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Elements, compounds and mixtures
Elements, compounds and mixtures
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Elements, compounds and mixtures, 2º ESO physics and chemistry
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11 cards
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Questions
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Answers
1
Does this show an element, a mixture or a compound?
compound
mixture
element
2
Pure water can be separated from inky water by simple distillation. This is because:
water evaporates leaving the ink particles behind.
ink evaporates leaving the water behind.
water and ink have different boiling points.
3
Which is the best way to get salt from salty water?
filtration
evaporation
distillation
4
How many different atoms are there in a compound?
always two
one
two or more
5
Which of these three metals is the most reactive: potassium, aluminium, iron or gold?
iron
aluminium
gold
potassium
6
Which statement about atoms and molecules is correct?
elements always exist as pairs of atoms called molecules.
elements always exist as separate atoms.
elements and compounds can exist as molecules.
7
Which of these three metals is the least reactive: iron, copper or platinum?
iron
copper
platinum
8
Which method is usually used to separate coloured substances from each other?
evaporation
simple distillation
chromatography
Centrifuge
9
Copper and oxygen react to form which compound?
copper oxygen
carbon dioxide
copper oxide
10
Is water an element, compound or mixture?
mixture
element
compound
11
What is the correct order for obtaining salt from a mixture of sand and salt?
dissolving in water - filtration - evaporation
evaporation - filtration - dissolving in water
filtration - dissolving in water - evaporation
