Lesson video

Hi everyone, nice to see you.

How are you feeling today? Great, well I am really excited to be teaching you another science lesson.

Now, make sure that you have watched the previous lessons of this unit before you have a go at this video.

So this is lesson five which means you should have completed lessons one, two, three and four before you have a go at this lesson and that's because we covered some really important learning that's going to help you in this lesson.

Okay should we start? So, in today's lesson, we are going to answer the key question how can I separate a mixture? And you are with me.

My name is Miss Emms. So, first things first, we're going to do our star words and then we're going to answer some recap questions.

These questions are important to help us think about our previous learning so that we know we're ready to learn new things.

After that, we're going to look at different ways in which you can separate a mixture and finally, we're going to do a little bit of an investigation and after that, it will be time for your end of lesson quiz.

So, you're going to need a few things in this lesson and I want you to have a think.

I want you to listen carefully so you know what to get ready.

Your exercise book or paper, your pencil, and your brain, your brains in there, you've got that, that's ready.

Go and get your exercise book or paper and your pencil.

Now pause the video.

Fantastic okay, let's begin.

So let's have a look at our star words and remember you have to repeat it after me, you ready? Star words! Star words! Star words! Mixture, mixture, we've had a look at that word before.

A mixture is when two or more substances are mixed together and together they form a mixture.

They form a? So two or more substances.

How many substances? Two or more.

Next star word, separate.

Your turn, do the action, great.

and the next star word is sieving, your turn, sieving, well done.

That's when we separate by using a sieve and we'll look at when we do that later on and the last star word, magnetism, magnetism.

That's a method of separating that we're going to look at later on in the lesson.

So a quick recap now.

I would like you to tell your screen, first you need to have a bit of a think actually.

We're going to have a think about what the words soluble means and what the word insoluble means.

Have a think.

I want you to define these words using the word dissolve, using the word? Right? So can you tell your screen soluble means when something, or soluble means when a solid can? Finish the sentence.

Great, soluble means when a solid can dissolve in a liquid, okay? And remember when we did it with the salt and we dissolved the salt into the water, it looked as if the salt had disappeared but we found out that it hasn't disappeared.

It's formed a solution with the water.

Our next word is insoluble, insoluble.

Tell your screen what does insoluble mean.

Insoluble means? Tell your screen.

Great insoluble means when a solid is not able to dissolve in water.

So just like our rice it was still there after stirring, okay? So the rice was insoluble and the salt was soluble.

Great let's move on.

So, what did you notice when the salt was poured into the water and what did you notice when the rice was poured into the water and stirred? I would like you to pause your screen and say two full sentences.

I noticed that the salt and I noticed that the rice.

Pause the video, tell your screen.

Fantastic, so you should have said something like I noticed that the salt dissolved in the water because it's soluble.

I noticed that the rice did not dissolve into the water because it is insoluble, okay? Great job everyone, great recap.

Okay, let's move on now to thinking about separating mixtures.

Can we do the action one more time, separate, your turn.

Fantastic, what do you know that the word separate means not necessarily in a scientific way, but you may have heard the word separate before.

So can you tell your screen what you think separate means.

I think separate means.

Fantastic, great answer.

So today we're going to have a look at separating mixes.

So you might have said for separate about two things together and if you separate them, you separate those two items in the mixture so that they're no longer a mix.

You have one thing and the other thing and they have separated, okay? So we're going to have a look at separating mixtures here and a mixture as we've learned in our previous lesson is when there are two or more substances that are mixed together.

So for example, let's have a look at the first picture.

In this picture, you can see that there is a mixture with some sort of salad leaves and water and we can separate the two parts of that mixture so the side of these and the water by using a sieve.

Here you can see that we've got some rice and some flour, okay? So if we had a mixture with rice and flour we would be able to separate the rice and the flour by using a sieve.

So again, separating two parts of the mixture.

So here, you can see a picture of a sieve and that's to remind us that one of the methods of separating mixtures is to use a sieve but that's not the only way that we are able to separate mixtures.

We are going to learn about three methods of separating mixtures.

How many methods? Three well done.

So, I'm going to show you a little demonstration now of separation and I want you to watch really carefully.

Okay, so what I've got in front of me, is I've got a mixture and my mixture and you might be able to see the parts here.

You can see some brown part and a white part.

So I got flour and I've also got brown rice.

The rice is brown just so you can see it more clearly but it's rice and flour.

So two solids that are mixed together to form a mixture.

Remember a mixture is when there are two or more substances that are mixed together, okay? And I'm going to separate this mixture.

You're going to have a look and you're going to think about what that means as you see me separate the mixture.

So, here I have got a sieve and you can see, you might have, can you nod your head if you've got a sieve at home in your kitchen.

So a sieve has little holes in and nothing that.

So only things that are smaller than those holes we'll be able to go through, anything bigger than those holes is going to stay inside the sieve.

So let's see what happens when I pour some of my mixture into my sieve.

I'm going to pour in carefully.

I'm going to pour some of my mixture and then what I'm going to do is I'm going to hold up the plate and I'm going to sieve like this.

You might be able to see that its just the flour that is coming through the sieve because the flour is.

The parts are small enough to go through the sieve.

If I keep going, you can see that the rice is staying inside the sieve because the pieces are too big to go through the holes and if I keep going until I'm finished, I have then separated my mixture.

I have flour as one part of my mixture and I have the rice as the other parts of my mixture and now the mixture is separated into its two parts.

Before it was a mixture because those two parts were mixed together.

As you can see here, I've still got a little bit left there, okay? So I've had to go at doing a demonstration and now, I would like us to think about the three ways that we are able to separate mixture and I've only show you one of those ways.

The first way that you are able to separate a mixture is to use your hand to separate a mixture by hand and this is when the size and appearance of parts of the mixture are different.

For example, if you had a collection, a pile of lots of different beads of different colours and I said to you, "I only want the blue beads please." Or "I'm making a bracelet and I only want the yellow beads." You wouldn't be able to use a sieve, okay? Firstly, these beads are too big.

and secondly, they're all the same size.

So I would need to use my hand.

I'd need to look carefully and I would separate by hand if I wanted just the yellow beads, I would pick out the yellow beads by hand and I'm able to do that because the appearance, the appearance of the beads is different, okay? They are all different colours.

I could also use this method.

So using my hand, separation by hand to separate Lego pieces of different sizes, okay? So if I was building something with lots of different Lego pieces and I wanted.

And it's a mixture of pieces of all different sizes, I could use my hand to separate the mixture of Lego pieces because they are different sizes.

So I might say, "Right, I want to start with all the small pieces." I'm going to separate the mixture by choosing just the pieces that are small, okay? You can also use a different method called magnetism, your turn.

And magnetism is used when pieces of metal are mixed with other objects, okay? You might have looked and used magnets before, okay? To attract metal objects.

So I could use magnetism if I'm separating iron filings and we know the iron is a type of metals so small iron filings from sand, I could use a magnet to separate the iron filings from the sand, and finally sieving, by separation by sieving and we had to look at that at the beginning of our lesson and this is when you're separating solids of different sizes, okay? So as I showed you at the beginning of the lesson, I think I said that it was water coming out.

There maybe water too and you can use a sieve when you're trying to separate water from a solid that won't go through the holes.

For example, if you're using.

If you have lettuce that's covered with water, you might put the lettuce and the water into the sieve and shake and the water would come through the holes.

We're thinking about separating solids of different sizes.

For example, when I separated this mixture with rice and flour, two solids different sizes and I was able to separate that mixture, or separating sand from gravel.

So if I had a mixture of sand and gravel and I wanted to separate it, so I wanted the gravel on one part, I wanted the sand elsewhere, then I could use a sieve to separate that mixture.

Can you tell me which parts of the mixture would go through the sieve.

Point to the picture.

Right, the sand well done because the pieces are much smaller and which part would not go through would stay in the sieve? Gravel, because the pieces of gravel are much bigger, well done.

So we're going to play a little bit of game now and you're going to tell me which method you would use.

So you need to think about your learning so far to play a matching up game.

So we've got three ways that you can separate mixtures, say them with me, by hand, magnetism and sieving and we've gone over when you would use each of those ways and I've got three things that I want to think about here.

Separating flour and rice, separating metal from recycling or waste, rubbish and separating stones from sand on the beach, okay? And what I'd like you to do is I would like you to think about which method you would use for each of those.

So which method would you use for separating flour and rice? Which method would you use for separating metal from recycling or waste? And which methods would you use for separating stones from sand on the beach? I would like you now to go through and I'd like you to choose the method that you would use.

So you're going to write one, the method, two the method you use for number two and three, the method that you would use for number three.

Pause the video and off you go.

Fantastic, well done everyone.

Let's see if what you got matched what I had.

So separating flour and rice, I would use as I've done in my example, I would use a sieve because the rice isn't.

The parts of rice are much smaller silly Miss Emms the part, the flour.

The parts of flour are much smaller than the rice.

So they can go through the sieve.

The second one, separating metal from recycling or waste.

Remember we said that when there's metal involved, we use magnetism, we use? Because that will attract the metal.

So number two was magnetism and finally number three, you could of had two things here.

If I was on the beach and I wanted to separate stones from sand, I could use my hands to pick up the stones from the sand.

I could also use a sieve because the sand would go through my sieve and the stones would stay in the sieve, okay? Pause the video now, to tick or fix your answers, off you go.

Fantastic, goodness me, you're doing such a good job I think you deserve a mid lesson high 10.

So that means you're going to give me a high 10 from where you're sitting.

You're going to imagine that we're getting into a high 10, don't knock over your laptop or your phone.

Three, two, one, good job everyone.

You're so doing well.

So now it's going to be your turn to have a go and you don't have to do this investigation because I've already showed you at the beginning but if you'd like to, you're going to need a sieve, some rice and some flour can you pause the video to go and get those things if you're going to have a go at the investigation, off you go.

Amazing, well done, or you can and you can do both if you'd like to, and if you haven't been able to get the previous items, you can get perhaps your learning outside or you've got some outside space.

You could find some sand and some gravel but perhaps it's less likely that you'll have those things.

If you do, you can go and get a mixture of sand and gravel but don't worry if not and again, you would need your sieve, if you were doing that.

Pause the video if you want to get those two things as well.

Great, before you start remember to ask permission from your parents or carer to use the sieve, ask permission from your parents or carer to use flour and rice or sand and gravel and ask your parents or carer to help you prepare these things if you need help.

So if you need to go and ask them now then you can pause the video to do that.

So it's your turn now.

Have fun, good luck.

Remember what you're looking for as you do your investigation into separating mixtures.

off you go, pause the video now.

Great, well done.

Why were you able to separate the two parts of the mixture? Why were you able to do that? I was able to separate the two parts of the mixture because say the sentence starter and finish your answer to your screen.

Off you go.

Amazing, you were able to separate the two parts of the mixture because they were of different sizes.

So one part was able to go through the sieve and the other part was not, and now as all great scientists do and you are a really great scientist.

We're going to write a conclusion.

So you're going to use the following words in your conclusion.

I'd like you to try and use mixture and separate.

Can you say those words? Right, I helped you out here 'cause I was feeling kind and I've written part of your conclusion.

You're going to write a paragraph for your conclusion.

You're going to start with my mixture was made of and so the two things that you used, either flour and rice or sand and gravel.

I used a sieve to the parts of the mixture.

So what did you do? I used to sieve to? You should know the word that goes there.

I was able to separate the, one part of the mixture, from the other part of the mixture.

I was able to do this because? Why were you able to do this? So pause the video now and have a go at completing your conclusion, off you go.

Fantastic, well done.

Let's go over it.

So you should have had, my mixture was made of flour and rice or sand and gravel.

I used a sieve to separate the parts of my mixture.

I was able to separate the, and here you could have had flour from the rice or rice from the flour, or sand from the gravel or gravel from the sand.

I was able to do this because the parts were different sizes and you could have gone on then to say, one part or the flour was able to go through the sieve whereas the rice stayed in the sieve or the sand was able to go through the sieve whereas the gravel stayed in the sieve, something like that, okay? And next it's going to be time for your end of lesson quiz.

You've tried so hard today yet gain, you have impressed me with how amazing a scientist you are, well done and I will see you next time for another science lesson with me Miss Emms. See you next time, bye.