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Physical Science Chemical Reactions Worksheet #2 Directions - Read through each statement. Label your science journal Worksheet #2. Write #1 with the answer (a,b,c,d) that you think best completes the question. _____ 1. When one element replaces another element in a compound, the reaction is a ____ reaction. a. synthesis b. single replacement c. double replacement _____ 2. Each substance to the right of the arrow in a chemical equation is a ______. a. catalyst b. precipitate c. reactant d. product _____ 3. Substances that prevent certain chemical reactions are called ________ a. endothermics b. catalysts c. inhibitors d. products _____ 4. A chemical reaction in which the energy released is primarily in the form of heat is a. flammable b. exothermic c. endothermic d. endergonic _____ 5. A substance that speeds up a chemical reaction without undergoing a permanent change itself is a(n) a. inhibitor b. coefficient c. reactant d. catalyst _____ 6. Numbers that precede symbols and formulas in a chemical equation are called ______ a. subscripts b. superscripts c. fractions d. coefficients _____ 7. A chemical rxn in which two or more substances combine to form another substance is a _____ rxn. a. synthesis b. decomposition c. reactant d. product _____ 8. The breaking down of a substance into two or more substances is ____ a. displacement b. synthesis c. decomposition d. endothermic _____ 9. Each substance on the left side of the arrow in a chemical equation is a _______ a. reactant b. product c. coefficient d. catalyst _____ 10. If energy in the form of heat is required for a chemical reaction to take place, the reaction is ____ a. exothermic b. reactant c. balanced d. endothermic _____ 11. In a chemical equation, the symbol that means “dissolved in water” is _____. a. (s) b. (clear) c. (aq) d. (g) ______12. What type of reaction is shown in the chemical equation NH3 + HCl NH4Cl? a. synthesis b. decomposition c. single-replacement d. double replacement ______ 13. What type of chemical reaction is shown in the equation 2 H2O 2 H2 + O2? a. synthesis b. single replacement c. double replacement d. decomposition _____ 14. Which of the following could represent a single-replacement reaction? a. element + element = compound b. compound = element + element c. element + compound = element + compound d. compound + compound = compound + compound _____ 15. A(n) ___ chemical equation has the same number of atoms of each element of both side of the equation. a. simple b. balanced c. unbalanced d. complex |