A glass flask has a volume of 500 mL at a temperature of 20 C. ...

[Medesa]

A glass flask has a volume of 500 mL at a temperature of 20 C. The flask contains 492 mL of mercury at an equilibrium temperature of 20C.
 
  The temperature is raised until the mercury reaches the 500 mL reference mark. At what temperature does this occur? The coefficients of volume expansion of mercury and glass are 18 10-5 K-1 (mercury) and 2.0 10-5 K-1 (glass).
  A) 120C
  B) 110C
  C) 100C
  D) 140C
  E) 130C

Question 2

Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you.
 
  How much of this isotope will you have 3 days after it was delivered to you?
  A) more than 2.5 grams but less than 5 grams
  B) 2.5 grams
  C) 1.25 grams
  D) more than 1.25 grams but less than 2.5 grams
  E) less than 1.25 grams

[Bsand8]

Answer to Question 1

A

Answer to Question 2

E

[Medesa]

TYSM

[diana chang]

Excellent