Question

question 1 (2 points)
what is the formula for aluminum nitride?
aln₃
al₃n
aln
al₂n₃
al₃n₂
question 2 (2 points)
what is the name for nicl₂?
nickel chloride
nickel dichloride
nickel (ii) chloride
nickel (i) chloride

Explanation:

Question 1

To determine the formula for aluminum nitride, we analyze the oxidation states. Aluminum (Al) typically has an oxidation state of +3, and nitrogen (N) in nitride form has an oxidation state of -3. For a neutral compound, the charges must balance. So, one Al³⁺ ion and one N³⁻ ion combine to form AlN (since \(+3 + (-3) = 0\)).

For \( \text{NiCl}_2 \), nickel (Ni) can have multiple oxidation states. The chloride ion (\( \text{Cl}^- \)) has a -1 charge, and there are two chloride ions, so the total negative charge is -2. Thus, nickel must have a +2 oxidation state. To name the compound with a metal having variable oxidation states, we use a Roman numeral to indicate the oxidation state. So it is nickel (II) chloride.

Answer:

C. AlN

Question 2