Grade 9 Chemical Equations Worksheet

Chemical Equations: Grade 9 Science

Read each question carefully and provide your answers in the spaces provided. Show all your work for calculations.

1. In a chemical equation, the substances on the left side of the arrow are called  , and the substances on the right side are called  .

2. The Law of Conservation of Mass states that mass is neither created nor   during a chemical reaction.

3. A   equation represents a chemical reaction using chemical formulas and symbols.

1. Which of the following represents a balanced chemical equation?

2. What type of reaction is represented by: A + B → AB?

Balance the following chemical equations:

1.   N₂ +   H₂ →   NH₃

2.   CH₄ +   O₂ →   CO₂ +   H₂O

3.   Al +   O₂ →   Al₂O₃

Identify the type of chemical reaction for each of the following equations (synthesis, decomposition, single displacement, double displacement, or combustion):

1. 2KClO₃ → 2KCl + 3O₂

2. HCl + NaOH → NaCl + H₂O

3. Zn + CuSO₄ → ZnSO₄ + Cu

1. When solid sodium reacts with chlorine gas, sodium chloride is formed. Write the balanced chemical equation for this reaction.

2. Methane (CH₄) burns in the presence of oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). Write the balanced chemical equation for this combustion reaction.

Observe the image below, which depicts a chemical reaction. In your own words, describe what is happening in the image and what evidence suggests a chemical change has occurred.