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WorksheetsYear 7 Particles revision
Total questions: 20
Worksheet time: 10mins
A mixture is:
just one substance, like pure salt
two or more things mixed together, like nuts and raisins.
two things joined together, like flour and sugar in a baked cake.
a lot of the same thing put together.
Salt seems to disappear if you stir it into water. Which statement is true?
The salt dissolves because it is insoluble.
The salt dissolves because it is soluble.
The salt melts because it is soluble.
The salt melts because it is insoluble.
When you add salt to water:
the salt is the solvent.
the water is the solute
the salt is the solute
the water is the solution
Which of these materials will have similar properties?
air, oxygen, ice
water, iron, air
iron, stone, wood
oil, water, wood
A solid, like rock, has a:
shape which is easy to change but its volume is fixed.
shape which is fixed but it can change its volume.
shape and a volume which are both easy to change.
shape and volume which are both fixed.
All liquids:
have a fixed volume and take the shape of their container.
have a fixed volume and a fixed shape.
will spread out until their volume has doubled.
can change their volume but not their shape
Gases:
A spread out until they fill the space around them.
B do not spread out.
C cannot be poured.
D keep their shape.
A theory is:
an idea that explains evidence.
the result of an experiment.
a chapter in a science book.
the instructions for doing an experiment.
Everything is made up of:
particles which are arranged differently in solids, liquids and gases.
particles which are arranged in the same way in solids, liquids and gases.
water particles.
nothing.
In a solid:
the particles are very close together.
the particles are as far apart as possible.
the particles are quite close together.
there are no particles.
In a gas:
the particles are held tightly in place by bonds.
there are no particles.
the particles are free to move anywhere.
the strong bonds let the particles move past each other
If you put a drop of coloured liquid into a glass of cold water and leave it to stand without stirring, what will happen to the colour?
It will float on the surface
It will spread out in the water within a second or two.
It will sink to the bottom and never spread out.
It will spread out in the water very slowly.
A smell can spread across a room even if there are no air currents. This is called:
convection.
diffusion
contraction.
distraction.
How fast do things spread out in liquids compared to gases?
They spread out faster in liquids.
They spread out faster in gases.
They spread out at exactly the same speed.
They do not spread out in liquids at all.
If you put some sugar into cold water and leave it without stirring, the sugar will eventually dissolve and mix with the water. This happens because:
particles are extremely small.
sugar particles are bigger than water particles.
water particles are bigger than sugar particles.
particles in a liquid are always moving around.
How do scientists test theories?
They see if their friends agree with them.
Theories are always correct, so scientists do not need to test them.
They use the theory to make predictions, and do experiments to see if the predictions are correct.
They look in a different book.
Filtering cannot be used to separate:
sand from a mixture of sand and water.
sugar from sugar solution.
tea leaves from a pot of tea.
leaves from a mixture of leaves and pond water.
A solid dissolved in water can be obtained by:
evaporating the liquid.
using a sieve.
using a filter.
freezing the liquid.
Pure water is:
water which is clean enough to drink.
water which runs off the hills.
rain.
water with nothing dissolved in it.
In a liquid:
the particles are very close together
the particles are as far apart as possible.
the particles are quite close together.
there are no particles.
