Elements, Compounds and Mixtures

Front

What are the basic building blocks of matter?

Back

Elements are the basic building blocks of matter, with slightly more than 100 different substances known.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties and is usually easy to separate.

Front

How many different models can be used to represent molecules?

Back

There are three different ways (models) that we can draw molecules.

Front

What is a molecule?

Back

A molecule is two or more atoms that are chemically combined.

Front

What happens when elements chemically combine?

Back

When elements chemically combine, they usually form compounds that have properties different from those of the uncombined elements.

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 a substance formed when two or more elements chemically combine.

Front

Can mixtures be separated easily?

Back

Yes, mixtures can usually be separated easily into their components because each component retains its own properties.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that consists of visibly different substances or phases.

Front

What is the law of definite proportions?

Back

The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.