MSCGrid5PreAssessment

Front

What is water classified as?

Back

Water is classified as a compound because it is made up of two hydrogen atoms and one oxygen atom (H2O).

Front

Define a compound.

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements that are chemically combined.

Front

Give an example of a mixture.

Back

Air is an example of a mixture, as it contains various gases like nitrogen, oxygen, and carbon dioxide that are not chemically bonded.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a compound.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What is the significance of the subscript in a chemical formula?

Back

The subscript indicates the number of atoms of each element in a molecule; for example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the process of forming a compound called?

Back

The process of forming a compound is called chemical synthesis.

Front

What is the difference between a homogeneous and heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout (like saltwater), while a heterogeneous mixture has a non-uniform composition (like a salad).

Front

What is an example of a chemical reaction that forms a compound?

Back

The reaction of hydrogen gas with oxygen gas to form water (2H2 + O2 -> 2H2O) is an example of a chemical reaction that forms a compound.