is potassium sulphide ....?

Question

an ionic or covalent compound and what is the dot and cross (lewis structure) for it, because i've searched through the web and there's only really info on what it's used for. Also The same question for Trichloromethane. I thought it was covalent but i'm not 100% sure.

Thanks

Answer 1

An ionic compound is one that has electrostatic attraction (attraction between positive and negative ions). This usually occurs between metals and non-metals. A covalent compound, simply put, is where electrons are shared, usually between non-metals.

Potassium sulphide is ionic, since K is a metal and S is a non-metal. K has a charge of +1 and S has -2, so for the compund to be neutral, the formula must be K2S.

For diagram please click: http://img.photobucket.com/albums/v628/jing-er/dotandcross.jpg



Yes, trichloromethane is covalent because the carbon, hydrogen and chlorine all share electrons.

For diagram please click: http://img.photobucket.com/albums/v628/jing-er/dotandcross2.jpg

Answer 2

Ionic 2K+S-->K(2)S the (2) means the 2 is sub scripted (small below)

dot and Cross diagram is

like this
hear the is a Carly arrow going from the K to the S connecting dots and the gaps
2 Ko + Sx --> 2[k]{1+} [Sx]{2-} {} round number means have to be superscript (small above)
the x have to be 6 of them in pars to above to the the right and 2 below
the ion of K{1+} has no valence e- so ad no dots for that
but the S{2-} ion has 8 valence e- but there are 6 x as before and where the e- from the 2 K atoms go but dots

remember to put the carges on to get full marks


tetrochloromethan is covalent
so draw its dot and cros diagram like this
H
|
Cl--C--Cl
|
Cl
make shore the Cl's and H are conected to the C
piut the dot and cross es eter side of the line's

and if you want to be realy clever put a superscripted δ (delta) + over the C and a δ- over the Cl's
hope this hellps ;-)

Answer 3

Potassium sulphide, K2S, is ionic because it is made of a metal and a non-metal. Metals, when compounded with non-metals, always lose their valence electrons to the non-metals as they have fewer. This will result in the stable octet structures for both and they exist as K+ and S2- which will then be attracted to each other due to the charges.

Trichloromethane, CHCl3, is covalent as it is a compound of non-metals. They will share the valence electrons to achieve the stable octet structure.

Answer 4

K2S is ionic not covalent. each K gives an electron to the S. It has been used as a insecticide and as polyK2S in electronic manufacture.

CHCl3 is covalent. C is in the middle reaching out in 4 directions sharing a pair of electrons with the H and each Cl. Tetrahedron shape.CHCL3 is used as a solvent in electronic manufacture.

Answer 5

Ionic! K+ = 2,8,8,8 (two of these)
S-- = 2,8,8

Trichloromethane is HCCl3 and covalent

Answer 6

actually, tricholomethane is POLAR covalent...

Answer 7

That's a damned good question, i wish i had the nounce to give you the answer.