Test - 2. Select and underline the letter of the best answer. 1. In a decomposit

Question

Test - 2. Select and underline the letter of the best answer.

1. In a decomposition reaction, a. 2 or more substances combine to form a more complex substance b. a compound breaks down into two or more simple substances c. ions from two compounds are interchanged d. one element displaces another element

2. In a metathesis reaction, a. 2 or more substances combine to form a more complex substance b. a compound breaks down into two or more simple substances c. ions from two compounds are interchanged d. one element displaces another element

3. Salt is a product of _______ reaction a. combination b. decomposition c. displacement d. metathesis

4. Give the correct coefficients ( number before each chemical formula ) for the chemical reaction – Ca + H3PO4 Ca3(PO4)2 + H2 a. 2,3,1,3 b. 3,2,3,1 c. 3,2,1,3 d. 2,3,3,1

5. A reaction that occurs in the stomach when milk of magnesia,Mg(OH)2 is used as an antacid is known as ___________ reaction. a. combination b. decomposition c. neutralization d. displacement

6. Which of the following is not correctly balanced? a. Al + 3HCl AlCl3 + H2 c. 4Fe + 3O2 2Fe2O3 b. HCl + NaOH NaCl + H2O d. N2 + 3H2 2NH3

7. Calcium hydroxide plus sulfuric acid will yield a. calcium sulfate and hydrogen c. calcium sulfate and water b. calcium oxide and sulfur d. calcium sulfate and sulfurous acid

8. Balancing an equation involves a. adjusting the subscripts c. adjusting both subscripts and coefficients b. adjusting the coefficients d. adjusting the masses of reactants and products

9. The correct coefficients for the equation, KClO3 KCl + O2 is a. 2,2,3 b. 3,2,2 c. 2,3,2 d. 2,1,3

10. 2HCl + Mg(OH)2 MgCl2 + 2H2O is classified as a. combination reaction c. replacement reaction b. decomposition reaction d. metathesis reaction

Explanation / Answer

1. b. a compound breaks down into two or more simple substances

2. c. ions from two compounds are interchanged

3. c. displacement

4. 3Ca + 2H3PO4 ---> Ca3(po4)2 + 3H2

answer: 3,2,1,3

5. c. neutralization

6. a. Al + 3HCl AlCl3 + H2

7. c. calcium sulfate and water

8. b. adjusting the coefficients

9.   a. 2,2,3

10. d. metathesis reaction

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