13. how many protons are present in total in a carbon atom?
(a) there are always twelve.
(b) there are always six.
(c) it depends on the isotope.
(d) there are always four.

14. of the following, which molecule is most polar? (the electronegativities of the atoms are as follows: chlorine 3.0, boron 2.0, hydrogen 2.1, oxygen 3.5, carbon 2.5, and bromine 2.8.)

The answer to your question is below

13.- b

Explanation:

13. How many protons are present in total in a carbon atom?

(a) There are always twelve.  No, atomic mass of Carbon is 12 but the number of protons is half the atomic mass (6).

(b) There are always six.  The answer is correct. Carbon's atomic number is 6, that means that it has 6 protons.

(c) It depends on the isotope.  It's wrong, depends on the isotope the number of neutrons but not the number of protons.

(d) There are always four.  No, 4 is the number of protons of Beryllium.

14. Of the following, which molecule is most polar? (The electronegativities of the atoms are as follows: chlorine 3.0, boron 2.0, hydrogen 2.1, oxygen 3.5, carbon 2.5, and bromine 2.8.)

Oxygen, because of these elements is the one with the highest electronegativity.

s too much pool water may lead to chlorine poisoning. the concentration of chlorine in public drinking water is extremely low and not harmful to human health. sooo yeahh

explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.