Combustion reactions always release energy. What word can be used to describe them?
exothermic reaction exothermic reactions release energy into their surroundings
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what type of energy is combustion?
it is mostly thermal energy but light and sound energy are also released
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what other type of reaction is there?
endothermic reactions- which take in energy from their surroundings
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When methane burns in oxygen, carbon dioxide and water are made. Which is a reactant?
Oxygen
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Copper oxide and carbon dioxide are made when copper carbonate is heated strongly. Which is a product?
opper oxide
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What name is given to the force that holds atoms together in a compound?
chemical bond
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What is a hydrocarbon?
A compound made from carbon and hydrogen only
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What is produced when a hydrocarbon fuel burns in a very good supply of oxygen?
Carbon dioxide and water are produced. Carbon monoxide is produced when there is not enough oxygen.
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Which type of combustion releases the most energy?
Complete combustion releases the maximum amount of energy.
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What name is given to a substance that speeds up a reaction without being used up or chemically changed?
Catalyst
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What are the three things in the fire triangle?
Oxygen, heat and fuel
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What happens in complete combustion?
the hydrogen atoms combine with oxygen to make water vapour, H2O the carbon atoms combine with oxygen to make carbon dioxide, CO2 the maximum amount of energy is released
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what happens to limewater when carbon dioxide is bubbled through it?
it turns milky (cloudy white)
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when does incomplete combustion happen?
when there is not enough air or oxygen for complete combustion
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what are the products oof incomplete combustion?
water vapour, carbon dioxide, carbon monoxide and particles of carbon that appear as sot and smoke
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what is an example of oxidation?
combustion is an example of a type of reaction called oxidation
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what happens in an oxidation reaction?
a substance gains oxygen.
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can metals and non metals take place in oxidation reactions?
yes
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what happens when a metal reacts with oxygen in the air?
it makes a metal oxide. For example, magnesium reacts with oxygen to produce magnesium oxide when it is heated in air: magnesium + oxygen → magnesium oxide 2Mg + O2 → 2MgO
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are metal oxides acidic or basic
metal oxides are bases
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what happens when a base reacts with an acid
it neutralises the acid
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Other cards in this set
Card 2
Front
Combustion reactions always release energy. What word can be used to describe them?
Back
exothermic reaction exothermic reactions release energy into their surroundings
Card 3
Front
what type of energy is combustion?
Back
Card 4
Front
what other type of reaction is there?
Back
Card 5
Front
When methane burns in oxygen, carbon dioxide and water are made. Which is a reactant?
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