Vitamin C is important in the formation collagen, a protein that holds together the connective tissue of skin, muscle, and blood vessels. Vitamin C has the chemical formula C H20. Even if you know
nothing about how the atoms in vitamin C are arranged, what type of bonds are likely to be present in
vitamin C?

Hydrogen bond

explaination: Hydrogen bonding is present because hydrogen from Vitamin C is forcefully attracted to oxygen of carbon dioxide. Dispersion is another present intermolecular force because it occurs between any two adjacent molecules.

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

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.