2Nd Nine Weeks Test Review

2nd Nine Weeks Test Review

Matching

Match the terms below with their correct definitions.

____1.A reaction in which a single compound breaks produces two or more simpler substances

____2.A number written in front of a chemical formula

____3.A statement that uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction

____4.A reaction in which oxygen combines with a substance and releases heat and light energy

____5.A reaction in which the atoms of one element replace the atoms of another element in a compound

____6.A reaction involving the exchange of positive ions between two compounds dissolved in water

____7.The process by which the atoms of one or more substances are rearranged to form different substances

____8.A starting substance in a chemical reaction

____9.A substance formed during a chemical reaction

____10.A reaction in which two or more substances combine to form one new compound

Assume that Q, T, X, and Z are symbols for elements. Match each equation with the reaction type.

____11.Q + XZ X + QZ

____12.Q + Z QZ

____13.QT Q + T

____14.QT + XZ QZ + XT

Add the appropriate coefficient to balance the following chemical equations.

15.

16.

17.

18.

19.

20.

21.In a laboratory, 178.8 g of water is separated into hydrogen gas and oxygen gas. The hydrogen gas has a mass of 20.0 g. What is the mass of the oxygen gas produced? Write an equation showing conservation of mass of reactants and products.

22. According to the law of conservation of mass, how much zinc was present in the zinc carbonate? ______

23. When 50 mL of isopropyl alcohol (39.5 g) is added to 50 mL of water (50 g), the mixture will have a volume of 98 mL. What is the mass in grams of this mixture? Record your answer to the nearest tenth on the answer document.

Identify the type of reaction for the following chemical equations:

24. ______P4 + O2 → P2O5

25. ______Fe + H2SO4 → Fe2(SO4)3 + H2

26. ______Pb(NO3)2 → PbO + NO2 + O2

27. ______Fe2(SO4)3 + KOH → K2SO4 + Fe(OH)3

28. ______C2H5OH + O2 → CO + H2O

29. Define the Law of Conservation of Mass:

30.If all the reactants in a chemical reaction arecompletely used, which of the following statements accurately describes therelationship between the reactants and theproducts?

AThe products must have a differentphysical state than the reactants.

B The total mass of the reactants mustequal the total mass of the products.

CThe reactants must contain more complexmolecules than the products do.

DThe density of the reactants must equalthe density of the products.

2nd Weeks Test Review

Answer Section

MATCHING

1.ANS:A

2.ANS:D

3.ANS:B

4.ANS:E

5.ANS:G

6.ANS:H

7.ANS:C

8.ANS:J

9.ANS:I

10.ANS:F

11.ANS:C

12.ANS:D

13.ANS:A

14.ANS:B

PROBLEM

15.ANS:

16.ANS:

17.ANS:

18.ANS:

19.ANS:

20.ANS:

21.ANS:

Masswater = Masshydrogen + Massoxygen; 178.8 g water = 20.0 g hydrogen

+ Massoxygen; Massoxygen = 178.8 g – 20.0 g; Massoxygen = 158.8 g

22.ANS:

8.4 g carbon/20.0 g sucrose  100% = 42.00% carbon

23.ANS:

51.30% oxygen = Massoxygen/20.0 g sucrose  100%;

51.30% oxygen  20.0 g sucrose/100% = Massoxygen = 10.3 g