Counting Atoms

Front

What is an atom?

Back

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

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in a molecule.

Front

What does a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance.

Front

How do you count the total number of atoms in a chemical formula?

Back

Add the number of atoms of each element, considering subscripts and coefficients.

Front

In the formula H₂O, how many hydrogen atoms are there?

Back

There are 2 hydrogen atoms.

Front

In the formula C₆H₁₂O₆, how many total atoms are there?

Back

There are 24 total atoms (6 Carbon, 12 Hydrogen, 6 Oxygen).

Front

What is the difference between an element and a compound?

Back

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

Front

How many atoms of Calcium are in the formula CaCl₂?

Back

There is 1 atom of Calcium.

Front

How many atoms of Iron are in the formula 4Fe₂O₃?

Back

There are 8 atoms of Iron.