00:01
So in this video we're going to talk about question 34 from chapter 20, which says elemental boron is produced by reduction of boron oxide with magnesium to give boron and magnesium oxide.
00:13
Write a balanced equation for this reaction.
00:16
So our reactions are boron oxide and magnesium.
00:21
So let's start out by writing those out.
00:23
So first we need to figure out what the formula is for boron oxide.
00:28
So we know that oxygen, um, tends to react to gain two electrons in order to have the more stable noble gas configuration.
00:38
So when it's acting as the an ion in an ionic compound like this, it's going to take a minus two charge.
00:45
And boron has three valence electrons, three valence s and p electrons.
00:52
So it tends to react to lose those three electrons in order to have the more stable noble gas configuration.
00:58
So it's going to have a plus three charge.
01:00
So our cat ion has a plus three charge and our anion has a minus two charge.
01:05
The least common multiple of three and two is six.
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So we're going to need three of our minus two charges and we're going to need two of our plus three charges in order to have this electrically neutral.
01:22
So the formula for boron oxide is b2 .03...
