If a carbon hydrate has 10 carbon what other elements would be present?

10 hydrogen, 20 nitrogen

10 oxygen, 20 nitrogen

10 oxygen, 20 hydrogen

10 hydrogen 10 nitrogen

In addition to the 10 carbon atoms, a molecule of this carbohydrate could also contain 10 oxygen, and 20 hydrogen atoms.

Explanation:

Think about the word "carbohydrates." The prefix "carbo-" indicates that there are carbon atoms in this compound. On the other hand, the "-hydrate" part of the name hints that this compound also contains hydrogen and oxygen (the two elements that form water.) That's exactly the case- carbohydrates contain exactly three elements: carbon, hydrogen, and oxygen. That rules out the second and the fourth choice: the molecule can't be a carbohydrate if it contains nitrogen atoms.

In particular, for this molecule to be a carbohydrate, the ratio between the number of H and O atoms in it should be the same as that in water. In a water molecule, there are twice as many H atoms as O atoms. So is the case in a carbohydrate molecule.

Among all four choices, only the third one meets both requirements. The molecular formula of this carbohydrate would be , which is equivalent to . Hence the name "carbohydrate."

10 oxygen, 20 hydrogen

Explanation:

A hydrate is a compound that contains the elements of water  in a ratio of 2H:1O.

The only option that fits is 10 oxygen, 20 hydrogen.

The other options are wrong, because the hydrate portion of a molecule does not contain nitrogen.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6