Elements, Compounds, Atoms, and Molecules

Front

What is a compound?

Back

A compound is two different elements bonded together.

Front

What is an element?

Back

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

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.

Front

How many atoms are in a molecule of water (H2O)?

Back

There are 3 atoms in a molecule of water: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the chemical formula for glucose?

Back

The chemical formula for glucose is C6H12O6.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that are not chemically bonded, while a compound is formed when two or more elements are chemically bonded.

Front

How many total atoms are in the compound H2SO4?

Back

There are 7 total atoms in H2SO4: 2 hydrogen, 1 sulfur, and 4 oxygen.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element present in the molecule.

Front

What is the chemical formula for a compound with 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms?

Back

The chemical formula is C12H22O11.