Lesson video

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Hi, everyone.

It's really nice to see you.

I hope that you are well.

I hope you're feeling excited for another science lesson with me, Miss Emms. And I'm really looking forward to this one because we're going to be thinking about what happens when you mix different solids with liquids, and what happens when we mix those two things together.

Okay, let's get started straight away by going to our slideshow.

So in today's lesson, this is our key question.

What happens when I mix a solid and a liquid together? Now, this is lesson four.

Can you show me four fingers? Lesson four.

We've already had lessons one, two and three of this unit.

So make sure that you've had a watch of those videos before you start this lesson, because that learning's really important.

So let's get started.

We are going to start off with some star words.

And this is my favourite part of the lesson because we get to do the action for star words and find out what our most important words are.

After that, we're going to have a look at a couple of recap questions.

And remember, a recap question helps us to think about our previous learning so that we know we're ready to access this learning.

After that, we're going to have a look at what happens when you mix solids and liquids together.

And we're going to look at a little demonstration.

And after that, we're going to learn the key words soluble and insoluble solids.

So we will discover what those two keywords mean later on in the lesson.

And finally, it will be time for your end of lesson quiz to see how much of the lesson you've been able to keep in your brain.

So in this lesson, you're going to need three things.

You're going to need an exercise book or some paper to do your writing, and you're going to need a pencil, and also, you're going to need your brain.

Your brain's already there, so you just need to go and get those other two things so that you're ready for the lesson.

Pause the video now and go and get your exercise book or paper and your pencil.

Off you go.

Wow, that was speedy.

Welcome back.

So let's have a look at our star words.

Are you ready for the action? Star words, star words, star words! Well done.

The first one is solid.


We have already had a look at the meaning of solid in our previous lessons of this unit.

Okay, so solid is something that holds its shape.

It does not take the shape of the container it is in, whereas a liquid, liquid, we know that a liquid flows, it can be poured, and it takes the shape of the container that it is in.

Next one, soluble.

We're going to find out what this means.

I don't want you to worry about it at the moment.

Let's practise saying it.



You probably already guessed that soluble and insoluble have opposite meanings.

And finally, dissolve.


Again, we're going to have a look at the meaning of dissolve later on in the lesson.

So, a quick recap.

I want you to have a think about our previous lesson, lesson three, in which we experimented with making mixtures that created bubbles.

So remember, a mixture is when two or more substances are mixed together, and together they form a mixture.

Firstly, can you tell your screen, what two things did you mix together to create our mixtures in lesson three? Tell your screen, I mixed.

Great, well done! You mixed water and soap.

And we experimented with different kinds of soap and different amounts of soap.

And when you did the experiment, if you did, can you tell your screen, which mixture made the best bubbles? Tell your screen.

Okay, perhaps it was when you were using normal soap.

Perhaps it was when you were using shampoo.

You may have found different things using different kinds of soap.

And you may have found that if you added more of that soap to the mixture, that it produced even bigger and better bubbles.

Okay, let's move on to today's learning.

So, we are going to have a think now about what are called soluble and insoluble solids.

I wonder what you think soluble and insoluble mean? You can tell that these words have opposite meanings.

And we're going to find out that we use these words to describe what happens when you mix a solid with a liquid.

I'm going to show you a demonstration before I tell you the meaning of those words.

And I'm going to see if perhaps you will be able to guess the meaning of the words.

Let's have a look at them again, soluble and insoluble.

Say them one more time.

Soluble and insoluble.


So, I'm going to stop sharing my slides now.

I'm going to go full screen so that you can see my demonstration.

I'm going to explain to you what I've got.

You don't need to do anything now, apart from just watch.

So, I have got two containers filled with warm water.

Okay? Not really hot water, warm water.

And I've got two solids as well.

I have got some rice.

Now, it's brown rice because I thought that would mean you'd be able to see it better, but it's rice.

And I have got some salt.

Let me recap quickly what I'm using.

So I've got water, two cups of warm water, and I've got rice and I have got salt.

And what I'm going to do is I'm going to show you what happens when I put in one teaspoon full of rice into one container of my warm water and stir, and what happens when I do the same with one teaspoon of my salt.

You're going to observe, that means watch closely.

And you're going to see what happens.

Okay, let's get started.

So here's my, one cup of my water.

And I'm going to take one teaspoon of the rice.

In it goes.

Okay, you can see straight away that it's gone straight to the bottom.

I wonder if I stir it, is it going to stay there or is it going to dissolve, to disappear in the water? I'm going to stir it a little bit more.

Maybe it will change.


What can you see what has or has not happened to the rice? Tell your screen, I can see that the rice.

You can see that the rice is still there.

Now, I've got water and I've got rice at the bottom.

Okay, let's have a look at what happens when I do the same thing, but with my salt.

I'm going to get a teaspoon full of salt.

And I am going to pour it into my water.

Now, first it goes to the bottom and you can see it there at the bottom.

Let's see what happens if I stir the salt.

I'm going to keep stirring my salt.


And what you can see is starting to happen, it's taking a little while because the pieces of salt were quite big at the beginning, but can you see that the salt is almost disappearing? Soon, you won't be able to see it at all.

And there we go, a little bit more of a stir.

And now you can see that the salt has disappeared.

Or what we're going to learn is dissolved into the water.

Okay? So, I've got my water that has the rice in and my water where I did put salt into it, but the salt has dissolved into the water.

Now, one of these solids, rice or salt, is what we call soluble and one of them is insoluble.

Can you guess which one is which based on what you've seen? Can you guess which solid is soluble and which solid is insoluble? Can you point on your screen to the one that you think is soluble? And point to the one that you think is insoluble.

The salt is soluble.

That means it was able to dissolve.

And that's what happened when it looked like it was disappearing, dissolve into the water.

So the salt is soluble.

The salt is? Fantastic.

The rice, on the other hand, did not dissolve into the water.

The rice is what we call insoluble.

Your turn.


So the salt was soluble.

The rice was insoluble.

Soluble, insoluble.

Your turn.

Fantastic! Well done.

Okay, let's go back to our slideshow.

So, I've had a go at doing a demonstration.

What did you notice? You're going to tell your screen now, what did you notice when Miss Emms poured the salt into the warm water? I noticed that.

Tell your screen.

Great! You may have said, I noticed that the salt disappeared into the water, or it dissolved into the water.

It's not really disappearing.

It's still there, but it's become, it's dissolved into the water.

So you can't see it anymore.

Okay? What did you notice when the rice was poured into the water? Tell your screen.

I noticed that the rice.

Great! You noticed that the rice did not dissolve or disappear into the water.

It stayed there and it sank to the bottom of the glass.

So to recap, soluble, your turn, means that something can dissolve.

It means something can, in water.

It disappears in the water.

Insoluble means that something cannot dissolve in water.

It's still there after stirring.

Okay? And remember, if something is soluble, it hasn't really disappeared.

It's still there but it's become part of the water.

Okay? It's dissolved into the water.

It looks like it has disappeared.

We actually call this a solution.

So when the soluble solid dissolves into the water, it creates what we call a solution.

But for the moment, we can say that we think it looks like it's disappeared.

So, before you start having a go at doing this by yourself, a couple of things that we need to go over.

I used water from the hot tap, but I did not use water, boiling water from the kettle.

So if you're going to do it, you can use water from the hot tap, but don't use boiling water from the kettle.

And you must ask your parents or carer for permission to use water from the hot tap.

The water does not have to be really hot.

It can just be warm.

Ask your parents or carer to help you.

And you can use water at room temperature, so not from the hot tap if you'd like to, but it will take longer for your soluble salt to dissolve.

Okay? You're going to need salt, rice, warm water or room temperature water, either way, and a spoon.

Remember, if you want it to take less time to dissolve, then your water will be from the warm tap.

Can you pause the video now and go and get those four things? Off you go.

Great! Well done everyone.

So now it's your turn.

Make sure you're being safe.

Make sure that you've asked permission.

Make sure you've got your two containers, each with your warm water in, and have a go if you can do what I did.

Have a go, check that I'm right by mixing a little bit of salt into one container of warm water, and a little bit of rice into another container of warm water.

And see if you also find out that the salt is soluble and the rice is insoluble.

Off you go.

Have fun! Fantastic! Well done.

So we're going to write a conclusion now, and it's really important when you're a scientist, just like you are, that you write a conclusion that sort of brings together your findings, okay? That summarises what you, as a scientist found, when you were doing your experiment.

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

You're going to use soluble, insoluble and dissolve.

Can you say those key words? Soluble, insoluble, dissolve.


And then you're going to write a paragraph, and I've helped you out a bit here.

You're going to write, I noticed that the salt, finish the sentence.

This means that the salt is, then soluble or insoluble.

I noticed that the rice.

What happened to the rice? This means that the rice is soluble or insoluble.

So dissolve, you're going to be using dissolve in each of these two ends of sentences.

Okay? Pause the video now so that you can see the example on your screen, and write up your conclusion.

Off you go.

Great, well done.

So, you should, oh, it's not time for the end of lesson quiz quite yet.

Let's go through what you should have had for your conclusion.

You should have said, I noticed that the salt dissolved in the water.

This means that the salt is soluble.

I noticed that the rice did not dissolve in the water.

This means that the rice is insoluble.

Pause the video if you need to tick or fix your conclusion.

Great, well done.

And next, it's going to be time for your end of lesson quiz to see what you have been able to remember from today's learning.

I'm really, really proud of all of your hard work.

You are such a good scientist and you should feel really proud of yourself.

Let's give ourselves a rainbow clap.

So I'll show you how it goes.

It goes like this.

Your turn.

And that means that you've done an amazing job.

I will see you next time for another science lesson with me.

Bye everyone!.