Identify each of the following materials as either element or compound. 30. Carbon 31. Water 32. Aluminum foil 33. Sodium chloride 34. Tin 35. Silicon dioxide 36. Carbon dioxide

a c c d a

Explanation:

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally