Atoms and Molecules

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is a molecule?

Back

Any material made of two or more atoms.

Front

What are reactants in a chemical reaction?

Back

The beginning substances that undergo change.

Front

What are products in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

How many hydrogen atoms are in H2O?

Back

2

Front

How many carbon atoms are in one molecule of glucose (C6H12O6)?

Back

6

Front

What is a compound?

Back

A substance formed when two or more different elements combine chemically.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the chemical formula for methane?

Back

CH4 (1 carbon atom and 4 hydrogen atoms).

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.