1
00:00:00,000 --> 00:00:09,000
Hi kids and welcome to our natural science lesson.

2
00:00:09,000 --> 00:00:19,400
Today we are going to learn about pure substances and mixtures.

3
00:00:19,400 --> 00:00:22,480
But do you know what a pure substance is?

4
00:00:22,480 --> 00:00:28,520
A pure substance is made up of a single type of matter, only one type.

5
00:00:28,520 --> 00:00:43,160
We can find many pure substances in our environment, for example oxygen in the air we breathe.

6
00:00:43,160 --> 00:00:58,080
Also water, sugar and salt are pure substances.

7
00:00:58,080 --> 00:01:07,080
They are all pure substances because they are made up only of one single type of matter, only one type.

8
00:01:07,080 --> 00:01:10,080
But what happens when things mix?

9
00:01:10,080 --> 00:01:13,080
Then we've got a mixture.

10
00:01:13,080 --> 00:01:19,080
A mixture is two or more things put together.

11
00:01:19,080 --> 00:01:21,080
Let's make a mixture.

12
00:01:21,080 --> 00:01:25,080
I take lettuce.

13
00:01:25,080 --> 00:01:30,080
I take some tomato.

14
00:01:30,080 --> 00:01:35,080
And I take some tuna.

15
00:01:35,080 --> 00:01:39,080
I mix.

16
00:01:39,080 --> 00:01:41,080
And then I have a mixture.

17
00:01:41,080 --> 00:01:47,080
A salad is a mixture because it has lettuce, tomato, tuna.

18
00:01:47,080 --> 00:01:52,080
It is made up of two or more things.

19
00:01:52,080 --> 00:01:55,080
There are two types of mixtures.

20
00:01:55,080 --> 00:01:59,080
On the one hand we have homogeneous mixtures.

21
00:01:59,080 --> 00:02:04,080
In these mixtures we can't see the different components.

22
00:02:04,080 --> 00:02:06,080
For example seawater.

23
00:02:06,080 --> 00:02:14,080
Seawater is a homogeneous mixture of water, salt and gases like oxygen.

24
00:02:14,080 --> 00:02:23,080
Air is also a homogeneous mixture as it is made up of different gases like oxygen and water vapor.

25
00:02:23,080 --> 00:02:29,080
On the other hand there are heterogeneous mixtures.

26
00:02:29,080 --> 00:02:34,080
In heterogeneous mixtures we can't see the different components.

27
00:02:34,080 --> 00:02:37,080
One example is salad.

28
00:02:37,080 --> 00:02:40,080
In salad we can't see the different components.

29
00:02:40,080 --> 00:02:48,080
We can see lettuce, tomato, chicken, tuna, etc.

30
00:02:48,080 --> 00:02:51,080
So now let's review.

31
00:02:56,080 --> 00:03:01,080
Pure substances are made up of a single type of matter.

32
00:03:01,080 --> 00:03:10,080
For example oxygen, water, salt, sugar and some minerals like diamonds or cards.

33
00:03:10,080 --> 00:03:12,080
Mixers are the opposite.

34
00:03:12,080 --> 00:03:16,080
Mixers are two or more things put together.

35
00:03:16,080 --> 00:03:20,080
And there are two types of mixers.

36
00:03:20,080 --> 00:03:28,080
If we can't see the components they are homogeneous mixtures like seawater or air.

37
00:03:28,080 --> 00:03:35,080
If we can't see the components they are heterogeneous mixtures like a salad.

38
00:03:36,080 --> 00:03:38,080
I hope you like it.

39
00:03:38,080 --> 00:03:40,080
See you!

40
00:03:40,080 --> 00:03:42,080
Lots of kitties!