Question

what is the formula for zinc hydroxide? what is the formula for carbon dioxide? what is the name of the compound with the formula o2f2? what is the name of the compound with the formula kcn?

Explanation:

Step1: Determine zinc hydroxide formula

Zinc has a +2 charge ($Zn^{2+}$) and hydroxide has a - 1 charge ($OH^{-}$). To balance the charges, we need 2 hydroxide ions for 1 zinc ion.
$Zn(OH)_2$

Step2: Determine carbon dioxide formula

Carbon has a +4 valence in this compound and oxygen has a -2 valence. For charge - balance, we need 2 oxygen atoms for 1 carbon atom.
$CO_2$

Step3: Name the compound with formula $F_2O$

Oxygen is less electronegative than fluorine. In binary - compound naming, the less electronegative element is named first. So it is oxygen difluoride.

Step4: Name the compound with formula $KCN$

$K^+$ is potassium ion and $CN^-$ is cyanide ion. So the name is potassium cyanide.

Answer:

1. $Zn(OH)_2$
2. $CO_2$
3. Oxygen difluoride
4. Potassium cyanide