Counting atoms

Front

What is the formula for calculating the number of atoms in a compound?

Back

To find the total number of atoms in a compound, sum the coefficients and the subscripts of each element in the formula.

Front

How many Sodium (Na) atoms are in 6NaCl?

Back

6

Front

How many Oxygen (O) atoms are in H₂O?

Back

1

Front

How many Aluminum (Al) atoms are in Al₂O₃?

Back

2

Front

How many Oxygen (O) atoms are in Al₂(SO₄)₃?

Back

12

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in one molecule of the compound.

Front

What is a coefficient in a chemical formula?

Back

A coefficient indicates the number of molecules or formula units of a substance.

Front

How many total atoms are in the compound C₂H₈O?

Back

11

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is followed, meaning the number of atoms of each element is the same on both sides of the equation.

Front

What is the difference between a molecule and a compound?

Back

A molecule is a group of atoms bonded together, while a compound is a type of molecule that contains at least two different elements.