Chemistry

Dixon999 SG

Came across a qn like this: what is the chemical formula for uranium (VI) oxide?

(a) UO2

(b) UO3

(d) U2O6

If i'm not wrong the answer should be (b), y can't we accept (d) as the answer?

yiha093 SG

so u arent sure of the answer urself ?

... if me i'll write d. cause b is the emp. formula

Dixon999 SG

2 be frank I wasn't sure cos i googled 4 the answer n concluded (b) should be tne answer. can someone enlighten us??? the oxidation state for uranium is +6 in (b) n (d)

yiha093 SG

2 be frank I wasn't sure cos i googled 4 the answer n concluded (b) should be tne answer. can someone enlighten us??? the oxidation state for uranium is +6 in (b) n (d)

i will still choose D as emp.forum =/= chemical forumla.

Dejomel SG

i will still choose D as emp.forum =/= chemical forumla.

We are not expected to know the actual formula of Uranium (VI) Oxide (it's actually UO3).

They simply want us to understand that

Oxygen = -2

Uranium = +6

Simply chemistry rules of Cations and Anions apply (simplifying the numbers), meaning a simple compound like Uranium (VI) Oxide (consisting of only two elements) at O' Level standard will not have a chemical formula like U10O30 or U30O90, which would be simply stupid.

Choosing U2O6, imho, is being a smart alec, which is never advised especially for examinations.

UltimaOnline SG

Ionic compounds have no molecules, hence the only valid chemical formula is its empirical formula.

So in this case, empircal formula = chemical forumla.

(For covalent compounds, you can have molecular formula, empirical formula, condensed formula, displayed structural formula, etc.)

yiha093 SG

Ionic compounds have no molecules, hence the only valid chemical formula is its empirical formula.

So in this case, empircal formula = chemical forumla.

(For covalent compounds, you can have molecular formula, empirical formula, condensed formula, displayed structural formula, etc.)

icic... kk will take note.