00:01
Our goal for this problem is to understand how specific silicate anions are a component of various minerals, and from there, we're going to be able to draw the shorthand notations of these anions.
00:15
The first mineral we're given is this equation where we have a lithium bound to an aluminum and then a silicate anion.
00:24
And what this mineral essentially is is repeating units of this silicate anion of two silicons bound to six oxygens with a negative four charge.
00:36
And in shorthand notation, this is what it's going to look like.
00:41
This rectangle around these various units represent how we have repeated units of silicate.
00:50
Now on to part b, we're given another mineral.
00:55
And we can see from here that we will have three tetrahedra with three shared corners and six unshared corners.
01:05
And we understand that from the fact that we have this silicate anion.
01:11
We have three silicons bound to nine oxygens.
01:16
And from there, we can understand that our shorthand notation would look like this.
01:21
Notice here we would have three silicons and the six unshared corners and three shared corners.
01:30
And that's how we would understand which silicate anion is the one we're dealing with.
01:38
And now on to part c we're given another mineral...