8th Grade Physical Science Review

What is a chemical reaction?

• A chemical reaction is a mathematical equation.

• A chemical reaction is a physical change in matter.

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a biological process.

Explain the Law of Conservation of Energy.

• Energy can neither be created nor destroyed, only converted from one form to another.

• Energy can be destroyed but not created

• Energy can only exist in one form

• Energy can be created but not destroyed

Define force and provide an example.

• Force is only applicable in outer space.

• Force is a form of light.

• Force is a push or pull that can change the state of motion of an object. For example, when a person pushes a car to move it forward, they are applying a force to the car.

• Force is a type of energy that objects possess.

How do waves transfer energy?

• Through the vibration of particles in the medium

• Through the levitation of particles in the medium

• Through the stillness of particles in the medium

• Through the rotation of particles in the medium

Describe the structure of an atom.

• The structure of an atom consists of protons and electrons only

• Atoms have a single energy level where all particles are located

• The structure of an atom includes a nucleus composed of protons and neutrons, with electrons orbiting around the nucleus in specific energy levels.

• The nucleus of an atom is made up of electrons and protons

What are the properties of matter?

• Taste, smell, sound

• Length, temperature, speed

• Mass, volume, density, physical state

• Weight, shape, color

What happens during a chemical reaction?

• Only physical changes take place

• No changes occur in the atoms

• Atoms are created from scratch

• Chemical bonds are broken and new bonds are formed, leading to the rearrangement of atoms.

How is energy transferred in a closed system?

• Via telekinesis, photosynthesis, and fermentation.

• Through processes such as conduction, convection, and radiation.

• By telekinesis, telepathy, and teleportation.

• Through photosynthesis, respiration, and fermentation.

What is the relationship between force and motion?

• Newton's second law of motion describes the relationship between force and motion.

• Force and motion are unrelated concepts.

• Force always results in motion.

• Motion is not affected by force.

How do electromagnetic waves differ from mechanical waves?

• Electromagnetic waves have a higher frequency than mechanical waves.

• Electromagnetic waves do not require a medium to travel through, while mechanical waves do.

• Electromagnetic waves are longitudinal waves, while mechanical waves are transverse waves.

• Electromagnetic waves travel faster than mechanical waves.