1 00:00:03,819 --> 00:00:08,859 Children, today we are going to study about energy, okay? 2 00:00:09,519 --> 00:00:14,240 So first, we are going to listen and read the page 82. 3 00:00:17,210 --> 00:00:20,750 Energy produces all the changes around you. 4 00:00:21,510 --> 00:00:23,949 It is important for everything you do. 5 00:00:25,010 --> 00:00:30,210 Energy has different forms and it can also change from one form to another. 6 00:00:31,390 --> 00:00:32,329 Thermal energy. 7 00:00:32,329 --> 00:00:37,490 Thermal energy is in anything that is hot 8 00:00:37,490 --> 00:00:41,350 The sun produces lots of thermal energy 9 00:00:41,350 --> 00:00:46,490 When you heat up a material, you add thermal energy to it 10 00:00:46,490 --> 00:00:52,049 When you cool down a material, you take away thermal energy from it 11 00:00:52,049 --> 00:00:56,229 As a consequence, a change of state occurs 12 00:00:56,229 --> 00:01:02,570 If the thermal energy in a liquid increases, it becomes a gas 13 00:01:02,570 --> 00:01:06,049 This process is called evaporation 14 00:01:06,049 --> 00:01:12,129 If the thermal energy in a solid increases, it becomes a liquid 15 00:01:12,129 --> 00:01:15,349 This process is called melting 16 00:01:15,349 --> 00:01:21,989 If the thermal energy in a liquid decreases, it becomes a solid 17 00:01:21,989 --> 00:01:25,230 This process is called freezing 18 00:01:25,230 --> 00:01:32,689 Okay, so here you have one type of energy that is thermal energy. 19 00:01:33,709 --> 00:01:36,890 Energia termica produce different temperatures. 20 00:01:38,209 --> 00:01:42,689 So thermal energy is anything that is hot. 21 00:01:43,390 --> 00:01:48,209 For example, the sun produces lots of thermal energy. 22 00:01:48,670 --> 00:01:53,689 The sun gives us hot, so it produces thermal energy. 23 00:01:53,689 --> 00:02:01,250 When you heat up a material, when you heat up the food, for example, like here 24 00:02:01,250 --> 00:02:04,969 You add thermal energy to it 25 00:02:04,969 --> 00:02:07,530 Se añade energía térmica al objeto 26 00:02:07,530 --> 00:02:10,909 But when you cool down a material 27 00:02:10,909 --> 00:02:15,030 Cool down means cuando se baja la temperatura de un material 28 00:02:15,030 --> 00:02:19,469 You take away thermal energy from it 29 00:02:19,469 --> 00:02:21,490 Lo que haces es quitarle temperatura 30 00:02:21,490 --> 00:02:27,050 As a consequence, a change of state occurs. 31 00:02:28,050 --> 00:02:33,669 And we are going to see the three ways to change the state of a material. 32 00:02:35,110 --> 00:02:42,699 If the thermal energy in a liquid increases, it becomes a gas. 33 00:02:42,960 --> 00:02:45,419 This process is called evaporation. 34 00:02:46,199 --> 00:02:50,560 With a liquid becomes a gas, this is evaporation. 35 00:02:50,560 --> 00:03:01,740 Then, when the thermal energy in a solid increases, it becomes a liquid 36 00:03:01,740 --> 00:03:05,039 If we have, for example, butter 37 00:03:05,039 --> 00:03:08,840 And we increase the temperature of butter 38 00:03:08,840 --> 00:03:11,259 The butter is melting 39 00:03:11,259 --> 00:03:13,879 La mantequilla se derrite si la calentamos 40 00:03:13,879 --> 00:03:19,699 And the sun evaporates water 41 00:03:19,699 --> 00:03:22,479 This is the example for evaporation 42 00:03:22,479 --> 00:03:25,139 And finally, freezing 43 00:03:25,139 --> 00:03:31,719 When we have a liquid and we decrease its temperature 44 00:03:31,719 --> 00:03:34,780 It becomes a solid 45 00:03:34,780 --> 00:03:37,500 When we lower the temperature of a liquid 46 00:03:37,500 --> 00:03:40,639 What it does is that it becomes a solid 47 00:03:40,639 --> 00:03:42,599 Because what we do is freeze it 48 00:03:42,599 --> 00:03:43,199 Freezing 49 00:03:43,199 --> 00:03:47,319 Like the ice creams that you have here 50 00:03:47,319 --> 00:03:51,319 I think this is easy. 51 00:03:51,319 --> 00:05:27,439 Ok, now I'm going to explain the activities that you have to do. 52 00:05:27,439 --> 00:05:34,439 The first one is the activity 2 on this page, on page 82. 53 00:05:34,439 --> 00:05:39,439 And this activity says, what are the three changes of state? 54 00:05:39,439 --> 00:05:43,439 So, the three changes of state you have here, what are these? 55 00:05:43,439 --> 00:05:47,439 Evaporation, melting and freezing. 56 00:05:47,439 --> 00:05:56,100 And then, the second question on the activity is, what happens to the thermal energy in each of them? 57 00:05:57,160 --> 00:06:06,319 You go to evaporation, and here I say, if the thermal energy in a liquid increases, it becomes a gas. 58 00:06:06,319 --> 00:06:10,459 So, this is what happens with the thermal energy in evaporation. 59 00:06:10,459 --> 00:06:17,579 Melting. If the thermal energy in a solid increases, it becomes a liquid 60 00:06:17,579 --> 00:06:21,519 So this is what happens with thermal energy in melting 61 00:06:21,519 --> 00:06:28,620 And if the thermal energy in a liquid decreases, it becomes a solid 62 00:06:28,620 --> 00:06:32,300 This is what happens with thermal energy in freezing 63 00:06:32,300 --> 00:06:38,720 So here, on this part, you have the answer for both questions 64 00:06:38,720 --> 00:06:53,509 ok? ok and the second activity and the last one that you are going to do is the 65 00:06:53,509 --> 00:07:06,350 exercise 1 ok yes the exercise 1 on page 88 and in the exercise 1 you have to 66 00:07:06,350 --> 00:07:17,410 complete this summary. So you have matter, here you have to write states 67 00:07:17,410 --> 00:07:27,029 of matter or states only, and here physical changes. In the states of 68 00:07:27,029 --> 00:07:35,290 matter, liquid, solid and gas, physical changes, we have change of shape that we 69 00:07:35,290 --> 00:07:47,050 going to see this after, and changes of state that you have to complete here 70 00:07:47,050 --> 00:07:53,529 the missing one. And that's all, that's all what you have to do about 71 00:07:53,529 --> 00:07:58,750 science. I hope you understand. If you don't understand anything you ask me 72 00:07:58,750 --> 00:08:04,230 please, ok? Bye bye, see you soon, bye!