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Transcript
Name__________________________________Period_______Date_________ Chemical Reactions Directions: Read 260-267 in your textbook, and then answer the following questions: 1. List four observations that indicate that a chemical reaction may be taking place. 2. List the three requirements for a correctly written chemical equation. 3. List the seven elements that normally exist as diatomic molecules. 4. a. What is meant by the term coefficient in relation to a chemical equation? b. How does the presence of a coefficient affect the number of atoms of each type in the formula that the coefficient precedes? 5. In each of the following formulas, write the total number of atoms present. ________________ a. 4SO2 ________________ b 8O2 ________________ c. 3Al2(SO4)3 6. Match the symbol on the left with its appropriate description on the right. _____ (a) A precipitate forms. _____ (b) A gas forms. _____ (c) A reversible reaction occurs. _____ (l) (d) Heat is applied to the reactants. _____ (aq) (e) A chemical is dissolved in water. _____ (f) A chemical is in the liquid state. _____ 7. Which of the following is true regarding the law of conservation of mass? a. It dictates that the number of molecules on each side of a chemical equation must be the same. b. It dictates that the number of atoms of each element must be the same on both sides of a chemical equation. c. It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed. d. It does not apply to chemical reactions. _____ 8. Which of the following may indicate that a chemical reaction has occurred? a. release of energy as light b. a color change c. gas bubble formation d. All of the above _____ 9. Which of the following is a product in the reaction described by the word equation: iron + copper(II) sulfate → iron(II) sulfate +copper a. iron(II) sulfate b. copper c. iron d. Both (a) and (b) _____ 10. What does CH4 represent in the balanced chemical equation shown below? C + 2H2 → CH4 a. one atom of CH4 b. five atoms of CH4 c. one molecule of CH4 d. 1 g of CH4 _____ 11. In writing a chemical reaction that produces hydrogen gas, the correct representation of hydrogen gas is: a. H c. 2H b. H2 d. OH