Year 7 Particles revision

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.