed to provide enough oxygen for a hydrocarbon fuel to burn completely. oxygen carbon dioxide hydrocarbon ++  water The blue flame of a gas hob or a Bunsen burner is an example of complete combustion of a hydrocarbon (in this case, natural gas). Complete combustion of hydrocarbons

Complete combustion of propane Propane is a hydrocarbon used in camping gas. It has 3 carbon atoms and 8 hydrogen atoms What is the equation for its combustion? oxygen carbon dioxide propane + +  water c propane oxygen Carbon Dioxide Water

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water Step 1: Count the number of Carbons in the reactants Step 2: Make sure you have the same number in the reactants by changing the number of carbon dioxide

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water Step 3: Count the number of hydrogen on in the reactants, and make sure there is the same number in the products by changing the number of water

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water Step 4: Next look at the number of oxygen atoms on each side and make them equal.

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water Step 4: Next look at the number of oxygen atoms on each side and make them equal.

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water Step 5: Write as a Symbol equation

Complete combustion of propane – how would you balance the equation c propane oxygen Carbon Dioxide Water C 3 H 8 + 5O 2  3CO 2 +4H 2 0

Complete combustion of butane: Draw the atom diagram and write the symbol equation ethane Oxygen Carbon Dioxide Water C 1 H 4 +  O 2   CO 2 +  H 2 0 c

Complete combustion of butane: Draw the atom diagram and write the symbol equation BEWARE THERE MAY BE AN EXTRA STEP!!! c butane Oxygen Carbon Dioxide Water C 4 H 10 +  O 2   CO 2 +  H 2 0 c

Complete combustion of butane: Draw the atom diagram and write the symbol equation ethane Oxygen Carbon Dioxide Water C 1 H 4 +  O 2   CO 2 +  H 2 0 c

Complete combustion of butane: Draw the atom diagram and write the symbol equation BEWARE THERE MAY BE AN EXTRA STEP!!! Oxygen Carbon Dioxide Water C 4 H 10 + 13O 2  8CO 2 + 10 H 2 0 c butane ccc

Extension Explain conservation of mass and how it is demonstrated in chemical equations ( 5 marks)

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