A chemist is given an unknown sample. Which of her observations ...

[bclement10]

A chemist is given an unknown sample. Which of her observations is not a physical property?
 
  A) The sample is a colorless liquid.
  B) The sample has an odor similar to gasoline.
  C) The sample is flammable.
  D) The sample size is 55 mL.
  E) The density of the liquid is 0.789 g/mL.

Question 2

Why does the rate of effusion increase with a decrease in the molar mass?
 
  What will be an ideal response?

[Ksanderson1296]

Answer to Question 1

C

Answer to Question 2

The rate of effusion depends on the speed of the gas particles. As the molar mass decreases at a given temperature, the average speed of the particles increases, increasing the rate of effusion.

[bclement10]

Thanks

[Ksanderson1296]

Welcome