Question

day 5 (10/9)

1. write the name for se₃cl₉
2. write the chemical formula for potassium sulfate.
3. write the chemical formula lead (i) phosphate.

Explanation:

Step1: Name $Se_3Cl_9$

It is a covalent compound. Prefixes are used for non - metal compounds. There are 3 selenium atoms and 9 chlorine atoms. The prefix for 3 is "tri -" and for 9 is "nona -". So the name is triselenium nonachloride.

Step2: Write formula for potassium sulfate

Potassium has a charge of $K^+$ and sulfate has a charge of $SO_4^{2 -}$. To balance the charges, we need 2 potassium ions for each sulfate ion. So the formula is $K_2SO_4$.

Step3: Write formula for lead (I) phosphate

Lead (I) has a charge of $Pb^+$ and phosphate has a charge of $PO_4^{3 -}$. To balance the charges, we need 3 lead (I) ions for each phosphate ion. So the formula is $Pb_3PO_4$.

Answer:

1. Triselenium nonachloride
2. $K_2SO_4$
3. $Pb_3PO_4$