Which statement best explains why carbon is present in so many kinds of molecules? it has valence electrons. it can form four covalent bonds. it is abundant on earth. it can become an ion.

Answer : The correct option is, it can form four covalent bonds.

Explanation :

Carbon is a non-metal that belongs to group 14 and period 2. The atomic number of carbon is, 6.

The electronic configuration of carbon is,

That means, carbon has 4 valence electrons. So, carbon can bond with another carbon atoms by sharing a maximum of four electrons and carbon can also bond with another different elements by sharing a maximum of four electrons.

And, carbon can also form single, double, or triple bonds with another carbon atom.

Hence, the correct statement is, it can form four covalent bonds.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.