Someone wants to sell you a piece of gold that they say is nearly ...

[plus1]

Someone wants to sell you a piece of gold that they say is nearly pure. Before buying the piece, you measure its mass to be 52.3 grams and you find that it displaces 4.16 mL of water.
 
  Calculate its density and assess its purity given the fact that pure gold has a density of 19.3 g/mL. A) The piece of gold is about 65 percent pure.
  B) The piece of gold is only about 12.6 percent pure.
  C) The piece of gold is only about 8 percent pure.
  D) Not enough information is given to calculate the purity, but enough information is given to let you know that the piece is far from pure.

Question 2

You are given three radioactive samples (, , and  ) and can only dispose of one. The other two you must keep, one in your hand, the other in your pocket. How would you minimize your exposure risk?
 
  A) keep  in hand, keep  in pocket, and dispose of  
  B) dispose of , keep  in hand, and keep  in pocket
  C) dispose of , keep  in pocket and keep  in hand
  D) keep  in pocket, dispose of , and keep  in hand
  E) keep  in hand, dispose of , and keep  in pocket

[covalentbond]

Answer to Question 1

D

Answer to Question 2

A