Saturday School Unit 5 and 6 8th Grade

Saturday School Unit 5 and 6 8th Grade

Unit 5 Review

Heat transfer

Multiple Choice

The best place to put a heater is at floor level. This heat transfer would be -

• conduction

• convection

• radiation

Multiple Choice

Packing cans of soda in a cooler full of ice will cause them to become very cold. This

heat transfer would be -

• conduction

• convection

• radiation

Multiple Choice

You have been hiking and come back to the camp with really cold hands. You put your

hands over the wonderful fire your father has made. This heat transfer would be -

• conduction

• convection

• radiation

Multiple Choice

A metal spoon is placed in a hot drink and the handle becomes warm. This heat

transfer would be -

• conduction

• convection

• radiation

Multiple Choice

Water at the bottom of the pot takes in heat from the stove burner and moves upwards taking the heat with it. What kind of heat transfer is this?

• conduction

• radiation

• convection

Multiple Choice

What heat transfer method gives plants the energy they need for photosynthesis to take place?

• conduction

• convection

• radiation

• glucose

Multiple Choice

Dean is making a trivet. A trivet is placed on a table beneath a hot pot.

He knows that he must choose something that will NOT allow heat to pass easily from the hot pot to the table. Which material should Dean use to make the trivet?

• Wood

• Aluminum

• Copper

• Silicon

Multiple Choice

Which object is a conductor of heat?

• An aluminum nail

• A rubber band

• A tree

• A balloon

Multiple Choice

Conductors allow heat to pass through easily. Insulators prevent the flow of heat. Which of the following items is a poor conductor and a good insulator?

• Silver

• Wood

• Stone

• Copper

Direction of heat flow

https://www.youtube.com/watch?v=QeotHi-APtY

Multiple Choice

How does heat move?

• from a warmer to a cooler object

• from a cooler to a warmer object

• toward a hot object

• away from a cold object

Multiple Choice

An aluminum plate and a plastic plate have been in the freezer all night long.  When you remove them the next morning, 

• the plates have the same temperature.
• the plastic plate has a higher temperature.
• the plastic plate has a lower temperature.
• the aluminum plate has a lower temperature.

Multiple Choice

What happens when ice cubes melt in a glass?

• Heat travels from the ice to the warmer water.
• No energy is transferred.
• Heat is transferred from the warmer water to the ice cubes.
• The water warms up due to the humidity

Unit 6

Phases of Matter/Temperature Scales

Melting vs Dissolving

https://www.youtube.com/watch?v=7DfD8glMuUw

Multiple Choice

What is a solvent?

• The substance that does the dissolving in a solution.

• The substance that is being dissolved in a solution.

• The mixing of different substances.

• The process in which neutral molecules lose or gain electrons

Multiple Choice

What is a substance that is dissolved in another substance? 

• solution
• solute
• solvent
• compound

Multiple Choice

Sugar in iced tea melts

• true

• false

Multiple Choice

Dissolving requires heat.

• true

• false

Multiple Choice

Dissolving is an interaction between:

• the conservation of matter and time

• two (or more) substances: a solute and solvent

• solids and liquids

• temperature of a solid and the air

Multiple Choice

What causes objects to melt?

• cold

• heat

• sound

• stirring

Multiple Choice

What is melting?

• a change from liquid to solid

• a change of smell

• a change from solid to liquid

• a change of amount of solute

Phase Change

https://www.youtube.com/watch?v=CMUmQRgJAo0

Multiple Choice

Is energy being added or removed in the following phase change diagram?

• energy is being added

• energy is being removed

Multiple Choice

Analyze the phase change diagram shown. Is energy being added or removed for this phase change diagram?

• Energy is being added

• Energy is being removed

Multiple Choice

Letter "C" represents which state of matter on the phase change diagram shown.

• Solid

• Liquid

• Gas

Multiple Choice

Which phase change is being represented in the particle diagram?

• melting

• evaporation

• condensation

• freezing

Multiple Choice

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms

• become smaller and take up less space.

• slow down and move closer together.

• merge together to form fewer atoms.

• speed up and move farther apart.

Multiple Choice

When heat is added to a liquid, what occurs?

• Liquid molecules begin to condense to form a solid.

• Liquid molecules are being slowed down to become a gas.

• Liquid molecules speed up and begin to spread out to become a gas.

• Liquid molecules begin to slow down to become a solid.

Multiple Choice

When heat is added to a liquid, what occurs?

• Liquid molecules begin to condense to form a solid.

• Liquid molecules are being slowed down to become a gas.

• Liquid molecules speed up and begin to spread out to become a gas.

• Liquid molecules begin to slow down to become a solid.