Week 7 Physical Science

Light energy is also known as _________ energy.

• radiant

• thermal

• kinetic

• chemical

Chemical energy in fossil fuels is most often released by what process?

• boiling

• mining

• burning

• refrigeration

Which energy transformation occurs when a lighter is lit?

• chemical energy to heat energy

• electrical energy to kinetic energy

• potential energy to electrical energy

• electrical energy to heat energy

Car engines operate using gasoline. Which of these is the main energy transformation as the fuel is used by the engine?

• Heat energy is converter to potential energy

• kinetic energy is converted to electrical energy

• chemical energy is converted to kinetic energy

• electrical energy is converted to kinetic energy

What source of energy is necessary to begin the process of photosynthesis?

• the wind

• the sun

• ocean currents

• green plants

Energy is the __________

• excitement you have about your work

• the ability to react to your environment

• the ability to change food into calories

• the ability to do work

In the process of photosynthesis, at what stage is oxygen produced?

• when oxygen and carbon dioxide combine

• when sun rays and water merge

• when carbon dioxide molecules and water combine

• when the earth explodes

What do scientists believe may be the best replaced for fossil fuels?

• solar energy

• natural gas

• petroleum

• coal

Why might scientists turn to plants for help with solar energy?

• plants use solar energy to manufacture food

• plants can show scientists how to use fossil fuels

• plants produce solar energy

• scientists think plants are smart

Why would hydrogen be considered an appropriate alternative to fossil fuels?

• plants naturally produce hydrogen

• hydrogen does not pollute the air and may be used as fuel in the future

• plants use hydrogen to make fuel

• hydrogen is a by-product of burning fossil fuels