6. What do the bubbles in boiling water principally c a. air b. O2 (e and H2e c. H20 d. vacuum e. nitrogen What is the correct name for Co3(PO4)4? a. cobalt phosphate b. tricobalt tetraphosphate c. cobalt (II) phosphate d. cobalt (III) phosphate e. cobalt (IV) phosphate 7. 8. How many neutrons are contained in *He? a. 0 b. 1 c. 2 d. 3 e. 4 9. How many electrons are contained in He 2 2 a. d. 3 e. 4
Solution
6) the bubbles in boiling water contains water vapours, hence H2O(g), as the vapour pressur eof li
7) The name for anion is phosphate , there are four phosphate groups
The oxidation state of cobalt is
3x + 4(-3) = 0
x = +4
So the correct name is Cobal(IV)phosphate
8) neutrons = mass number - atomic number = 4-2 = 2
9) Electrons = 0
as the number of electrons in Helium in its ground state = 2
The charge is +2, which represents removal of two electrons
.
6- What do the bubbles in boiling water principally c a- air b- O2 (e.docx
1. 6. What do the bubbles in boiling water principally c a. air b. O2 (e and H2e c. H20 d. vacuum e.
nitrogen What is the correct name for Co3(PO4)4? a. cobalt phosphate b. tricobalt tetraphosphate
c. cobalt (II) phosphate d. cobalt (III) phosphate e. cobalt (IV) phosphate 7. 8. How many
neutrons are contained in *He? a. 0 b. 1 c. 2 d. 3 e. 4 9. How many electrons are contained in He
2 2 a. d. 3 e. 4
Solution
6) the bubbles in boiling water contains water vapours, hence H2O(g), as the vapour pressur eof
li
7) The name for anion is phosphate , there are four phosphate groups
The oxidation state of cobalt is
3x + 4(-3) = 0
x = +4
So the correct name is Cobal(IV)phosphate
8) neutrons = mass number - atomic number = 4-2 = 2
9) Electrons = 0
as the number of electrons in Helium in its ground state = 2
The charge is +2, which represents removal of two electrons
