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UNIT 1 MATTER AND ENERGY
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What is density?
The amount of matter that occupies an space.
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The change from liquid to solid state is...
Freezing
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What is the smallest unit of matter?
The atom
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Which units do you use to measure the volume?
Litres or mililitres
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The change from solid to liquid state is...
Melting
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Which process do you use to separate a solution made up by water and salt?
Filtration / evaporation
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Name the two types of mixtures
Homogeneous and heterogeneous
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In combustion, the combination of oxygen and fuel produces...
Energy and waste products
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Which process do you use to separate two liquids with different boiling points (such as alcohol and water)?
Distillation
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What do you need to burn something?
Oxygen, fuel and energy.
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Is carbon dioxide (CO2) a compound or a mixture?
A compound (it is made by 2 atoms of oxygen and 1 atom of carbon)
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What is matter?
Matter is anything that has mass and occupies space.
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Which process do you use to separate two liquids with different densities (such as water and oil)?
Decantation
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What is a heterogeneous mixture?
A mixture in which the substances are not joined, so you can distinguish them.
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What is a compound?
Two elements that join together to make a molecule
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Which process do you use to separate iron and sand?
Magnetism
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True or false: Metals and food can suffer oxidation.
True
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What can you separate through magnetism?
Substances with magnetic and non-magnetic properties
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Chopping a carrot is reversible / irreversible change.
Irreversible
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Name the pure substances.
Elements and compounds
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Which units do you use to measure the mass?
kilograms or grams
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What is an homogeneous mixture?
A mixture in which we can't distinguish the different substances.
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What chemical reaction is produced when a substance reacts with oxygen?
Oxidation
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The change from gaseous to liquid state is...
Condensation
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What is a reversible change?
A change that is temporary and the original material can be recovered.
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Which chemical change involves microorganisms?
Fermentation
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What is volume?
The space that an object occupies.
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Open your school bag is reversible / irreversible change.
Reversible
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The change from liquid to gaseous state is...
Evaporation
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What is an irreversible change?
A change that is permanent and the original material can't be recovered.
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What is mass?
Mass is the amount of matter that an object contains
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