Unit C Science 7

Which of the following are heat technologies?

• Furnace

• Ice pack

• Toaster

• All of the above

Answer explanation

All technology that absorbs, produces, or controls heat is a heat technology

A refrigerator is an example of a technology that...

• Absorbs cold

• Absorbs heat

• Produces cold

• Produces heat

Answer explanation

Nothing can produce cold! It can only absorb heat.

Which of the following is a needed technology?

• Furnace

• Hair straightener

• Lighter

• BBQ

Answer explanation

Needed technologies are things you COULD NOT survive without.

Without a furnace, we would need some other heat technology to keep us alive and maintain our houses.

Particles ____ _______ when heated

(a)  

Which part of the particle model explains that solids are always vibrating

• Particles are always moving

• All matter is made of particles

• Particles have space between them

• None of the above

Answer explanation

Particles are ALWAYS moving! Even really cold solids have a little movement in their particles.

Which definition of temperature is correct?

• Temperature is how hot or cold it feels

• Temperature is the average energy of particles in an area

• Temperature is a measure of the amount of heat a particle has

• Temperature means the same thing as heat

Answer explanation

Temperature is the average kinetic energy of particles in a given area: Such as a room.

When a liquid changes to a gas it is called

• Freezing

• Melting

• Evaporation

• Sublimation

Answer explanation

Liquid -> gas is evaporation

Suppose a substance undergoes 'deposition.'

What states of matter did it change between?

• Solid -> Liquid

• Gas -> Solid

• Solid -> Gas

• Liquid -> Gas

What would cause particles to pull closer together, reducing the volume of the object

• Reducing the temperature

• Increasing the temperature

• Quickly heating and cooling the object

• Blowing warm air on the object

Answer explanation

Particles huddle closer together in the cold, almost as if they are huddling for warmth!

Which form of heat transfer involves direct contact?

• Radiation

• Convection

• Conduction

• None of the above

Answer explanation

Conduction requires direct contact for heat to transfer.