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ChemistryGrade 9en

⚗️ Chemical Reactions and Balancing Equations

Master the fundamentals of chemical reactions, from identifying reactants and products to balancing equations using the law of conservation of mass. **What you'll learn:** - Identify reactants and products in chemical equations - Apply the law of conservation of mass to balance equations - Recognize common types of chemical reactions - Balance equations with coefficients - Calculate mole ratios from balanced equations

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  1. Question 1

    In the chemical equation 2H2+O2→2H2O2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}, which substances are the reactants?

  2. Question 2

    The law of conservation of mass states that matter can be created or destroyed during a chemical reaction.

  3. Question 3

    In a balanced chemical equation, the numbers written in front of chemical formulas are called ___.

  4. Question 4

    Which of the following represents a properly balanced equation?

  5. Question 5

    Changing the subscripts in a chemical formula is an acceptable way to balance an equation.

  6. Question 6

    What type of chemical reaction is represented by AB→A+B\text{AB} \rightarrow \text{A} + \text{B}?

  7. Question 7

    Balance this equation: Fe+O2→Fe2O3\text{Fe} + \text{O}_2 \rightarrow \text{Fe}_2\text{O}_3. The coefficient of Fe is ___ and the coefficient of O2\text{O}_2 is ___.

  8. Question 8

    In the balanced equation 2H2+O2→2H2O2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}, the mole ratio of H2\text{H}_2 to O2\text{O}_2 is 2:12:1.

  9. Question 9

    Which equation is correctly balanced for a combustion reaction?

  10. Question 10

    Arrange these steps in the correct order for balancing a chemical equation.