Mid-year Check-In Grade 8 Science

All three states of matter are present when a candle is burning. Identify the three states of matter in this situation.

Answer explanation

Solid: the candle wax

Liquid: the melted wax droplets

Gas: the smoke

Identify an example for each state of matter and which state it is an example of.

Answer explanation

You will need to provide ONE example for each state of matter. Here are some examples.

Examples of solids: bricks, ice, wood, paper

Examples of liquids: milk, water, honey

Examples of gases: helium, carbon dioxide, propane

Identify one property for each state of matter and which state it is for.

Answer explanation

You will have to provide ONE property: here are some examples:

Solids: have a definite shape and volume; particles are close together, particles vibrate slowly

Liquids: volume stays the same but they take the shape of the container; particles have gaps between them and can move past each other

Gas: both volume and shape can change; particles are very far apart and move freely and quickly

Before rain falls as a liquid, water particles in the air (as a gas) form into rain droplets (liquids). How do the particles start and end?

• From Y to Z

• From X to Y

• From Z to X

• From Y to X

• From X to Z

Which phase change took place?

• Evaporating

• Freezing

• Melting

• Condensing

Identify the two objects that were made of the same substance. Explain your reasoning and include data from the table to support your answer. (AT LEAST TWO COMPLETE SENTENCES)

Answer explanation

Melting point will always stay the same since it is a property.

Soluble in water will always stay the same since it is a property.

Mass is not a property, you can measure any amount of any substance.

Which diagram shows the car continuously slowing down?

• A

• B

• C

• D

Which describes the electric force between the charges?

• Set A has a larger force, which is attractive

• Set A has a larger force, which is repulsive

• Set B has a larger force, which is attractive

• Set B has a larger force, which is repulsive

Which diagram represents the electric field lines around the two objects?

• top left

• top right

• bottom left

• bottom right

A student placed a compass above a wire in a circuit. Here is the diagram of what happened.

Which of the following claims is supported by the evidence in the diagram?

• An electric current produces a magnetic field.

• A magnetic field produces an electric current.

• An electric current flows from a negative to a positive terminal.

• A magnetic field extends from a north pole of a magnet to its south pole.