Multiple choice questions in nuclear chemistry1

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Reference no: EM13357055

Multiple choice questions in nuclear chemistry.

1. Magnesium-28 decays via beta emission, which equation represents the balanced nuclear equation?

A.12Mg28 à -1e0 + 14Si28

B.2Mg28 à 2He4 + 10Ne28

C.12Mg28 à 1n0 + 13Al28

D.12Mg28 à -1e0 + 13Al28

E.none of the above

2. Complete the nuclear equation by 86Rn220 à 2He4 + ______ writing the symbol of the missing particle:

A.84Po216

B.84Po214

C.82Pb218

D.82Pb222

E.none of the above

3. Silicon-26 decays via positron emission, which equation represents the balanced nuclear equation?

A.14Si26 à -1e0 + 13Al26

B.14Si26 à 2He4 + 13Al26

C.14Si26 à 1e0 + 13Al28

D.14Si26 à 1e0 + 13Al26

E.none of the above

4. Complete the nuclear equation 10Ne19 à 1e0 + ______ by writing the symbol of the missing particle:

A.9F18

B.10Ne18

C.9F19

D.10Ne19

E.none of the above

5. Argon-37 decays via electron capture emission, which equation represents the balanced nuclear equation?

A.18Ar37 à -1e0 + 17Cl37

B.18Ar37 + -1e0 à 17Cl37

C.18Ar37 + 1e0 à 17Cl37

D.18Ar37 + -1e0 à 16S37

E.none of the above

6. 131I decays with a t1/2 = 8.07 hrs. If we begin with 3.0 mg, how much remains after 6 half-lives?

A.0.0469 mg

B.0.0234 mg

C.0.50 mg

D.0.25 mg

E.0.01875

7. The half-life of Pa-234 is 6.75 hr. Approximately what fraction of a sample of isotope remains after

20.25 hours?

A.¼

B.1/8

C.1/16

D.1/3

E.½

8. The half-life of Rn-222 is 3.823 day. What was the original mass of a sample of this isotope if 0.0500 g

remains after 7.646 day?

A.0.398 g

B.0.199 g

C.0.085 g

D.0.800 g

E.0.042 g

9. The half-life of Th-227 is 18.2 day. How many days are required for 0.70 of a given sample to decay?

A.4 days

B.16 days

C.32 days

D.64 days

E.128 days

10. An object taken from a cave has a carbon-14 fraction which is 0.89 of the amount in a living organism.

How old is the object? (half-life for C-14 is 5730 yr)

A.240 yrs

B.480 yrs

C.960 yrs

D.1920 years

E.3840 years

Reference no: EM13357055

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