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.

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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.

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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.

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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)

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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.