Balancing Chemical Equations

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Author:
carrieross
ID:
117321
Filename:
Balancing Chemical Equations
Updated:
2011-11-16 23:48:54
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chemical equations balancing
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Description:
Study Guide for grade 9 honors science balancing equations test
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  1. What side do the reactants go in a chemical equation?
    Left
  2. What side do the products go in a chemical equation?
    Right
  3. Is the equation below balanced? Explain

    K + H2O ---> H2 + KOH
    The number of H atoms on the LHS does NOT equal the number of H atoms on the RHS
  4. What is the first step to balance the following equation?

    K + H2O ---> H2 + KOH
    • 1. Change the coefficients of H2O and KOH in order to balance the number of H atoms
    • K + 2H2O ---> H2 = 2KOH
  5. 2K + 2H2O ---> H2 = 2KOH
    How do you know if the above eqution is balanced?
    The number of atoms on the left equals the number of atoms on the right.
  6. What is the second step to balance the following equation?K + H2O ---> H2 + KOH
    • 2. Change the coefficients of K in order to balance the number of K atoms
    • 2K + 2H2O ---> H2 = 2KOH
  7. Magnesium burns in the presence of oxygen to form magnesium oxide, MgO. Write a balanced equation for this reaction.
    2Mg + O2 ---> 2MgO
  8. Hydrogen Peroxide, H2O2, decomposes to form water and oxygen. Write a balanced equation for this reaction.
    H2O2 decmposes> H2O + O2
  9. Describes a reaction that releases energy to its surroundings.
    exothermic
  10. A state in which the forward and reverse paths of a change take place at the same rate
    equilibrium
  11. A substance that effects the reaction rate without being used up in the reaction
    catalyst
  12. A reaction in which a compound breaks down into two or more simpler substances
    decomposition
  13. A reaction in which two or more substances react to form a single substance
    synthesis
  14. The mass of one mole of a substance
    molar mass
  15. A number that appears before a formula in a chemical equation
    coefficient
  16. A reaction in which a substance reacts rapidly with oxygen, often producing heat and light
    combustion
  17. The substances formed as the result of a chemical change
    products
  18. The chemicals that are in the chemical reaction
    reactants
  19. What is the process or reaction in which the system absorbs energy from the surroundings in the form of heat?
    endothermic
  20. A catalyst that speeds up the reaction
    a positive catalyst
  21. Substances that slow a catalyst's effect in a chemical reaction
    inhibitors (or negative catalysts)

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