Counting Atoms

Multiple Choice

Why is it important to count atoms when looking at reactants and products in a chemical equation?

• To ensure the equation is balanced and follows the law of conservation of mass

• To find the molecular weight of compounds

• To identify the type of chemical reaction

• To determine the color of the substances

Open Ended

Explain the significance of a chemical equation in understanding chemical changes.

Multiple Choice

Which side of a chemical equation are the reactants written on?

• Left side

• Right side

• Top side

• Bottom side

Open Ended

Explain the difference between a subscript and a coefficient in a chemical formula, and give an example of each.

Multiple Choice

Which of the following correctly represents three molecules of carbon dioxide?

• CO2

• 3CO2

• CO3

• O2CO

Multiple Choice

In the equation CH4 + 2O2 → CO2 + 2H2O, how many hydrogen atoms are present on each side of the equation?

• 2

• 4

• 6

• 8

Multiple Choice

Determine the number of carbon atoms on the product side of the equation: 2C2H6 + 7O2 → 4CO2 + 6H2O

• 2

• 4

• 6

• 8

Open Ended

Why is it important to count the number of atoms on both sides of a chemical equation?

Multiple Choice

Determine the number of Lithium (Li) atoms are in the following chemical formula: Li₂SO₄

• 1

• 2

• 4

Draw

Fill in the coefficient