When water is changed from a liquid to a vapor the chemical composition of the water does not change. When a water changes from a liquid to a vapor it still has the chemical composition H2O, thus making the change physical.

4 0

3 years ago

Elements that’s are gases, brittle & poor conductors at room temperature are

vlabodo [156]

I think the answer is C for this question

5 0

3 years ago

A mixture initially contains A, B, and C in the following concentrations: [A] = 0.300 M , [B] = 1.05 M , and [C] = 0.550 M . The

Hunter-Best [27]

Answer:

Kc = 9.52.

Explanation:

The equilibrium system:

Kc = [C]/[A][B]²,

Concentration: [A] [B] [C]

At start: 0.3 M 1.05 M 0.55 M

At equilibrium: 0.3 - x 1.05 - 2x 0.55 + x

0.14 M 1.05 - 2x 0.71 M

For the concentration of [A]:

∵ 0.3 M - x = 0.14 M.

∴ x = 0.3 M - 0.14 M = 0.16 M.

∴ [B] at equilibrium = 1.05 - 2x = 1.05 M -2(0.16) = 0.73 M.

∴ Kc = (0.71)/(0.14)(0.73)² = 9.5166 ≅ 9.52.

4 0

4 years ago