1st Six Weeks Review Checkpoint

Front

What is a chemical reaction?

Back

A process where substances (reactants) change into different substances (products) through the breaking and forming of chemical bonds.

Front

What distinguishes an element from a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

How many atoms are in a molecule of carbon dioxide (CO2)?

Back

There are three atoms in a molecule of carbon dioxide: one carbon atom and two oxygen atoms.

Front

What is the symbol for Iron?

Back

Fe

Front

What is the definition of an element?

Back

A substance that cannot be broken down into simpler substances by chemical means.

Front

What is the definition of a compound?

Back

A substance formed when two or more elements are chemically bonded together.

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 composition, while a chemical change results in the formation of new substances.

Front

What is the atomic number of an element?

Back

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

Front

What is the formula for water?

Back

H2O

Front

What is the definition of a molecule?

Back

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