8th grade Semester 1 Exam

Front

What is the boiling point of water?

Back

The boiling point of water is the temperature at which it changes from a liquid to a gas, typically at 100°C (212°F) at sea level.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of Neutrons = Mass Number - Atomic Number.

Front

What are metals?

Back

Metals are elements that are shiny, conduct electricity, can be hammered into shapes, and drawn into wires.

Front

What is the state of matter with the greatest attractive forces between particles?

Back

Solid.

Front

What is matter?

Back

Anything that takes up space and has mass.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a mass number?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that are not chemically bonded, while a compound is a substance formed when two or more elements are chemically bonded.

Front

What are the three states of matter?

Back

Solid, liquid, and gas.

Front

What is the definition of a liquid?

Back

A liquid is a state of matter that has a definite volume but no definite shape, taking the shape of its container.