Science grade 5 Activity book

first one grade five this is the summary video for today lesson unit three and four lesson three point four until four point six from your activity with pain number twenty six and until third year all the exercises we solved so let's start exercise 3.4 investigating evaporation from our solution we wanted to find out if you can get salt back from our dash by dash from the from solution by evaporation but what's the method we dash some salt we dissolve some water as salt and water to make salt solution and left it in the warm place for few minutes free few days we want to get back salt from the water so what's the result after some days after few days there was salt in the bottle of the in the bottom of the of container of the container there was no water it had evaporated it has evaporated from the border or from the container what's the conclusion we found that we can get salt back from the solution from the solution by which method by evaporating the water 3.5 what liquid was on the inside of the lid there is water in the lid where did the liquid come from there is above the picture is given where did the liquid come from the liquid come from sugar solution name the process that met the liquid from on the inside of the lid it is condensation it is called condensation explain how this process made the liquid form how it's the process the process like this particles of water vapor or you're saying gas and the jar cool down when they touch the inside of the lid and they change to liquid water this is all the condensation process in which gas change into water question five which process is the reverse question five which process is reverse of the process you named in three the condensation reverse what evaporation okay would the drop of liquid have formed without the reverse process say why or why not obviously no it's not possible evaporation made water vapor from inside yard so the drop of liquid forms when water vapor cools and condenses will the liquid on the inside of the lid taste sweet say why or why not so the liquid is in the lid will not taste it will not taste sweet whenever evaporation take place only the water particles leaves the solution only what what if water particles leave the solution to become water vapor so the sugar will go the sugar is steady and stay down okay and at the at the bottom so only water coming out and the process of and the process of evaporation excess 3.6 the water cycle we just filmed the blank from this world water on earth's surface is what water is on the on the earth surface is heated and dash into the air and evaporate into the air as water vapor from the earth's surface heated and evaporate and and turn or move into the air as water pepper after this the air this is done the air dash as it dries cool the air cools as it dries obviously when the shape of gas when it's evaporation going up it's cooled down some of the water vapor in the air condenses obviously drop off water water and the air form cloud drops of water and the air forms low this happening weird in the air so after forming cloud what happened the drops of water falls from clouds as rain or you can also say as liquid liquid water return to the earth this way so like this this is the water cycle completed 3.7 exercise you will think about what happened when liquid boil you can see here this is after boiling okay look at the picture of beaker in the in the classroom so after boiling what happened you can see the bubbles so which one or this on the stove and and this one here okay which drawing show boiling obviously drawing what process does the other drawing show evaporation you can see evaporation this is the operation okay write down one thing that is the same about the two process what is the time in both process liquid change into water into gas simple or liquid water changes into water vapor gas write down one thing that is different obviously there is one thing different boiling happen when water is heated 200 degree centigrade write down one thing that is different about the two process boiling water when water is heated up to 100 centigrade because one of them we put on the store predict what you think the temperature will be the normal which is this is 20 to 40 okay so you can see evaporation you back here it's boiling so this should be 100 degree centigrade exercise melting in the exercise you will think about what happening okay draw what happened to the eyes in the boxes below so you can make it after two minutes and after 10 minutes it's changing to water completely now this is the cube now it's starting to change okay what has happened to the eyes so it's melted so we write it melted why did the this process happen because of heat the it's not because the eyes first heated at what temperature does this process happen zero degree centigrade as usual degree centigrade ice start melting what do we call this temperature melting point obviously predict the temperature in the saucer after 10 minutes after 10 minutes above 0 degree because after some time it's starting to increase their temperature but first for five minutes it stay on zero when it start melting excise three point nine we need to match line fahrenheit with my earring boiling point at 212 what about celsius celsius 100 boiling point and kelvin kelvin boiling point of water 373 degree okay what is the melting point of ice on each temperature scale for fahrenheit the melting point 32 and celsius melting point zero degree and kelvin melting point 270 through the melting point okay make the following temperature on the on the thermometer so let's make it 37 you can see here this is 40 little bit down this 37 60 here and 100 here what temperature scale does the temperature use we are using which scale this is starting from this is zero okay yeah this boiling point hundred so we can say this is celsius the celsius scale okay after this language review from activity book well in the missing word this is ice this is water so ice has changed into water it is called melting and then changing to gas it's called evaporation and what about when gas change into water and water changing to ice this is freezing water changing to ice freezing and this is condensation done boys question number two complete these sentences if you dash water to the temperature of 100 boil if you if so if you heat water to the 100 degree it start it reach each boiling point its reach reaches its boiling point if you heat at 100 degree so if you dash ice if you cool ice the temperature of zero it reach it freezing point if you are making cool down so it starts reaches its freezing point liquid was formed dash when it is boiled liquid water forms steam when it starts boiling and ice form dash when it it's melt ice forms water ice change into water when it is heat up or start melting exercise 4.1 light travel from source yeah identify the source of light obviously there is sun you can write your son draw line the arrow to show the how cyborg and see the tree obviously you can see and this is source of light on the car or on the tree as you can see you can make it and then from here in the eyes of the guy so like this you can see the tree or something and in front of him okay sophia is looking at book identify the source of light lamp greater lamp and the draw line with arrow to show how sophia yeah sees the book easily from the light source on the book on the book reflected into her eyes exercise 4.2 light from sources and right reflected so we need to first of all make light sources and light reflected look here it's reflect like this from two it is reflect like this this is your eyes and its like like this this is your right or lights are from here and they say so three and four also like this you can see from here and here this is from here and here should be the angle equal both side okay 4.3 in this exercise you will solve the problem using what you have learned about mirror okay you can see here ben is sitting under the table his friend his friend put here again on the top of the table near to edge so how he can see this so what what has been needed to in order to see what is on top of the table without moving out from under the table so what he can use he use mirror he can use mirror he uses mirror to con source to watching or to see this and this one this can draw label diagram to show how when yeah here this one you can see this is the van eyes this is the mirror so with the use of this mirror you can see the cane and this is the light source light source on the object and then it's reflect to the mirror and then from mirror to the eyes like this you can see excise four 4.0 which surfaces reflect light the best copper aluminium bros and tin so we solve the exercise how can we demonstrate and yeah which metal reflect light the best okay we could look at her reflection in each piece of metal and rate them according to which one gave the best reflection okay they are using all of them and then find which one is best okay identified two way in which my bio can make the demonstration fair test obviously she should and she could make sure that how because each piece of metal was the same size clean and then each piece of metal was polished the same amount okay what conclusion do you think the girls will come to after they have finished the demonstration their activity the girls would come to the conclusion what is the result that some metal reflect light better than other some metals reflect lights better than other okay guys next in this 4.5 from activity book diagram one to six your light reflection of mirror yeah you can see this is wrong it's not good other good number three number four number five good number six one and six wrong it's not direction properly angle is not same so let's start the question which angles should periscope which angle diagram two you can see here diagram two this is using periscope you can see in the periscope we are putting like this mirror so you can see if you are looking from here so you can see the object if it is above the head so number drawing two shows shows periscope which two diagrams are incorrect number one and number six both are incorrect re draw the stick diagram okay you can see now now it's good because the angle will be same language review lesson for unit four light sources okay we need to done this we have number one light source number two beans array number three angle number four mirror number five eyes and number six others all think here smooth surface mirror with smooth surface that reflect light and do and doesn't observe like thank you guys take care goodbye