9.1) The diagram shows an experiment where zinc metal is added to sulfuric acid.

a: What is the name of the gas given off in this reaction?
b: How do you test for this gas?
c: What products are formed in this reaction?
d: How do you know when all of the acid has reacted?
e: Write the word equation for this reaction.

9.2) for each of the following, state if it is a physical change or a chemical reaction.
a: burning a piece of wood
b: melting chocolate
c: cooking an egg
d: heating glass and bending it
e: baking a cake.

9.3) Magnesium ribbon burns in air.

a: Write the chemical symbol for magnesium.
b: Name the element in the air that reacts with magnesium when it burns.
c: Name the compound formed when this element reacts with magnesium.
d: Magnesium also reacts with chlorine. Write the word equation that describes this reaction.

9.4) Rust is found on a garden fork that has been left outside.

a: Which of the following metals has the main part of the garden fork been made from?
aluminium        iron          copper        zinc
b: What is the chemical name for rust?
c: Suggest one way of preventing the fork from rusting.

9.5) Look at the following equations.
A- carbon + oxygen → carbon dioxide
B- sodium hydroxide + hydrochloric acid → sodium chloride + water
C- potassium + water → potassium hydroxide + hydrogen
D- copper carbonate → copper oxide + carbon dioxide
Write the letter for the equation that:
a: produces a metal oxide
b: is a neutralisation reaction
c: is a burning reaction.
Copy and complete the following equations:
d: sodium + water → ................. + hydrogen
e: copper carbonate + sulfuric acid → ................ + ................. + water
f: sulfur + ............ → sulfur dioxide