Organic and Nuclear

_____1. Identify the structure ||

CH3—C—CH2—CH3

29.The organic compound represented above is an example of

(A) an organic acid(B) an alcohol

(E) a ketone

_____2. If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?

(A) 6 days(B) 8 days(C)12 days

(D) 14 days(E) 21 days

_____3. Correct statements about alpha particles include which of the following?

I. They have a mass number of 4 and a charge of +2.

II. They are more penetrating than beta particles.

III They are helium nuclei.

(A) I only(B) III only(C)I and II

(D) I and III(E) II and III

_____4. A hydrocarbon gas with an empirical formula CH2 has a density of 1.88 grams per liter at 0C and 1.00 atmosphere. A possible formula for the hydrocarbon is

(A) CH2(B)C2H4(C)C3H6

(D) C4H8(E)C5H10

_____5. Which of the following pairs of compounds are isomers?

(A)CH3-CH2-CH2-CH3 and CH3-CH-CH3

CH3

(B)CH3-CH–CH3 and CH3-C=CH2

 

CH3 CH3

(C)CH3-O-CH3 and CH3--CH3

(D)CH3-OH and CH3-CH2-OH

(E)CH4 and CH2=CH2

_____6. The nuclide a(249, 96)Cm is radioactive and decays by the loss of one beta (e–) particle. The product nuclide is

(A) a(245, 94)Pu(B) a(245, 95)Am(C)a(248, 96)Cm

(D) a(250, 96)Cm(E) a(249, 97)Bk

_____7. For the types of radiation given, which of the following is the correct order of increasing ability to penetrate a piece of lead?

a. Alpha particles < gamma rays < beta particles

b. Alpha particles < beta particles < gamma rays

c. Beta particles < alpha particles < gamma rays

d.Beta particles < gamma rays < alpha particles

e. Gamma rays < alpha particles < beta particle

_____8. The structural isomers C2H5OH and CH3OCH3 would be expected to have the same values for which of the following? (Assume ideal behavior.)

a. Gaseous densities at the same temperature and pressure

b. Vapor pressures at the same temperature

c. Boiling points

d. Melting points

e. Heats of vaporization

_____9. Which of the following conclusions can be drawn from J. J. Thomson’s cathode ray experiments?

a. Atoms contain electrons.

b. Practically all the mass of an atom is contained in its nucleus.

c. Atoms contain protons, neutrons, and electrons.

d. Atoms have a positively charged nucleus surrounded by an electron cloud.

e. No two electrons in one atom can have the same four quantum numbers.

_____10. 2 n + + _?

What is the missing product in the nuclear reaction represented above?

a. c. e.

b. d.

_____11. Which of the following represents a pair of isotopes?

Atomic Mass

Number Number

(A) I. 6 14

II. 7 14

(B) I. 6 7

II. 14 14

II. 14 28

(D) I. 7 13

II. 7 14

(E) I. 8 10

II. 16 20

_____12. When decays, the emission consists consecutively of an  particle, then two  particles, and finally another  particle. The resulting stable nucleus is

(A) (C) (E)

(B) (D)

_____13. The radioactive decay of to occurs by the process of

(A) beta particle emission (D) electron capture

(B) alpha particle emission(E) neutron capture

_____14 Ca, V, Co, Zn, As

Gaseous atoms of which of the elements above are paramagnetic?

(A) Ca and As only(D) V, Co, and As only

(B) Zn and As only(E) V, Co, and Zn only

(

(D)