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17 Cards in this Set
- Front
- Back
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Explain the difference between MELTING and DISSOLVING.
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melting is when a substance changes form from a solid to a liquid (often due to a rise in temperature) whereas dissolving is when a solute is mixed with a solvent to create a solution.
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Is a gas fire burning a physical or a chemical change?Explain your answer.
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Chemical change- it cannot be reversed
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Is a copper roof turning green a chemical or physical change?Explain your answer.
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chemical- a new substance is formed
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What is thermal decomposition?
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The breaking down of a compound into 2 or more parts due to heat
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What is a physical change?
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A reaction in which there is a temporary change of state or form only
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What is a chemical change?
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A change in the chemical composition of a substance
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What is sublimation?
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A change from a solid to a gas with no liquid stage
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What is galvanising?
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To coat iron or steel in a layer of zinc- usually to protect rust
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Name 3 ways you can protect rust.
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Coat in paint or oil or galvanising
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What is rust?
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Iron oxide
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How does salt affect rusting?
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Salt speeds up the process of rusting
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What is corrosion?
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Corrosion is when a metal gets extracted and purified it gradually reacts with oxygen in the air to become an oxide again
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Which oxidised metals are known as rust?
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Only iron
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Name something that stops rusting.
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Silica gel
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Name 2 things that are needed for rusting.
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Water and oxygen
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What type of process is rusting?
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Rusting is an OXIDATION process
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How do you test a gas for oxygen?
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See if a glowing splint relights
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