SCIENCE 6 Term 1 Week 5 - Air as Mixture of Oxygen, Carbon Dioxide, Nitrogen & Water Vapor

[00:00:08]Hi and welcome to all our young scientists out there. Welcome to our new episode of your video lesson for science [music] for grade six for term one week five. We are currently now discussing about mixtures and separation techniques, [music] but for this particular episode we're going to focus on air as a mixture of oxygen, carbon dioxide, nitrogen and water vapor.

[00:00:32][music] So welcome to our lesson for week five.

[00:00:37]For our first session, I would like you to watch >> [music] >> and analyze this short clip. Okay, [music] so what do you think is happening in that short clip? What can you see and what can you observe?

[00:00:55]Okay, so what is the short clip all about? So we can see a person [music] okay if it is a woman okay who is covering okay covering her mouth [music] and the background itself is a lot of smoke okay and [music] it is not simple smoke because it's black smoke and we all know what kind of my team on also delicado >> [music] >> it also I think I lose again. Now what concern can you see in the short clip?

[00:01:23]So my kitten nothing now you can begin now I want to learn who know I want to learn more about the photo buildings and [music] a lot of who make me emit non-harmful smoke okay.

[00:01:38]>> [music] >> Now what are the effects of air pollution on us? Okay, so we can safely say based on the short clip now we we are witnessing some kind of a air pollution.

[00:01:49]Okay, now I want to learn more about the effects of air pollution to environment and I lose again.

[00:01:56]>> [music] >> Now so first of all is environment now I want to learn more Why? Because [music] the plants are there our primary source of oxygen.

[00:02:14]Why?

[00:02:14]>> [music] >> carbon dioxide plants to grow [music] air nothing I polluted human being to breathe harmful chemicals >> [music] >> Now how can we keep the air clean?

[00:02:40]Okay. So of course we need to plant more trees. [music] >> [music] [music] >> in terms of air [music] the back Now when we are when we keep [music] planting trees.

[00:03:19]You also nothing no problem the little number factories number one in the >> [music] >> same thing So that but >> [music] >> so can we see the air? Okay, [music] so your teacher will show you a big plastic bag filled with air. Okay, and she would ask [music] you if we can see air. Now, look around us.

[00:04:18]There's some manifestation that air is around [music] us. Okay, for our flow, okay, lesson flow, >> [music] >> what gases make up the air? Air is the mixture of gases that surrounds the earth and is essential for life. Now, the composition of our >> [music] >> air, you know, our air.

[00:04:40]Now, air is mainly made up of nitrogen, about 78%. [music] Though the largest part of air is mostly inactive and helps dilute oxygen.

[00:04:50]>> [music] >> Next is oxygen, about 21%. The gas that humans and animals need for breathing and for survival. [music] So, oxygen, so we don't want to get to the point where we have to buy oxygen to survive in our day-to-day life. That's why we need to take good care of our surroundings, of [music] our nature.

[00:05:04]Next we have carbon dioxide, carbon dioxide, about 0.04%.

[00:05:18]It is used by plants during photosynthesis and produced when living things breathe out. That's why we have the oxygen and carbon dioxide cycle. We need to take good care of our surroundings, of our nature. Next we have carbon dioxide, carbon dioxide, about 0.04%.

[00:05:29]>> [music] >> It is used by plants during photosynthesis and produced when living things breathe out. That's why we have the oxygen and carbon dioxide cycle. We need to take good care of our surroundings, of our nature. Next we have carbon dioxide, carbon dioxide, about 0.04%. It is used by plants during photosynthesis and produced when living things breathe out. That's why we have the oxygen and carbon dioxide cycle. We need to take good care of our surroundings, of our nature. Next we have carbon dioxide, carbon dioxide, here Okay, at the right side of your screen, the composition of air by volume. So, given a pie chart, makikita natin diyan na 78% [music] of air, okay, is made up of nitrogen, 21% [music] made up of oxygen, about 0.04% [music] is carbon dioxide and water vapor. Okay, it varies, so it's a small amount. Okay, so air is called a mixture. Okay, now do you know that? [music] Now, air pala is mixture as well because these gases are not chemically combined.

[00:06:24]Each gas keeps its own properties, and their amounts can change depending on location, weather, and altitude. So, for example, humid air [music] has more water vapor, while dry air has less.

[00:06:37]Okay, your for your assessment, you need we are going to prepare, okay, [music] and we're going to have a demonstration.

[00:06:43]So, this is demonstration number one.

[00:06:46]Okay, you need to crumple a tissue and put it down into the bottom of a glass >> [music] >> so that it does not fall out when you invert the glass.

[00:06:54]Okay, now number two, turn the glass upside down and place it under the water [music] in a bowl. Okay, so see picture, okay? Now, do not tilt the glass.

[00:07:03][music] You should find that the water does not enter the glass and that the tissue stays dry. [music] Okay, so now you can see the picture below.

[00:07:13]All right, so what is happening?

[00:07:14]>> [music] >> Air is taking up space inside the glass.

[00:07:17]So, when the glass is turned upside down under water, the air trapped [music] inside pushes against the water, preventing it from entering. This shows that air is real and it occupies >> [music] >> space. Now, let's try to answer the guide questions.

[00:07:33]What happened to the crumpled paper? So, the crumpled paper stayed dry because the air trapped inside the glass prevented the water from reaching it.

[00:07:41][music] Now, did the water enter the glass? No. The water did not enter the glass because the air inside the glass occupied the [music] space. Now, why did the water not enter the glass? Okay, so be careful not to tip the glass. [music] So, the water did not enter the glass because air takes up space. The trapped air inside upside down glass pushed against the water preventing it from entering. If the glass is tilted, the air can escape as bubbles allowing the water to enter.

[00:08:11]Okay, so [music] we can conclude that air occupies space. Even though we cannot see it, air is um um [music] air is matter because it has mass and takes up space. The trapped air inside the glass kept the tissue dry by blocking the water from entering. So, we have here the key science concept. Air is invisible, but it occupies space.

[00:08:32][music] This simple experiment proves that air is present inside the glass even though it cannot be seen.

[00:08:39]Okay, so for [music] our waste forward, we have our demonstration number two.

[00:08:43]This This activity will show that air is present in the empty bottle and occupies space. [music] Now, you're going to get a plastic bottle around 500 ml.

[00:08:55]water in clear water container or plastic bottle for water [music] dispenser. So, fill the water container with water.

[00:09:02]Okay, fill the clear water containers with water. Number three, tighten the cap of the empty plastic bottle and place [music] it under water. Okay, so you can refer to the picture. Number four, slowly remove the cap >> [music] >> of the plastic bottle under water. So, we can see here, okay, the picture sequence. Water container is filled with water. A cap or cap bottle is placed under water. Cap is slowly removed under water. So, now we can see bubbles come out as the air escapes from the bottle.

[00:09:35]Okay, so conclusion.

[00:09:37]Okay, air is present in the empty bottle. It occupies space. When the cap is opened underwater, the trapped air escapes >> [music] >> as bubbles and water takes its place.

[00:09:46]Now, let's answer, okay, our guide [music] questions.

[00:09:51]So, what did you observe when the teacher opened the empty plastic bottle underwater? So, perhaps when the bottle was opened underwater, air bubbles come [music] out or came out of the bottle and water entered the bottle filling the empty space. Now, why did bubbles come out when the empty plastic bottle was opened? The bubbles came out because air was trapped inside the bottle. When the cap was removed underwater, the trapped air escaped as bubbles allowing the water to enter and takes its place.

[00:10:21]Now, we can conclude that air occupies space [music] and can move. When the bottle was closed, it contained air. Opening it underwater allowed the trapped air to escape as bubbles providing or proving >> [music] >> that air is inside the bottle even though it cannot be seen. So, for our key science concept, [music] air occupies space and is lighter than water. When air escapes from the bottle, water moves in to fill the empty space >> [music] >> left by escaping or left by the escaping air. This demonstrates that air is a real substance that take or takes [music] up space.

[00:10:57]Okay, for session two, this time I would like you to give three importance of [music] air.

[00:11:03]Air sa ating kapaligiran. Okay, so of course Okay.

[00:11:08]>> [music] >> Air, first of all, helps us breathe.

[00:11:12]Kailangan natin ng hangin para tayo mabuhay, specifically oxygen. Okay, it [music] keeps us cool. Walang hangin napakainit.

[00:11:21]At napaka alinsangan. So, we need that as well. Ano pa? Another importance of air? Um Okay, you can also think about that as well. No, ano ba yung pwedeng gawin sa ating ng happening now?

[00:11:36]What is going to happen next?

[00:11:38]>> [music] >> So, perhaps okay, air can also give us energy. You know, wind and it can be turned into electricity or energy.

[00:11:50]So, you know, okay, so for a flow specifically it will what glasses make up the air. [music] All right. Now, for assessment let's have our demonstration number three. So, this activity will show that oxygen in the air [music] is needed for fire to keep burning. So, you need to prepare two candles, light the candle stand on different saucers, label them [music] A and B as what you can see in the picture. Pour some amount of water on saucer or [music] saucer A and saucer B.

[00:12:23]Now, light the candles slowly or light the candles then slowly [music] cover the candles with clear glass.

[00:12:31]Okay. Now, [music] number four, use taller clear glass for saucer A and shorter glass in saucer B. So, you can refer to the picture. Tell the learners to observe the candles covered with clear glass. So, >> [music] >> okay, so picture sequence or observation over time.

[00:12:50]>> [music] >> But then it is must okay. No, I'm going to wait inside the classroom.

[00:12:57]Of course, with the supervision of your teacher.

[00:13:00]>> [music] >> Candles. Okay. Now, for the start both candles are burning. After a few seconds the flame of candle B or the shorter glass becomes smaller. [music] Now, after more seconds candle B is extinguished or no, candle A is still burning. Then after a while candle A is extinguished [music] too. No more flame and then smoke is seen. Now, let's answer the following questions. [music] So, what did you observe in the lighted candles after covering them with clear glasses? [music] So, both candles continued to burn for a short time, but their flames gradually became [music] smaller and eventually went out. The candle covered with the shorter glass went out first. Now, which candle [music] extinguished first? It's candle B, which was covered with the shorter glass, extinguished first because it had less air or oxygen inside the glass. What component of the air is responsible for producing fire? So, [music] it's oxygen. So, oxygen is a component of the air that supports burning. Fire needs oxygen to keep [music] burning.

[00:14:06]Okay, so for our conclusion, this activity shows that oxygen is necessary for combustion or burning.

[00:14:14]When a burning candle is covered with a glass, the amount of oxygen inside the glass is limited. As the candle burns, it uses up the oxygen.

[00:14:21]>> [music] >> Once there is not enough oxygen left, the flame goes out. The shorter glass contains [music] less air or the shorter glass contains less air. So, its oxygen is used up more quickly, causing [music] the candle to extinguish first. So, for our key concept, oxygen supports combustion. Fire cannot continue to burn without oxygen. [music] This experiment demonstrates that oxygen is an important component of air that allows flames [music] to keep burning.

[00:14:51]Okay, so now let's have our session three.

[00:14:55]Okay, so you need to answer some following questions based on what you learned about air and its components.

[00:15:01]So, we have here five questions and I would just let you read and answer our questions. [music] Okay, for our session flow or discussion flow still, okay, it's still we're going to focus on Um, the gases that makes up the air.

[00:15:26]For our assessment, okay, it is activity number two, investigating the air. All right.

[00:15:34]Yes, you need to uh watch a video about composition of the air, >> [music] >> and then copy up the activity sheet.

[00:15:42]Okay, so it will be your activity that you're going to Okay, we have here the guide questions.

[00:15:48]Okay, I think it is around [music] seven or eight questions. So, what surrounds us? So, air surrounds us everywhere. Why do we [music] Why do we not know that gases surround us? We do not notice the gases because they are colorless, odorless, [music] and invisible. What are the activities mentioned in the video which can tell that air surrounds us? For example, feeling the wind blow, inflating a balloon, flying a kite, breathing, seeing leaves and flags move because of the wind.

[00:16:15]>> [music] >> Okay, what do you call the thick layer of air that surrounds the earth? So, it's the atmosphere. Is [music] this layer of air important to us and why? Of course, definitely yes. The atmosphere provides the air we breathe, protect us from the sun's harmful rays, helps [music] regulate Earth's temperature, and supports weather and the water cycle. Now, what makes up the air around [music] us? So, air is made up of different gases, mainly nitrogen, about 78%, oxygen, about 21%, carbon dioxide, about 0.04%, and water vapor, which varies.

[00:16:52]Okay, so now describe each gas that makes up the air. So, nitrogen is the largest part of the air. This mostly inactive and helps dilute oxygen. While oxygen needed by humans and animals for breathing and [music] supports burning. Carbon dioxide is used by plants during photosynthesis and released [music] by humans and animals when breathing out. While water being for water vapor, water in gas form that affects humidity, cloud formation, [music] and weather.

[00:17:22]Now, are the components of the air beneficial to us and [music] why? So, yes, each component has an important role. Oxygen helps us breathe, carbon dioxide helps plants make food, nitrogen supports the balance of the atmosphere, and water vapor helps form clouds, rain, and weather. [music] So, together they make life on Earth possible.

[00:17:44]Okay. So, for our waste forward, okay, you need to answer some more questions.

[00:17:49]Same thing, three important questions, and don't worry, I'm helping you out to answer that [music] one.

[00:18:00]Okay. And for our session four, so you need to answer some questions based on the video.

[00:18:07]Okay. Now, which gas makes up the largest [music] percentage of the Earth's atmosphere? So, I think you got five questions here from the video.

[00:18:21]And of course, don't worry. Okay, we got Mhm.

[00:18:37]Okay.

[00:18:39]So, for our session flow, again, this is what is it all about? For assessment, I use >> [music] >> Okay, you have to number it, but what do you call the Earth the thick layer of the air that surrounds the Earth? So, we call the thick layer of air that surrounds the Earth as atmosphere. So, now, is this layer of Earth important to us? Okay. So, [music] yes, because the layer the layer of air is very important to us because it helps us survive.

[00:19:11]Okay. So, what makes up the air around us? We have here nitrogen, oxygen, argon, carbon dioxide, water vapor, and other gases.

[00:19:24]Key points to remember, okay, so nitrogen 78% is the most abundant gas in [music] the atmosphere. Oxygen about 20.9 to 21% is needed for breathing and supports burning. Carbon [music] dioxide 0.03 or 0.04 is needed by plants for photosynthesis, but too much contributes [music] to global warming. And water vapor affects humidity, clouds, and weather. And noble gases such as helium, neon, and argon are inactive gases [music] with many practical uses in daily life.

[00:19:57]Okay, so after or are gases in the air harmful to us? Gases may be harmful to us if used in excess or in small amount. Okay, so we have here the planets [music] and the composition of the atmosphere.

[00:20:12]Okay, so for our race forward, we the complete each sentence by choosing the correct answer from the [music] box and write your answer on the blank.

[00:20:23]So we have a 10 item here.

[00:20:28]And [music] of course you can check your answers if that is correct. [music] And with that, I would like to say thank you so much for being with me and I hope you learned something about air [music] as mixture mixture and important gases that makes up the air. So this is teacher Aiza. Thank you so much and see you again next episode. Thank you and bye-bye.