The answer is B, the electrolysis of water. One cannot be the answer since the condensation of steam requires a loss of heat, an exothermic reaction. Numbers 2 and 3 cannot be correct either as they do not indicate energy in the chemical equation, and so it must be balanced throughout. Meaning that the only possible answer is B.
Alkali: Group 1(I A). Halogens: group 17 (VII A)
Answer:
A. Polar regions receive less solar energy and heat per unit area than tropical regions.
Explanation:
The sun is lower in the sky the farther away from the equator you go (at higher latitudes), so the solar energy is less direct. Climate in areas with less direct solar input tends to be generally cooler.
Answer:
2Fe + 8HCl =2 HFeCl4 + 3H2
Explanation:
Fe + HCl = HFeCl4 + H2
1Fe 1Fe
1H 3H
1Cl 4CL
2Fe + 8HCl =2 HFeCl4 + 3H2
2Fe 2Fe
8H 8H
8Cl 8CL
