Hello, everybody.

I hope that you're well.

My name is Ms. Panchal and I'm so excited to do today's science lesson with you.

We're going to be reviewing today all about transparent and opaque materials, and those are two really important keywords.

Don't worry if you're not too sure what they mean because we will go over that at the beginning of the lesson.

Now, have you got your thinking caps on? Let's all put them on together.

We've got lots of wonderful learning to do in our lesson today.

So let's get started.

Are you ready? So the outcome for our lesson today is I can name transparent and opaque materials and talk about how they are useful.

So we're going to talk through some keywords now that we're going to use in our lesson.

So we're going to practise saying them.

So my turn, material.

Your turn.

Super job.

My turn, transparent, your turn.

Superstar.

Well done.

My turn, opaque, your turn.

Fantastic job, everyone.

My turn, result, your turn.

Superstar.

Well done.

I'm so impressed with how you've practised saying those words.

Now, some of these words you may have heard of before and some of the words you may not have been so sure.

But don't worry because we're going to talk through all of the words in our lesson today.

So we're going to have two parts of today's lesson.

We are going to use results to help us do our learning and then we're going to be sorting some materials.

Are you ready to start the first part of our lesson? Super job, everyone.

So Andeep and Sofia have been finding out which materials are transparent and opaque.

Do you know what these words mean? Those are two really keywords.

Can you tell your partner what they mean? Excellent.

Well done.

So transparent materials let light through, so this means we can see through them.

And opaque materials do not let light through and we cannot see through them.

So they carried out their own tests to compare different materials.

They held up each material to check if they could see clearly through it.

And this is an example of testing a cardboard tissue box.

They looked to see if they could see clearly through the materials and wrote down their results in a table.

So we cannot see through this metal tin, but we can see clearly through this plastic cup.

So we can see here that the tin is opaque because we cannot see through it.

It does not let light through.

Whereas the thick plastic cup here is transparent because we can see through it because it does let light pass through.

Is this similar or different to what you did? So in your investigation, did you do something similar or did you do something a little bit different? Did you do something similar to another group in your class or did you do something different? But well done for having a go at this investigation.

So here were the results for their tests.

So the materials they used were thick plastic, material tin, food wrap and denim fabric.

So the thick plastic, they said yes, you can see through it clearly, the metal tin, they said no, you cannot see through clearly.

The food wrap was yes, you can see through it clearly.

And the denim fabric was no, you could not see through it clearly.

Now, are they similar or different to the results of your tests? So have a look at your results table.

Was this similar or a little bit different to these results? Maybe you can compare your results with another group's.

Did they get similar ideas or did they get different ones? Super job, everyone, well done.

So the results of their tests can tell us which materials are transparent and opaque.

What would you write in the table? So let's do a quick recap of those words.

So the word transparent means it does let light through.

That means we can see through it.

The word opaque means that it does not let light through and we cannot see through it.

So the material was thick, clear plastic and we can see through it.

So we know that that is transparent.

The metal tin, we could not see through it, therefore it is opaque.

And the food wrap we could see clearly through it, so it's transparent.

And the denim fabric, we could not see clearly through it, so it is opaque.

So let's do a question to check our learning.

Sofia and Andeep test each material.

What do we call the information that they find out? Is it A, the reports, B, the results or C, the rewards? So once they've tested each material, what's the information that they find out? Have a little think.

You may have seen this before in another science lesson or even in another subject.

Well done, everyone.

The answer is B, the results.

So this is the information that we get and we find out from the investigation.

So let's do another quick check of our learning.

So Aisha says, "The results of our investigation show us the equipment we need to use." Jacob says, "The results of our investigation can show us which materials are transparent and opaque." And Sam says, "The results of our investigation show us how to test materials." Who do you agree with, Aisha, Jacob or Sam? Once you think about who you agree with, I want you to have a little think about why.

So pause the video here, read over what the children have said again and talk with your talk partner.

Who do you agree with and why? We'll go through the answer really soon.

Off you go.

Super job, everyone.

Well done.

I could hear your really great discussions there with your talk partners.

So Jacob is actually correct.

The results of an investigation tell us what has happened or what we have found out.

So Aisha said the results of the investigation show the equipment.

Unfortunately, that's not correct and Sam said it shows us how to test the materials.

Unfortunately, that's not correct either.

Well done if you chose Jacob.

So let's move on to the first task of today's lesson.

So look at the results of your own tests.

Complete this table to show which materials are transparent or opaque.

So we did an example of this a little bit earlier on in the lesson.

So if you need to, pause the video here, go back a couple of slides and look at the example again just before you start completing your own results table.

Have a go at this task and we'll talk through some example answers really soon.

Remember the definitions of those two keywords.

Transparent means that light is let through so you can see through it.

And opaque means light is not able to pass through the material so we cannot see through it.

Pause the video here, have a go at this task and we'll talk through some example answers really soon.

Off you go.

Fantastic job, everyone.

Well done.

So your results table may have looked similar to this or may be a little bit different.

So in this example, we had a glass and yes, you could see it through clearly, which means it's transparent.

The thick felt, we could not see through it clearly.

Therefore, it means that material is opaque.

The clear plastic bag, we could see through it clearly, which means it is transparent.

And the bubble wrap, we could see through it clearly, which means it is also transparent.

And the metal tray, we could not see through it clearly, which means it is opaque.

Now, did you get similar results to this or did you get some different ones? Now, well done for having a good go at that task, everyone.

Again, I know it's really important that we remember those two keywords, transparent and opaque.

Well done, everyone.

So we're now going to move on to the next part of our lesson where we're going to be sorting materials.

So we have to use our knowledge of transparent and opaque materials to help us sort different materials.

So how can the results help us to decide which material is best for each job? And Andeep says, "Which transparent material is best for making a window for Teddy's den?" And Sofia says, "Which opaque material is best for making a sleep mask?" So Andeep and Sofia want to sort the materials based on their results.

So sorting their materials here will help them to answer their questions.

Can we help them? Yes, we definitely can.

So in transparent, we've got food wrap, glass and thick, clear plastic.

And in opaque, we have foil and denim fabric.

So remember, the word transparent means that these materials here, light can pass through so we can see through them clearly.

Whereas opaque materials are on materials that light cannot pass through and therefore, we cannot see through them.

Let's do a check of our learning, shall we? When we put materials into groups, which science skill are we using? Are we using A, researching, B, sorting or C, measuring? Have a little think.

Fantastic work, everyone.

Well done.

So let's do a quick hands up.

Hands up for A, researching B, sorting or C, measuring.

Super job, everyone.

Well done.

We are using our skill of sorting to put materials into different groups.

So Andeep can use his results to answer his question.

So Andeep says, "All of these materials are transparent.

Which should I choose to make a window for teddy's den and why?" So we know that in the transparent group, we've got glass, food wrap and thick, clear plastic.

But Andeep is still a little bit unsure as to which material he should use for teddy's window.

So transparent materials have other properties too.

Andeep says, "I have chosen thick, clear plastic because it is transparent and it is also strong and smooth." So we can see there he's inserted the thick, clear plastic and we can see through inside the den, but also, Teddy can see outside the den as well.

So Andeep has chosen to use thick, clear plastic for the window.

Now let's move on to Sofia.

So Sofia can use her results to answer her question.

And Sofia says, "These materials are opaque.

Which should I choose to make a sleep mask and why?" So in her opaque group, we've got foil and denim fabric.

Now remember, we said a sleep mask can put on your eyes just similar to my glasses, but they cover your eyes and help you sleep because it makes it very dark.

So out of foil and denim fabric, which one do you think would be best to make a sleep mask? Do you know? Well done.

So opaque materials have other properties too.

"I have chosen the denim fabric because it is opaque and it is also bendy and a bit soft." So if an eye mask, it needs to be quite gentle on your eyes.

So the foil might be hurting your eyes a little bit.

So denim fabric would definitely be a lot better for the eye mask.

Did you also choose that material to answer Sofia's question? Well done for having a good go, everyone.

So scientists think about how transparent and opaque materials can be useful to us.

For example, a glass light bulb, a wooden fence, plastic sunglasses and fabric hospital curtains.

Now, transparent and opaque materials can be really helpful to us in our everyday lives.

For example, sunglasses, if we couldn't see through those sunglasses, then that wouldn't be very good and we wouldn't be able to see where we are going.

And wooden fences, if we could see straight through them, then we can see what everyone's doing in their garden.

So having the wooden fence as opaque material helps us to have a little bit of privacy in our garden.

Let's do a check of our learning.

Aisha says, "Scientists think about how transparent and opaque materials can be useful to us so they can make waterproof coats." But Alex says, "Scientists think about how transparent and opaque materials can be useful to us so they can choose the right materials for different objects." Who do you agree with? Aisha or Alex? Once you've decided your answer, I would like you to have a think about why.

Off you go.

Fantastic work, everybody.

Well done.

So Alex is correct.

So scientists choose the right materials for making objects like light bulbs, curtains and sunglasses.

So scientists have to think really carefully about which material to use and which would be best, whether it would be a transparent material or an opaque material.

So it's really important that they understand what those keywords mean and we've been working really hard to learn those words but also remember those words too.

So let's move on to the next task for today's lesson.

So I would like you to sort the materials that you tested into transparent and opaque groups.

So use the materials that you tested and you can either print this page or you can draw your own circles.

It's completely up to you.

So sort the materials that you tested and click play when you're ready to continue.

Off you go.

Fantastic job, everyone.

Well done.

So here are some examples and your results might have looked like this or they may have looked slightly different if you used different materials.

So in the transparent group, you may have put bubble wrap and plastic film.

And in the opaque group, you may have put silk, metal and thick wool.

So as I said, it may be a little bit different compared to this based on which materials you tested in your investigation or some of them may have been a little bit similar.

Well done, everyone.

So the next part of this task is I would like you to name a transparent or opaque material that you think would be useful for the objects in the table.

So the different objects we have are sunglasses, a secret diary, a hiding place, and the bottom of a boat for viewing fish.

So the first part of this task, I want you to think about whether an opaque material would be appropriate or a transparent material.

And then I would like you to think about naming a material that you think would be useful.

So pause the video here, either print out this page or you can have a go at drawing the table yourself.

You might want to complete this in partner so you can share your ideas.

Have a go and we'll talk through some example answers really soon.

Off you go, everyone.

Super job, everyone.

Well done.

I'm so impressed that you've worked so well with your partner and actually come up with some really fantastic ideas.

Well done, so let's go through some examples.

So here are some examples.

You may not have had exactly the same materials, but you may have had some similar.

So for the sunglasses, we'd need transparent.

And for example, you could use plastic.

For a secret diary, we'd need that to be opaque and that could be made out of paper.

A gift box would need to be opaque 'cause we wouldn't wanna see what's inside otherwise it won't be a surprise.

And that could be made out of card.

And the bottom of a boat for viewing fish would need to be transparent so that you can actually see all the wonderful fish and that could be made out of glass.

Well done for having a go at completing this task.

It's really important you have to learn about what the object was, having to understand what the word opaque and transparent means, but also using your knowledge of materials and their properties.

So a big well done to everybody.

You've worked so hard.

So we've now come towards the end of today's lesson.

So let's do a summary of our learning.

Transparent materials are completely see-through.

You cannot see through opaque materials.

And the results of an investigation can tell us which materials are transparent and opaque.

Materials can be sorted into transparent and opaque.

And scientists think about how transparent and opaque materials can be useful to us.

So a big well done to everybody.

You've used your knowledge of the word transparent and opaque, but you've also used your knowledge of different materials and their properties.

So I'm so impressed with all your learning today.

Let's give everyone a pat on the back.

Super job, everyone.

Now, I hope you have a great rest of the day and I'm sure I will see you in the next science lesson really soon.

Have a good day, everyone.

Bye-Bye.