Chemistry 152 Exam 4b Pp. 2 Multiple Choice (4 points each) 6. At constant tempe

Question

Chemistry 152 Exam 4b Pp. 2 Multiple Choice (4 points each) 6. At constant temperature and pressure a the volume of a gas varies as the number of moles b. the volume of a gas varies inversely as the number of moles c. the volume of a gas is unrelated to the number of moles d,the volume of a gas is constant 7. At constant pressure and number of moles a. the volume of a gas varies as the absolute temperature b. the volume of a gas varies inversely as the absolute temperature c. the volume of a gas varies as the Celsius temperature d. the volume of a gas varies inversely as the Celsius temperature 8. STP means a. constant temperature and pressure b. 1.00 atm and 273.15K c. 1.00 atm and 0 K d. it doesn't mean anything 9. Which of the following should be the conjugate of C,HsO2 (a weak base) a. C3HsO22 HGH,02 c. C3H402 d. it doesn't have a conjugate 10. A buffer a. keeps pH at neutral b. keeps pH constant c. slows changes in pH d. is made from water

Explanation / Answer

6. Use the ideal gas equation to know the relation to identify.

PV = nRT is the ideal gas equation

When P and T are constant then V = nR, since R is a constant V is proporitnal to n . The correct option is A.

7. At constant P and n , PV = nRT becomes V = RT. It means volume is proportional to T. The correct option is a.

T is absolute temperature but not Celcius temperature.

8. STP means standard temperature (273.15 K)and pressure ( 1.00 atm). The correct option is b

9. The ion formed when an acid lose one proton is conjugate base. HC3H5O2 is acid, when it lose H^+, C3H5O2^- is fomred.

10. A buffer resists change in pH of the solution upon addition of samll amount of acid or base. Thus, a buffer keep a constant pH. The correct option is "b".

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