2nd Semester Final Exam Practice Test

2014

38 Questions

30 minutes

1. Which does NOT indicate a phase change?

A. A piece of aluminum is heated to it melting point.

B. A liquid is cooled slowly until it turns into a solid.

C. A rock is crushed into a fine sand

D. Water is left in a cup and slowly dissappears.

25 Seconds

2. What affects the speed of a chemical reaction by decreasing the activation

energy of the reaction?

A. Temperature

B. Catalyst

C. Grinding

D. Stirring

20 Seconds

3. What phase(s) of matter is present at .9 atm & 50⁰C?

A. Solid B. Liquid

C. Gas

25 Seconds

4. What is the relationship between Avogadro’s number and H2O?

A. 18.0 g of H2O

B. 22.4 L of H2O

C. 6.02 X 1023 particles of H2O

15 Seconds

5. How much heat is lost to change 12.5 g of H2O (4.184 J/g(°C)) from 80.0°C to

50.0°C?

A. -2620J

B. 2620 J

C. -1570 J

D. 1570 J

1 minute; 15 seconds

6. What is the change in temperature if 95.3 g sample of water gains 1250 J of

energy? Remember the specific heat of water is 4.184 J/g(°C)

A. -95.3 °C

B. 28,471.6 °C

C. 3.13 °C

D. 54.9 °C

1 minute; 15 seconds

7. What is the pressure at the normal melting and boiling point of water?

A. 0 atm C. 0.006 atm

B. 1 atm D. 225 atm

20 Seconds

8. Is the process when a gas changes into a liquid endothermic or exothermic?

H2O(g) H2O(l)

A. Endothermic

B. Exothermic15 Seconds

9. What change takes place when gas at .8atm & 100⁰ C is cooled to 50⁰C?

A. Freezes C. Sublimes

B. Condenses D. Vaporizes

25 Seconds

10. What is the molar volume of a gas?

A. 18.0 g

B. 22.4 L

C. 6.02 X 1023 particles

15 Seconds

11. How many grams are in 2.5 moles of BrO2?

A. 0.022 grams

B. 280 grams

C. 0.034 grams

D. 240 grams

1 minute

12. What is the molar mass of H2SO4?

A. 98.1 grams

B. 145.2 grams

C. 194.4 grams

D. 259.8 grams

45 seconds

13. Reduction is the process by which a substance _____________.

A. Loses one or more electrons

B. Gains one or more electrons

C. Gains one electron

D. Loses one electron

20 seconds

14. Calculate the molarity of a 50.0 g sample of NaCl that is mixed in 150mL of

water.

A. 0.057 M

B. .13 M

C. .13 m

D. 5.7 M

1 minutes 15 seconds

15. Using the equation below, how many grams of NaOH are needed to produce

30.8 L of Na2SO4?

H2SO4 + 2NaOH 2H2O + Na2SO4

A. 110. g

B. 55.0 g

C. 27.5 g

D. .0172 g

1 minute and 30 seconds

16. Using the equation below, how many grams of H2SO4 will you get if you have

58.5 g of NaOH?

H2SO4 + 2NaOH 2H2O + Na2SO4

A. 71.7 g

B. 143 g

C. 287 g

D. 23.9 g

1 minute 30 seconds

17. Base off of Charles’ Law, what happens to a balloon when the

temperature is decreased?

A. The balloon popped

B. The balloon got bigger (increase volume)

C. The balloon got smaller (decrease volume)

D. The balloon volume didn’t change.

25 seconds

18. How much heat will be released if 9.0 g of Na reacts with excess O2?

2Na + O2 Na2O H = -60 kJ

A. 23 kJ

B. -23 kJ

C. 12 kJ

D. -12 kJ

1 minute 15 seconds

19. A gas mixture contains the following gases with the mole fractions indicated: CH4

(0.380), C2H6 (0.325), C3H8 (0.009), and C4H10 (0.057). The mixture also contains C2H2. What is the mole fraction of C2H2?

A. 6.34 X 10-5

B. 0.522

C. 0.571

D. 0.229

40 seconds

20. A sealed plastic bottle has a volume of 2 L at a temperature of 35°C, what is

the temperature if the volume decreases to 1.5 L?

A. -42°C

B. 17°C

C. 231°C

D. .09°C

1 minute

21. A 20. L balloon at standard atmospheric pressure is squeezed and causes a new pressure of 900. mmHg.

What is the new volume of the balloon?

A. 17 L

B. .020 L

C. 24 L

D. .87 L

1 minute

22. 1.5 moles of a gas at 2.3 atm is in a 4.5 L container. What is the

temperature of the gas?

A. 84 ⁰ CB. 84 K

C. 16 ⁰ CD. 16 K

1 minute 15 seconds

23. What is the % by mass of Mn in MnO4?

A. 76.3%

B. 76.4%

C. 46.2%

D. 49.1%1 minute 15 seconds

24. According to Le Chatelier’s principle, a decrease in the concentration of a

product will cause a reaction to:

A. shift to the left

B. shift to produce more of the reactants

C. consume what is left of the products

D. shift to produce more of the products

30 seconds

25. What is the pH of 0.300 M Sr(OH)2

A. 13.8

B. .222

C. .523

D. 13.560 Seconds

26. Systems in nature tend to undergo changes toward

A. higher entropy and higher energy

B. lower entropy and lower energy

C. higher entropy and lower energy

D. lower entropy and higher energy

20 Seconds

27. Fe + 3Cl2 2FeCl3Which way does the reaction shift when you take away some FeCl3

A. Left

B. Right

C. No Shift

20 seconds

28. Fe + 3Cl2 2FeCl3Which will result in an increase in

concentration of FeCl3?

A. Decrease Fe

B. Decrease the pressure

C. Increase Cl2

D. Change the temperature

20 seconds

29. In a direct combination reaction,

A. an element is reduced and the other one

is oxidized

B. all elements are oxidized

C. all elements are reduced

D. it has nothing to do with a redox reaction

20 seconds

30. Which of the following is a property of an acid?

A. Bitter taste

B. Slippery

C. Good conductor of electricity

D. Soothes sunburns

15 seconds

31. The kinetic molecular theory assumes that the particles of an ideal

gas

A. Exert no force on one another

B. Have a volume close to 1

C. Exert great forces on each other during

collisions

A. Move in specific patterns

25 seconds

32. A weak acid . . .

A. totally dissociates in water

B. doesn’t conduct electricity

C. produces H+ ions that form H3O+ ions

D. makes the water basic

15 seconds

33. The end point and equivalence point in an acid base reaction should be

A. at the same point

B. at a difference of 1

C. have pH’s of 6 and 8

D. a point with a concentration of 1.0 M

15 seconds

34. Which is a neutralization reaction?

A. when a carbon compound burns in O2

B. when a molecule splits into its parts

C. when a single replacement reaction takes

place.

D.when H+ ions react with OH- ions

20 seconds

35. In the following reaction, label the oxidation state (number) of

each element before and after the reaction:

2 C2H2 + 5 O2 4 CO2 + 2 H2O

H = H =

O = O =

C = C =

1 ½ minutes

36. Based off of your answers to the previous question, what element(s) are being reduced when the product

is produced? Oxidized?

2 C2H2 + 5 O2 4 CO2 + 2 H2O

A. reduced = C, oxidized = OB. reduced = O, oxidized = CC. reduced = H, oxidized = OD. reduced = O, oxidized = H

30 sec

37. A sample of HCl is considered to be an Arrhenius acid because it dissolves in

water to yield

A. OH+ ions as the only positive ions

B. HCl molecules to make it acidic

C. Cl- ions as the only negative ions

D.H+ ions as the only positive ions

20 seconds

38. What is the hydronium ion concentration when a solution changes

from a pH of 6 to 2?

A. 10,000 times the original content

B. 1,000 times the original content

C. 100 times the original content

D.10 times the original content

45 seconds

Answer Key

1.C 7. B 13. B 19. D25. D

31. A

2. B 8. B 14. D 20. A 26. C 32. C

3. B 9. B 15. A 21. A 27. B 33. A

4. C 10. B 16. A 22. B 28. C 34. D

5. C 11. B 17.C 23. C 29. A

6. C 12. A 18. D 24. D 30. C

Answer Key

38. A

35. H = +1 & +1

O = 0 & -2

C = -1 & +4

36. B

37. D