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Equations Review

Equations Review. A _________ is a substance that speeds up a chemical reaction without being permanently consumed in the reaction. catalyst. List the naturally occurring diatomic molecules. H 2 , O 2 , N 2 , Cl 2 , Br 2 , I 2 , F 2.

elaine-lowery
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Equations Review

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  1. Equations Review

  2. A _________ is a substance that speeds up a chemical reaction without being permanently consumed in the reaction. • catalyst

  3. List the naturally occurring diatomic molecules. • H2, O2, N2, Cl2, Br2, I2, F2

  4. Using collision theory, EXPLAIN why increasing the temperatureof a reaction increases the reaction rate? • Increasing the temperature also increases the kinetic energy of the reacting molecules. So molecules are moving faster and will collide more often. More collisions = faster reaction rate!

  5. _____________ is the speed of the disappearance of a reactant or the rate of the appearance of a product in a chemical reaction. • Reaction rate

  6. Equations must always be balanced because a certain law of chemistry cannot be violated. What is the name of the law that cannot be violated? • Law of Conservation of Matter

  7. The arrow between the reactants and products means__________. • yields

  8. List the four indicators that a chemical reaction occurred. • Heat/light • Precipitate • Gas (bubbles) • Color change

  9. In a chemical equation, what is indicated by the  symbol? • Heat is added to the reaction

  10. In a chemical equation, what is indicated by the symbol? • A precipitate is formed

  11. What are the 4 factors that affect the reaction rate? • Temperature • Concentration • Nature of Reactants • Catalyst

  12. List the reactants in the following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • CH4 + 2O2

  13. Using collision theory, EXPLAIN why increasing the concentration of a reactant increases the reaction rate? • More molecules are present as the concentration is increased. So more molecules present equals more collisions between reacting molecules. More collisions = faster reaction rate!

  14. In a chemical equation, what is indicated by the H2SO4symbol? • That H2SO4 was used as a catalyst is this reaction

  15. List the products in the following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • CO2 + 2H2O

  16. How many atoms of O are in 2H2O following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 2

  17. What is does the represent in the following equation: 2H2 + O2 2H2O A reversible reaction. The reaction can go both ways- reactants yield products and product can yield reactants

  18. What type of reaction would the following be classified as? AB + CD AD + CB • Double displacement

  19. Suppose in the following reaction that 10g of Mg was added to 14g of O2, how many grams of MgO would be produced?2Mg (s) + 2O2 (g) 2MgO (s) 24 g – b/c the Law of Conservation of Matter (the amount of matter you start with is the same amount that you end with!)

  20. How many atoms of C are in CO2 following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 1

  21. How many moles of CH4 are present following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 1

  22. What ions are present for H20? • H+ and OH-

  23. How many molecules of 2O2 are present following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 2

  24. Which of the following substances would be a gas that is produced in the following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • CO2

  25. What type of reaction would the following be classified as? A + B AB • Synthesis

  26. Which type of reaction has only one REACTANT? • Decomposition

  27. What type of reaction would the following be classified as?A + BC AC + B Single displacement

  28. Which of the following substances would be a liquid in the following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 2H2O

  29. How many molecules of CH4 are present following equation:CH4 (g) + 2O2 (g) CO2 + 2H2O (l) • 1

  30. What ion is ALWAYS present in any acid? • H+

  31. Which type of reaction has only one PRODUCT being produced? • Synthesis

  32. What does (aq) represent after a substance? • Aqueous – substance was dissolved in water

  33. Is the following reaction correct? Explain.2Mg (s) + 2O2 (g) 2PbO (s) NO! – b/c the Law of Conservation of Matter (the same types of atoms must be present on both sides of the equation. Mg can’t be changed into Pb!

  34. What type of reaction would the following be classified as? AB A + B • Decomposition

  35. Balance the following equation:potassium + water potassium hydroxide + hydrogen 2K + 2H2O 2KOH + H2

  36. Balance the following equation:fluorine + aluminum oxide aluminum fluoride + oxygen 6F2 + 2Al2O34AlF3 + 3O2

  37. Identify the type of reaction. Finish the word equation & write the balanced equation:Aluminum + hydrochloric acid Single Displacement Aluminum chloride + hydrogen 2Al + 6HCl 2AlCl3+ 3H2

  38. Identify the type of reaction. Finish the word equation & write the balanced equation:calcium fluoride + water Double Displacement Calcium hydroxide + hydrogen fluoride CaF2 + 2H2O Ca(OH)2+ 2HF

  39. Identify the type of reaction. Finish the word equation & write the balanced equation:potassium oxide Decomposition potassium + oxygen 2K2O 4K + O2

  40. Identify the type of reaction. Finish the word equation & write the balanced equation:strontium + chlorine synthesis Strontium chloride Sr + Cl2SrCl2 *Balanced

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