Chemistry 1210 Quiz #3A Sept 16, 2002 Dr. B. Jackson

31. Code A

32. Which one of the following has the least penetrating ability?

a) alpha particle b) beta particle c) gamma ray

33. If I had 2000 radioactive atoms with a half life of 2 years, how many radioactive atoms

would remain after 8 years?

a) 500 b) 250 c) 125 d) 68

34. Given 2 2 4

H + H ------> He

1 1 2

This is an example of a) fusion b) fission

35. The formation of ¹⁴C in the atmosphere occurs by the following reaction:

14 1 14

N + n ------------> C + _{-----------------}_

7 0 6

What is the other product besides ¹⁴C?

a) an alpha particle b) a positron c) an electron d) a hydrogen atom

36. What element is formed when

44 0

Ti + β ---------> ?

22 -1

a) Ti b) Sc c) V

37. The above is an example of

a) electron emission b) electron capture c) positron emission

38. From the following decay reaction, give the starting element.

4 222

? -------------> α + Rn

2 86

a) At b) Ra c) Po d) Fr

39. What would be the product if copper (Cu) undergoes positron emission.

a) Ni b) Zn c) Cu

40. How many neutrons are released for the following reaction?

235 1 135 97 1

U + n --------------> I + Y + __----------__ n

92 0 53 39 0

a) 1 b) 2 c) 3 d) 4 e) 0

Ans: 31a; 32a; 33c; 34a; 35d; 36b; 37b; 38b; 39a; 40d

Wednesday, March 21, 2007 01:28:01 PM