Author Question: Choose the reaction that illustrates Hf for Ca(NO3)2. A) Ca(s) + N2(g) + 3O2(g) Ca(NO3)2(s) B) ... (Read 78 times)

jwb375 · **on:** Aug 27, 2018

Choose the reaction that illustrates Hf for Ca(NO3)2.

A) Ca(s) + N2(g) + 3O2(g) Ca(NO3)2(s)
B) Ca2+(aq) + 2 NO3-(aq) Ca(NO3)2(aq)
C) Ca(s) + 2 N(g) + 6 O(g) Ca(NO3)2(s)
D) Ca(NO3)2(aq) Ca2+(aq) + 2 NO3-(aq)
E) Ca(NO3)2(s) Ca(s) + N2(g) + 3O2(g)

Question 2

How would the concentration change if a 1.0 L flask of 1.0 M NaCl were left uncapped on a laboratory bench for several days. Why?

What will be an ideal response?

Pariscourtney · **Reply #1 on:** Aug 27, 2018

Answer to Question 1

A

Answer to Question 2

The concentration would slowly increase as water from the solution evaporated. This is because the amount of NaCl in the flask would remain constant while the amount of water decreases.