Question

what must the charge be on the copper ion when it exists as an ionic compound with a formula of cus?
4+
3+
1+
2+
question 12
1 pts
what must the charge be for iron in an ionic compound whose formula is fe₃n₂?
1+
3+
2+
4+

Explanation:

Step1: Determine sulfur's charge

In ionic compounds, sulfur (S) usually has a charge of 2-.

Step2: Balance charges in CuS

For the compound CuS to be neutral, if S has a 2 - charge, then copper (Cu) must have a 2+ charge to balance it out.

Step3: Determine nitrogen's charge

In ionic compounds, nitrogen (N) usually has a charge of 3-.

Step4: Balance charges in Fe₃N₂

Let the charge of iron be \(x\). In \(Fe_3N_2\), we have \(3x+2\times(- 3)=0\). Solving for \(x\):
\[

$$\begin{align*} 3x-6&=0\\ 3x&=6\\ x& = 2 \end{align*}$$

\]
So the charge of iron is 2+.

Answer:

Question 1: D. 2+
Question 2: C. 2+