1st, 2nd, 3rd Weeks Review Checkpoint

Front

What is radiation?

Back

Radiation is the transfer of energy through space without the need for a medium, such as heat from the sun reaching the Earth.

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases) caused by differences in temperature and density.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials, where heat moves from the hotter object to the cooler one.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

How many molecules of caffeine are in a single caffeine molecule?

Back

A single caffeine molecule consists of 5 atoms: 8 hydrogen (H), 10 carbon (C), 4 nitrogen (N), and 2 oxygen (O).

Front

What is an atom?

Back

An atom is the basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.