7th Grade Semester Exam (M)

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas is a sign that a chemical reaction has occurred.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Melting butter for popcorn is a physical change.

Front

Which part of an atom is represented by the circles with a negative sign?

Back

Electrons are represented by the circles with a negative sign.

Front

How many elements are in C6H12O6?

Back

There are 3 different elements in C6H12O6: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

What is Newton's 1st law also known as?

Back

Newton's 1st law is also known as the law of inertia.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What are the three subatomic particles of an atom?

Back

The three subatomic particles are protons, neutrons, and electrons.

Front

What is the charge of protons?

Back

Protons have a positive charge.

Front

What is the charge of neutrons?

Back

Neutrons have no charge (they are neutral).