Chemistry 1st Semester Exam

Front

What is the mass number of an element?

Back

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

Front

What state of matter has a definite volume and takes the shape of its container?

Back

Liquid.

Front

Which category includes the majority of the elements?

Back

Metals.

Front

What does the sum of protons and neutrons in an atom equal?

Back

Mass number.

Front

What is a substance that can be separated into two or more substances only by a chemical change?

Back

Compound.

Front

Define an element.

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

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 the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded, while a mixture is a physical combination of substances.

Front

What is the definition of a solution?

Back

A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).