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ASVAB Physical Science 2.4. A substance that consists of two or more things that are physically mixed together is a...what?


Transcript

00:00

[ musical flourish ]

00:03

And here's your Shmoop du jour, brought to you by mix tapes.

00:07

Anyone have a tape recorder we can borrow?

00:09

No?

00:11

A substance that consists of two or more things

00:13

that are physically mixed together is a what?

00:16

And here are potential answers.

00:18

[ mumbles ]

00:21

Okay, so the question might give it away here. After all,

00:24

you can't spell "mixture" without "mix."

00:26

So, yeah, our answer is option B.

00:28

A mixture is when we have two or more different things that are, well,

00:31

mixed together. Salt water is a mixture because, even though the salt

00:35

dissolves in the water and you can't see it anymore,

00:39

the salt molecules are still separate from the water molecules.

00:42

Snack mix is another kind of mixture.

00:44

Even though you can pick out each little pretzel

00:46

and weird sesame-flavored thing out of the mix,

00:49

when they're all mixed together in that bowl, well,

00:52

yeah, that's a mixture. And a real cool party.

00:55

Option A - a compound is when two or more elements

00:58

are bonded together. It's like when hydrogen and oxygen

01:00

bond together to form an entirely new substance,

01:03

water, or H2O. Just like that.

01:06

Water's completely different from hydrogen and oxygen.

01:09

Otherwise, we wouldn't need oxygen tanks

01:12

when we go scuba diving... Aquaman.

01:14

All right, now we've got a couple of other words that look

01:17

pretty similar to each other - solutes and solvents.

01:21

Well, solutes and solvents are part of solutions.

01:24

Solutions are mixtures that have all the components

01:26

equally distributed throughout 'em.

01:28

Think about salt water again.

01:29

When the salt is dissolved in the water, it's mixed

01:32

completely in the water.

01:34

Now, if we dumped pebbles in the water, well, they'd just

01:36

sit at the bottom and we wouldn't have a solution; we'd just have some wet pebbles.

01:40

In solutions, the solute is what is dissolved.

01:44

The solvent is what does the dissolving.

01:47

So in our salt water example, salt is the solute

01:50

and water is the solvent.

01:53

Most of the time, the solvent in any solution is a liquid.

01:55

The solute can be a solid,

01:57

another liquid, or even a gas.

01:59

Carbon dioxide is dissolved in water to make soda fizzy.

02:02

That's why it makes you burp. [ burp ]

02:05

Now we've just got to remember that not all mixes are good mixes.

02:08

Even though we like both chocolate and hummus. [ yuck ]

02:11

[ squirt ]

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