Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is matter that has a uniform and definite composition. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

Front

Define an element.

Back

An element is matter consisting of one kind of atom and cannot be broken down into simpler substances.

Front

What is a compound?

Back

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

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has visibly different substances or phases.

Front

What is the chemical formula for nitrogen gas?

Back

Front

How many protons does an aluminum atom have?

Back

An aluminum atom has 13 protons.

Front

How many neutrons does an aluminum atom have?

Back

An aluminum atom has 14 neutrons.

Front

What is the chemical formula for water?

Back

Front

What is a diatomic molecule?

Back

A diatomic molecule is a molecule that consists of two atoms, which can be of the same or different elements.