Revision card on chemical reaction
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| What are the features of chemical reaction? | it produce a new substance like gas or enery can change
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| What are the features of physical reaction ? | it doesnt produce any new product.
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| During the reaction, what might happene to chemicals? | They may split up or decompose
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| What forms when iron reactes with oxygen and water in the air? | it will produce iron oxide
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| iron+sulphric acid---->? | Iron sulphlate+hydrogen gas
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| What happens to a limestone when the gas in the air, such as carbon dioxied dissolves to make a weak acid?? | The limestone will corrode
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| What test do we use to test hydrogen?? | Squeeky pop test
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| What test do we use to test carbon dioxide?? | Limewater test
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| When you cook, what from cooker cause chemical energy? | Heat
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| magnesium+oxygen--->?? | Magnesium oxide
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| For a fire to burn, wgat are the three things that are needed? | Fuel, Oxygen, Heat
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| Why shouldn't we add water to buring oil? | because, when water sinks through the oil, and because of the heat, it will turn into steam which spreads the oil and make the fire bigger
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| What does carbon dioxide do, when an electronic is on fire? | it cut6s off the oxygen supply
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| What does candle wax contain?? | It contains a lot of carbon joint with hydrogen
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| fuel+oxygen-->?? | carbon dioxide+water
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| methane+oxygen-->? | Cardon dioxide+water
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| methane+oxygen(ona blue flame)-->?? | carbon monoxide+water
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| How does a candle produce energy to make a fire? | to start off, it needs heat energy and carbon and hydrogen will release energy to break apart
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| What type of fire should you use with water to let the fire out? | wood, fire, cloth
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| Describe the third type of reaction | It needs energy to start off, but it wil keep greacting on it's own
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| Describe the test used for pure oxygen | you put a glowing splint inside, then it will light again
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| What chemical does Starch contain? | it contains, carbon, hydrogen and oxygen
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| how does a chemical reaction occur? | it occures when chemical join or break apart
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| When a new substance is formed, is it irreversible? | yes
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| What are the reactants? | they are chemicals that are used to react with each other
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| When does chemical reaction becomes an explosion? | when:
A large amount of gas is formed, A lot of heat is released, plenty of owygen is available.
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| What is nitroglycerine? | It is a explosive chemical which is not stable
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