Draw an electron-dot structure for the following molecules...

Draw an electron-dot structure for the following molecules or ions: (a) Methylamine, $\mathrm{CH}_{5} \mathrm{~N}$ (b) Ethylene, $\mathrm{C}_{2} \mathrm{H}$ (c) Propane, $\mathrm{C}_{3} \mathrm{H}_{8}$ (d) Hydrogen Peroxide, $\mathrm{H}_{2} \mathrm{O}_{2}$ (e) Hydrazine, $\mathrm{N}_{2} \mathrm{H}_{4}$

Transcript

00:02 Hi there.

00:03 In this question, we have several electron dot structures to draw.

00:08 And the electron dot structures show valence electrons and the bonding in each molecule.

00:14 So first we have methylamine.

00:16 And methylamine is more commonly written as ch3 and h2.

00:23 That's the same as ch5n, but it's more commonly written this way so that you can see how things are added together or bonded together.

00:32 So it appears we have the carbon bonded to the nitrogen.

00:39 There are three hydrogens on the carbon and two hydrogens on the nitrogen.

00:47 Okay, so we know hydrogen, or we know carbon is in group 4a of the periodic table.

00:52 So it has four valence electrons.

00:56 Each hydrogen has one valence electron.

01:03 All right, nitrogen has five valence electrons because it's in group 5a.

01:08 So it has one lone pair, and it has three unpaired electrons.

01:16 And i forgot my hydrogen electron there.

01:19 All right.

01:20 So this would be the complete valence structure.

01:24 If we wanted to add up the dots ahead of time, we could look at carbon, which has four, plus the five hydrogens, where each hydrogen has one, plus nitrogen, which has five, four total of 14 valence electrons.

01:40 So in other words, my finished picture should have 14 dots.

01:44 24, 6, 8, 10, 12, 14.

01:47 All right, this is the lewis dot structure for methylomein.

01:55 Next, we have ethylene.

02:03 Ethylene has the formula c2h4.

02:12 Since it ends with e and e, we know it has a double bond.

02:15 And the only place that double bond could be is between the two carbons.

02:22 That means each hydrogen is then going to be single bonded because each carbon still has two unpaired electrons and each hydrogen brings in one electron.

02:37 All right, so this would be our finished structure.

02:40 Each carbon has an octet of eight electrons and each hydrogen has two electrons, which is what hydrogen needs since it's only in the first energy level.

02:52 Okay, next we have propane, which is less.

02:55 Letter c3h8.

03:02 The ane ending on this hydrocarbon tells us that the carbons are all single bonded together.

03:11 So that means a pair of dots...

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