When urea dissolves in water, the beaker becomes cold. which statement describes this process? a) the δhsolvation is endothemic but the overall δhsolution is exothermic. b) the δhsolvation is exothermic and the overall δhsolution is exothermic. c) the δhsolvation is exothermic but the overall δhsolution is endothermic. d) the δhsolvation is endothermic and the overall δhsolution is endothemic.

The answer is; D

Solvation is the process by which the molecules of a solute interact with those of a solvent to form solvates. The interaction involves the formation of temporary bonds between the molecules of the elements. These bonds in this rection absorb energy from the atmosphere hence the reaction feels cold to the touch. This is called an endothermic reaction.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

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