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Balancing Chemical Equations - A Guide to Controlling Chemical Reactions

Learn how to determine if a chemical equation is balanced, explore physical and chemical changes, understand the factors that influence the rate of a chemical reaction, and more.

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Balancing Chemical Equations - A Guide to Controlling Chemical Reactions

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  1. Jeopardy Mr. Pytleski

  2. Balancing Chemical Equations Physical or Chemical Controlling Chemical Reactions Chemical Reactions 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500

  3. Row 1, Col 1 There is an equal # of atoms on both sides of the arrow How do you know a chemical equation is balanced?

  4. 1,2 Decomposition When a chemical equation breaks down a molecule into simpler parts, the reaction is known as ________.

  5. 1,3 Any change that does not change the substance Give me an example of a physical change in a substance.

  6. 1,4 Higher concentration, increase of surface area, increase temperature Name one way the RATE of a chemical reaction can sped up.

  7. 2,1 Sn + Cl2 = SnCl2 WHOLE CLASS Balance the equation below Sn + Cl2 ------- SnCl2

  8. 2,2 4 How many hydrogen and oxygen molecules are there on the ‘Product’ side of the following equation? 2 H2O2 2 H2O + O2

  9. 2,3 Physical Smashing or pulling apart a marshmallow is an example of what kind of reaction?

  10. 2,4 enzymes In our body there are proteins called ____ that help to speed up reactions within our cells to carry on life processes.

  11. 3,1 Law of Conservation of Mass In a chemical reaction, what is the Term for the statement…’ ‘Nothing is created or destroyed with a chemical Reaction.’

  12. 3,2 closed A __________ system is one where no matter is allowed to enter or leave. (Example: A sandwich decaying in a sealed Bag.)

  13. 3,3 Chemical Changes Combustion, electrolysis, oxidation (rusting), and tarnishing are all examples of what kind of a reaction?

  14. 3,4 Inhibitor (Food preservatives) A material used to decrease the rate of a reaction is called a/an __________. (Also, give an example of one.)

  15. 4,1 Reactants The materials that go into a chemical reaction are known as the ___.

  16. 4,2 activation The minimum amount of energy needed to get a chemical reaction started is known a the ______ energy.

  17. 4,3 Chemistry The study of matter and how matter changes is called ______.

  18. 4,4 1 point Extra Credit 1 Extra Credit Point for the LUCKY TEAM who received this question.

  19. 5,1 2 H2 + O2 -------> 2 H20 Balance the Equation H2 + O2 -------> H20

  20. 5,2 endothermic A chemical reaction where energy is absorbed is called an ____ reaction.

  21. 5,3 State of matter change, color change, smell, temperature change… State TWO pieces of evidence indicating a chemical change.

  22. 5,4 Run electric current through them What can be done to separate water into its reactants again? (This means the water is changed back into Hydrogen and oxygen (gases.)

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