Home > Science > Chemical and material behaviour > Compounds and mixtures
How many different atoms are there in a compound?
two or more
Does this show an element, a mixture or a compound?
Which statement about atoms and molecules is correct?
elements always exist as separate atoms.
elements always exist as pairs of atoms called molecules.
elements and compounds can exist as molecules.
Is water an element, compound or mixture?
Which is the best way to get salt from salty water?
Pure water can be separated from inky water by simple distillation. This is because:
water and ink have different boiling points.
water evaporates leaving the ink particles behind.
ink evaporates leaving the water behind.
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
Which method is usually used to separate coloured substances from each other?
Which of these three metals is the most reactive: potassium, iron or gold?
Which of these three metals is the least reactive: iron, copper or platinum?
Copper and oxygen react to form which compound?