7th Grade Science Post-Test

Kinetic energy is the energy of _________.

• potential
• motion
• gravity
• distance

As mass decreases, kinetic energy ___________

• decreases
• increases
• stays the same
• transforms

Energy that results from the position or shape of an object is _________.

• potential energy
• kinetic energy
• thermal energy
• mechanical energy

Which of the following describes the law of conservation of energy?

• Energy CANNOT be created or destroyed.
• Energy CAN be created by conservation.
• When energy is conserved, it ALWAYS changes forms.
• Energy INCREASES when it is transferred from one object to another.

This model demonstrates a chemical reaction between methane and oxygen gas. According to the Law of Conservation of Mass, matter is not created or destroyed. If we start with 4 hydrogen atoms, how many hydrogen atoms will we have at the end of the reaction?

• 1
• 2
• 3
• 4

Mr. Achee karate chopping a graham cracker in half is an example of what type of change?

• physical
• chemical
• thermal
• kinetic

Ms. Webber burning a marshmallow is an example of what type of change?

• chemical
• physical
• thermal
• kinetic

Something that has mass and takes up space is called ____________________.

• Protons
• Molecules
• Matter
• Electrons

A chemical change occurs when...

• the identity of a substance changes but its appearance does not.
• neither the appearance of a substance nor its identity changes.
• both the physical properties of a substance and its identity change.
• the appearance of a substance changes but its identity does not.

Which of the following is the symbol for an element?

• H2O
• NaCl
• Br
• NH3