00:01
So now we'll work on problem 92 from chapter 1.
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In this problem, we're asked to judge whether several statements are true or false.
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If they are false, we should provide a correct version.
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So for part a, our statement is air is, sorry, air and water are both elements.
00:32
So this we know is false.
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So our correct version would be air is a mixture and water is a compound versus both of them being elements.
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So that's part a.
00:57
Now part b, our statement is all mixtures contain at least one element and one compound.
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Now this is false because it doesn't have to contain one of both of them.
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So mixtures can be any combination of elements and compounds or compound.
01:33
Two elements would comprise a mixture.
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Two compounds would provide a mixture.
01:42
So it doesn't, we don't need an element, we don't need a compound, we just need at least two distinct substances.
01:49
So for part c, our statement is compounds cannot, can be decomposed into two or more substances.
01:59
Elements cannot, and that is true.
02:03
Compounds can be decomposed, elements cannot be decomposed.
02:09
For part d, our statement is elements can exist in any of the three states of matter, and that's true.
02:19
The melting and boiling points will vary based on the elements, based on the difference between the elements.
02:25
However, all elements can exist in solid, liquid, or gas form...
