Question

quiz 4
question 1 what is the name of co+2?
question 2 what is the symbol for chlorine gas?
question 3 what is the chemical formula for lead (iv) sulfide?
question 4 what is the name of fei2?
question 5 what is the chemical formula for ammonium sulfate?
question 6 what is the name of mg(oh)2?
question 7 what is the chemical formula for octaxenon tetrafluoride?
question 8 what is the name of p7o5?

Explanation:

Step1: Identify ion name

$Co^{+2}$ is a cobalt ion with a +2 charge, named cobalt(II) ion.

Step2: Determine chlorine gas symbol

Chlorine exists as a di - atomic gas, symbol is $Cl_2$.

Step3: Write lead(IV) sulfide formula

Lead(IV) has a charge of +4 ($Pb^{4 + }$) and sulfide has a charge of - 2 ($S^{2-}$). Using the criss - cross method, the formula is $PbS_2$.

Step4: Name $FeI_2$

$Fe$ can have multiple oxidation states. In $FeI_2$, iodine has a - 1 charge. Since there are two iodide ions, iron has a +2 charge. It is named iron(II) iodide.

Step5: Write ammonium sulfate formula

Ammonium ion is $NH_4^+$ and sulfate ion is $SO_4^{2 - }$. Using the criss - cross method, the formula is $(NH_4)_2SO_4$.

Step6: Name $Mg(OH)_2$

$Mg$ is magnesium, $OH^-$ is hydroxide. The compound is named magnesium hydroxide.

Step7: Write octaxenon tetrafluoride formula

Xenon is $Xe$ and fluorine is $F$. The prefixes indicate 8 xenon atoms and 4 fluorine atoms, so the formula is $Xe_8F_4$.

Step8: Name $P_7O_5$

It is named heptaphosphorus pentoxide.

Answer:

Question 1: Cobalt(II) ion
Question 2: $Cl_2$
Question 3: $PbS_2$
Question 4: Iron(II) iodide
Question 5: $(NH_4)_2SO_4$
Question 6: Magnesium hydroxide
Question 7: $Xe_8F_4$
Question 8: Heptaphosphorus pentoxide