devry chem120 week 4 quiz latest 2016 july

devry chem120 week 4 quiz latest 2016 july

1. Question : (TCO 6) A sample of helium gas occupies 520 mL at 79 mmHg. For a gas sample at constant temperature, determine the volume of helium at 45 mmHg.

Question 2. Question : (TCO 6) A gas at a temperature of 105 degrees C occupies a volume of 250 mL. Assuming constant pressure, determine the volume at 10 degrees C.

Question 3. Question : (TCO 6) For a gas at standard temperature and pressure with a density of 3.5 g/L, determine its molar mass.

Question 4. Question : (TCO 6) Calculate the volume, in liters, of a 1.5 mol H2S(g) at 50 degrees C and 2 atm.

Question 5. Question : (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the acid? H3O+ + H2PO4-à H3PO4 + H2O

H2O

H3O+

H3PO4

H2PO4-

none of the above

Question 6. Question : (TCO 8) According to the Bronsted-Lowry definition, which chemical in the following reaction is the base? CO32-

+ H2O -> OH- + HCO3-

OH-

HCO3-

CO32-

H2O

none of the above

Question 7. Question : (TCO 8) What is reduced in the following reaction? Cl2

+ 2 NaBr -> 2 NaCl + Br2

NaCl

Br2

NaBr

Cl2

none of the above

Question 8. Question : (TCO 8) What is reduced in the following reaction? 2 Bi + 3 Mg2+ à 2 Bi3+ + 3 Mg

Mg

Bi

Mg2+

Bi3+

none of the above

Question 9. Question : (TCO 8) What is the pH of a solution with a [H3O+] of 1 x 10-3 M?

-5.0

3

-10.0

5.0

none of the above

Question 10. Question : (TCO 8) What is the pH of a solution with a [H3O+] of 1 x 10-10 M?

-5.0

10.0

-10.0

5.0