The internal energy can be increased by ________. (a) ...

[2125004343]

The internal energy can be increased by ________.
 
  (a) transferring heat from the surroundings to the system
   (b) transferring heat from the system to the surroundings
   (c) doing work on the system
 
  A) a only
  B) b only
  C) c only
  D) a and c
  E) b and c

Question 2

Pb (as Pb2+) is
 
  A) toxic at all concentrations.
  B) safe at all concentrations.
  C) toxic at high concentrations but not at low concentrations.
  D) toxic to children but not to adults at high concentrations.

Question 3

Rank the penetrating power of nuclear radiation from the least to most penetrating.
 
  What will be an ideal response?

[krakiolit]

Answer to Question 1

D

Answer to Question 2

C

Answer to Question 3

(Most penetrating) Gamma rays, beta particles, alpha particles (Least penetrating)

[2125004343]

Wow, this really help

[alvinum]

Thanks for the timely response, appreciate it