Atoms, Molecules, Elements, Compounds

Front

What is an atom?

Back

An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

Front

What is a molecule?

Back

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

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture has the same composition throughout, meaning its components are evenly distributed.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture has a non-uniform composition, where different components can be easily distinguished.

Front

What is the chemical formula for methane?

Back

The chemical formula for methane is CH4.

Front

How many atoms are in a molecule of H2O?

Back

A molecule of H2O contains 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the symbol for oxygen?

Back

The symbol for oxygen is O.