# Chemistry

posted by Megan

Are the Carbon atoms full though. I don't know. My teacher was saying something about putting the atoms with dots on a diagonal and she said something about using arrows to indicate the "CC" bonds.
???????????????????????????????????????

I don't understand what you mean by th .. are next to the two C atoms.

Sorry. You are right. I got so carried away trying to space everything properly I didn't count the H atoms. Just remove the two H atoms and the 4 dots on the bottom. I'll redraw it it necessary.

my teacher said the same

There should only be 4 hydrogens in C2H4

Usually a BAR (as in -) is used to show a bond and a bar can be replaced with two .. for two electrons for the electron dot structure.
H    H
|    |
H-C=C-H

This is the "stick" model in which the - or | represents the bond between C and C and C and H. To make the electron dot structure, simply replace the | or - with .. or :
In C2H4 there is a double bond between C and C so I drew it as C=C. It can be represented as C::C also.
Are the carbon atoms full, though? yes. We should have a total of how many electrons?
For C2H4 we have
2C = 2 x 4 e each = 8 electrons.
4H = 4 x 1 e each = 4 electrons.
A total of 12 electrons.
Count each - or | as two electrons. You will count 12.

Obviously C2H4 should have been C2H4

Almost. On the bottom, interchange the .. and the H so the H atoms are on the bottom and the .. are next to the two C atoms.

H    H
..    ..
H:C::C:H
H    H
..    ..

See how this looks.

Draw the electron-dot structure and stuctural formulas for:

C2H4 (Dicarbon Tetrahydride)

1. Anonymous

hullo

2. Anonymous

soo silly

## Similar Questions

1. ### Chemistry

Can someone tell me if this makes any sense or if I need to start over. I am not sure if it even answers the question. Why is the benzene molecule represented as “a flat cyclohexane with a ring inside?
2. ### chemistry

calculate number of atoms in 4.67 mol of Ca(NO3)2 I got: 2.81 X 10^24 C atoms or should it be 28.11 x 10^23 C atoms?
3. ### chemistry

how many carbon particles are there in 4.25 mole of C6 H12 O6?
4. ### chemistry help

ok so i need to find how many atoms make up the earth. the average atomic mass of the atoms is 14g/mol. avogadro's number gives the number of atoms in a mole. so what atom do i take?
5. ### Chem- Dr. Bob!

Posted by Rachel on Thursday, January 20, 2011 at 3:57pm. Does anyone know where I can get an image of the valence bond model for maleic acid?
6. ### Chemistry

HCl (aq) + NaOH (aq) -> NaCl (aq) + H2O (l) Will the neutralisation reaction be endothermic or exothermic?
7. ### chemistry

How many atoms of carbon are needed to produce 0.45 mol Al?
8. ### Science

Why do Hydrogen atoms form only single bonds with other atoms and not double or triple bonds like Carbon atoms?
9. ### Chemistry

Why do heteroatoms help determine the physical and chemical properties of a molecule?
10. ### Science

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

More Similar Questions