Need Help with Chemistry (1 Viewer)

[HiHaii]

lol a good discussion u guys are having
I mean writing as a compound as in having the brackets in each of the elements
it's hard to illustrate it here but it goes something like:
[O][2Br] then you have the dots around each of the element according to the valency as well as the symbol, such and such

 

[ohexploitable]

lol a good discussion u guys are having
I mean writing as a compound as in having the brackets in each of the elements
it's hard to illustrate it here but it goes something like:
[O][2Br] then you have the dots around each of the element according to the valency as well as the symbol, such and such

You do that for ionic compounds, OBr₂ is a covalent compound.

 

[ohexploitable]

Like NaCl which is ionic:

 

[ohexploitable]

But H₂O is polar covalent:

 

[hscishard]

You do that for ionic compounds, OBr₂ is a covalent compound.

Can be for covalent too though.
You just have to show the bonds(sharing electron bond)

 

[HiHaii]

Can be for covalent too though.
You just have to show the bonds(sharing electron bond)

I thought you can't cause it doesn't work for 'non-metals'
only works for ionic compounds

 

[hscishard]

I thought you were talking about lewis dots. Dunno anything about brackets.

 

[adomad]

you put the brackets with ions... with the diagram above, the charge of the ions should be displayed

 

[FCB]

Aluminium Sulfate: Al₂(SO₄)₃
Lead (IV) Sulfate: Pb(SO₄)₂
Ammonium Carbonate: (NH₄)₂CaCO₃

PBr₅: Phosphorus penta-bromide

Isnt Ammonium Carbonate: (NH₄)₂CO₃

 

[ohexploitable]

Isnt Ammonium Carbonate: (NH₄)₂CO₃

Oh yeah lol.

 

[HiHaii]

It seems like I keep on asking for more help...

1)Some fertilisers are labelled "NPK fertiliser" because they contain the elements nitrogen, phosphorus and potassium. Which of the following pairs of compounds could be used as a "NPK fertiliser"?
A) ammonia and sodium hydrogen phosphate
B) ammonium phosphate and calcium sulfate
C) calcium phosphate and potassium nitrate
D) potassium hydrogen phosphate and calcium sulfate

the answer is C but I'm not sure why...please explain

2) A red powder is placed in a test tube, water is added and the contents are then filtered. A brown solid is left on the filter paper. After evaporating the filtrate, white crystals are left. This analysis suggest:
a) the red powder is a mixture
b) the brown solid is an element
c) the white crystals are a mixture
d) the red powder is a compound

a?

3) Atom X has two electrons in it's outer shell while atom Y has seven. The chemical formula of the compound formed from X and Y would be:
a) X^2Y^6
b) X^2Y
c) X^2Y^2
d) XY^2

4) identify the group in which all of the substances have covalent bonds:
a) diamond, graphite, carbon dioxide, potassium fluoride
b) hydrogen iodide, water, calcium chloride, paraffin wax
c) iodine, ice, zinc sulfide, ethanol
d) ammonia, oxygen, water, methane

 

[x jiim]

It seems like I keep on asking for more help...

1)Some fertilisers are labelled "NPK fertiliser" because they contain the elements nitrogen, phosphorus and potassium. Which of the following pairs of compounds could be used as a "NPK fertiliser"?
A) ammonia and sodium hydrogen phosphate
B) ammonium phosphate and calcium sulfate
C) calcium phosphate and potassium nitrate
D) potassium hydrogen phosphate and calcium sulfate

the answer is C but I'm not sure why...please explain

2) A red powder is placed in a test tube, water is added and the contents are then filtered. A brown solid is left on the filter paper. After evaporating the filtrate, white crystals are left. This analysis suggest:
a) the red powder is a mixture
b) the brown solid is an element
c) the white crystals are a mixture
d) the red powder is a compound

a?

3) Atom X has two electrons in it's outer shell while atom Y has seven. The chemical formula of the compound formed from X and Y would be:
a) X^2Y^6
b) X^2Y
c) X^2Y^2
d) XY^2

4) identify the group in which all of the substances have covalent bonds:
a) diamond, graphite, carbon dioxide, potassium fluoride
b) hydrogen iodide, water, calcium chloride, paraffin wax
c) iodine, ice, zinc sulfide, ethanol
d) ammonia, oxygen, water, methane

1C, because calcium phosphate contains P [phosphate is PO4, charge 3-], and there's K and N in the potassium nitrate [KNO3]
2A, yes.
3D because each X needs to donate 2electons and each Y needs to gain one.
4D, as potassium fluoride, calcium chloride and zinc sulfide are ionic compounds.

 

[ohexploitable]

1c, because calcium phosphate contains p [phosphate is po4, charge 3-], and there's k and n in the potassium nitrate [kno3]
2a, yes.
3d because each x needs to donate 2electons and each y needs to gain one.
4d, as potassium fluoride, calcium chloride and zinc sulfide are ionic compounds.

+1

 

[Pwnage101]

Looks good ^^^.

 

[HiHaii]

please help with this question, i am having trouble knowing how cause it's hard

how do i find the empirical formula of the minerals Boehmite, Gibbsite and Diaspore?
Given that the composition of:
Boehmite is 44.98% Al, 53.34% O, 1.68% H (Density: 3.1, Hardness: 3)
Gibbsite is 34.59% Al, 61.54% O, 3.88% H (Density: 2.4, Hardness: 2.5-3.5)
Diaspore is 44.98% Al, 53.34% O, 1.68% H (Density: 3.3-3.5, Hardness 6.5-7)