Which of the following parts (postulates) of Dalton's atomic ...

[madam-professor]

Which of the following parts (postulates) of Dalton's atomic theory has been modified in light of later discoveries?
 
  A) All matter is made up of very small particles called atoms.
  B) Atoms are indivisible.
  C) Chemical reactions involve rearrangement of atoms.
  D) Compounds are formed from atoms.

Question 2

The equilibrium concentrations for the reaction at 673 K are H2 = 0.63 M, N2 = 0.45 M, and NH3 = 0.24 M. The value of Keq is ________.
 
  N2 (g) + 3H2 (g) = 2NH3 (g)
  A) 0.85
  B) 1.18
  C) 0.51
  D) 1.96

Question 3

Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of magnesium nitride is
 
  A) 1.
  B) 3.
  C) 6.
  D) 8.

[alexanderhamilton]

Answer to Question 1

B

Answer to Question 2

C

Answer to Question 3

A

[madam-professor]

Thank you!

[alexanderhamilton]

Always glad to help...