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Key Stage 3 Science

QuestionAnswer
What is a catalyst A substance that speeds up a reaction, without itself being used up
What is corrosion of metals When metals reacts with oxygen and/or water in the air
What is the corrosion of iron known as? What are the conditions that enable this reaction to occur Rusting. Water and oxygen must be present for iron to rust
List two methods of rust prevention and explain how they work Painting, Grease or oil, they provide a barrier between the iron and oxygen and water. Galvanizing or sacrificial protection. A more reactive metal reacts with the air and water instead of the iron
Complete the general equation for the reaction of a metal with water Metal + water --> Metal + Water --> Metal Hydroxide + Hydrogen
Describe the test for hydrogen If lighted splint is put to the unknown gas produces a pop sound then the gas is Hydrogen
How could a group of metals be listed in order of reactivity by reacting the metals with water and acid React metals first with water Rank the metals that reacted with water in order of reactivity. These metals are the most reactive React the rest of the metals with acid Rank those metals in order of reactivity under the metals that reacted with water
Complete the general equation for the reaction of a metal with acid. Metal + acid --> Metal + Acid --> Salt + Hydrogen
Name the products of the reaction of A)Calcium and Hydrochloric acid B) Iron and Sulfuric Acid A) Calcium Chloride + Hydrogen B) Iron Sulfate + Hydrogen
Why is an alloy stronger than a pure metal The atoms of different sizes stop the layers of metal atoms sliding over each other
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