Counting Atoms Practice

Front

What is an element?

Back

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

Front

What is a compound?

Back

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

Front

What is the chemical formula for salt?

Back

The chemical formula for salt is NaCl.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

How many elements are in the compound C3H8?

Back

There are 2 elements in the compound C3H8: carbon (C) and hydrogen (H).

Front

What is the chemical formula for oxygen gas?

Back

The chemical formula for oxygen gas is O2.

Front

How many hydrogen atoms are in glucose (C6H12O6)?

Back

There are 12 hydrogen atoms in glucose.

Front

What is the difference between an element and a compound?

Back

An element is made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the chemical formula for propane?

Back

The chemical formula for propane is C3H8.

Front

What does the term 'atom' mean?

Back

An atom is the smallest unit of an element that retains the properties of that element.