Which yield comes from measurements obtained during a real experiment? A) actual yield
B) theoretical yield
C) percent yield

A) actual yield

Explanation:

 Actual yield is the amount of product that is actually produced in a chemical reaction.

Theoretical yield is the amount of product expected based on stoichiometry.

Per cent yield is the actual yield over the theoretical yield.

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