Write balanced chemical reactions for each step in the two-step synthesis of calcium chloride. next, write an overall reaction for the two-step synthesis of aqueous calcium chloride from calcium and hydrochloric acid. you can do this by subtracting one equation from the other. your equations should include the details about state (s), (aq), (g), (l).

For the first reaction: Ca (s) + Cl2 (g) ⇒ CaCl2

For second reaction: Ca (s) + 2HCl (aq) ⇒ CaCl2 (aq) + H2 (g)

Explanation:

1) First you have to write the equations that describes the synthesis of calcium chloride from calcium (Ca) and chlorine (Cl2). The overall reaction can be separated in two semi-reactions, the oxidation of calcium and the reduction of chlorine.

Ca (s) ⇒ Ca+2  + 2e- (oxidation)

Cl2 (g) + 2 e- ⇒ 2Cl-   (reduction)

Ca (s) + Cl2 (g) + 2e- ⇒ CaCl2 (s) + 2e- (overall reaction)

Summarizing Ca (s) + Cl2 (g) ⇒ CaCl2

2) In the second part you must consider the reaction of Calcium and hydrochloric acid to form aqueous calcium chloride.

Ca (s) ⇒ Ca+2 + 2e-

2HCl (aq) ⇒ 2H+ (aq)  + 2Cl- (aq)

Ca (s) + 2HCl (aq) ⇒ CaCl2 (aq) + H2 (g)

the answer would be b i believe

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.