Question

5. Balance the equation and state the limiting reagent in the following reaction:

Al (s) + Cl2 (g) ---> AlCl3 (s)
a. Chlorine
b. Aluminum
c. Aluminum chloride
d. None of the above


6. According to the collision theory, as the pressure increases, the rate of reaction will
a. Remain the same
b. Decrease
c. Increase
d. None of the above


7. Rate of reaction and temperature are ______________.
a. Inversely proportional
b. Directly proportional
c. Not related
d. Both a and b


8. Dynamic equilibrium occurs when
a. the chemical reaction continues to proceed, but the amount of reactants decrease.
b. the chemical reaction stops completely
c. the chemical reaction continues to proceed and the amount of product increases
d. the chemical reaction continues to proceed, but the amount of products and reactants remain constant


9. The addition of a ____________ increases the rate of reaction by providing an alternative pathway with a lower activation energy.
a. Catalyst
b. Acid
c. Base
d. All of the above


10. Which of the following dissociates in water to form the lowest concentration of H+
a. HCl (aq)
b. H2SO4 (aq)
c. HBr (aq)
d. H2CO3 (aq)


11. According to Arrhenius, an acid is a substance that increases the ____________ ion concentration in water.
a. Hydroxide
b. Hydronium
c. Potassium
d. Magnesium


12. A substance has a pH of 7.34. It is considered a
a. Base
b. Acid
c. Amphoteric
d. All of the above


13. Which group of acids listed completely dissociates in water?
a. HCl, H2SO4, HNO3
b. HCl, H2SO4, CH3COOH
c. HCl, H2SO4, H2CO3
d. HBr, H3PO4, H2CO3


14. Which group below correctly list bases that completely dissociate in water?
a. NaOH, KOH, LiOH
b. NH3, NH4OH, HCl
c. NaOH, H3PO4, MgOH
d. NaOH, KOH, H2CO3


15. When the oxidation number increases the element is ____________ and if the oxidation number decreases the element is ____________.
a. reduced, reduced
b. reduced, oxidized
c. oxidized, oxidized
d. oxidized, reduced


16. The oxidation number for O in NaHCO3 is
a. 1-
b. 1+
c. 2-
d. 2+


17. The oxidation number for Na, Cr, and O respectively in the compound Na2CrO4
a. 6+, 1+, 2+
b. 1+, 6+, 2-
c. 2-, 1+, 6+
d. 1-, 2-, 3+


18. CuSO4 + 2NaOH --> Cu(OH)2 + Na2SO4

The reaction above represents
a. Oxidation
b. Reduction
c. Neutralization
d. None of the above


19. A balloon with a volume of 5.0 L is filled with a gas at 2 atmospheres. If the pressure is reduced to 1 atmospheres without a change in temperature, what would be the volume of the balloon?
a. 5.0 L
b. 10 L
c. 12 L
d. 10 ml


20. A 700 mL sample of nitrogen is heated from 37 °C to 77 °C at constant pressure. What is the final volume?
a. 790 L
b. 790 ml
c. 970 ml
d. 970 L


21. A 8.0 L sample at 25 °C and 1.00 atm of pressure contains 0.5 moles of a gas. If an additional 0.75 moles of gas at the same pressure and temperature are added, what is the final total volume of the gas?
a. 20 L
b. 20 ml
c. 30 L
d. 25.5 L


22. 7.2 liters of an ideal gas are contained at 4.0 atm and 27 °C. Using the ideal gas law, calculate how many moles of this gas are present.
a. 22 mol
b. 1.2 L
c. 2.1 mol
d. 1.2 mol

Answer 1

5. 2 Al 3 Cl2 and 2 AlCl3

Cl2 is limiting

(It has the highest coefficients, but that's not always true. If they give you the number of grams for each make sure to work the math out)

6. C

(As the pressure increases there is less volume for the molecules to move around, therefore the molecules will be closer together, allowing for more collisions.)

7. b

(if the temperature is increases so will the rate of the reaction. The increase in temperature will allow for the molecules to move at a faster rate, allowing for more collisions (reactions) between them.

8. d

(dynamic equilibrium is the state at which the reaction is consistently moving, there fore the amounts should remain the same)

9. A

(a catalyst will lower the the pathway of activation energy because it's meant to speed up a reaction)

bro youre on your own after this, im tired