A. Multiple Choice. Read the following statements carefully and try to answer the given questions. Write the letter of your answer in the space provided before each number. (1 point each) 1. Which of these represents a synthesis chemical reaction? a. X + Y - XY C. XY + ZX + ZY b. XY X+Y d. XY + ZW+XW + ZY 2. During a chemical reaction a. atoms are destroyed b. atoms are rearranged C. elements are destroyed d. new elements are produced 3. What are the products in the equation below? Zn + CuSO4 -----> ZnSO4 + Cu + a. Zn and Cu b. ZnSO4 and Cu C. Zn and Cuso. d. Zn only 4. Quicklime (Ca0) used as a drying agent. When water is added to this, slaked lime Ca(OH)2 is formed. What type of reaction is this? a combination b. single displacement C. decomposition d. double displacement _5. In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants? a. hydrogen only c. both hydrogen and oxygen b. oxygen only d, water _6. Combination reaction always a. requires oxygen gas b. involves an element and ionic compound c. form only one product d. use only one reactant _7. In the following chemical reaction, what product is represented by X? AICI + NaOH X + Naci a. AIOH b. Al OH c. it cant be determined d. Al(OH): _8. One clue of a chemical change is the formation of a precipitate. A precipitate is formed when a. Two liquids react and a gas is produced b. A solid dissolve in a liquid C. One liquid dissolves in another d. Two liquids react and a solid is formed _9. In a chemical reaction a. The atoms of the reactants always stay together to form the products b. The atoms of the reactants unbond, rearrange, and then rebond to form the products c. New atoms are formed which combine to make the products d. Some atoms disappear while others multiply to form the products 10. If more reactants are used in a chemical reaction, more products will be produced. This is because a. More reactants cause the reaction to heat up b. More reactants take up the same volume c. More reactants have more atoms to react to for more products d. Too many products can slow down the reaction