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[Music] hi there on the previous module if you have ducked a bad homogeneous mixtures and this time we will be learning what a heterogeneous mixture is are you ready let's begin look at the sample mixtures here try to define what is a true genius mixture look closely on each examples at the first example we have a mixture of water and ice on the second example we have a mixture of milk and in the last example we have a mixture of oil and water now from these examples what do you think is easier genius mixture heterogeneous mixture is a non uniform mixture its appearance is not the same the substances present in the mixture can be identified easily let's study each examples what is the first example what substances can we see in this one that's right there is water and there is also ice as you can see we were able to name the substances present easily why that's because we can see them clearly in the mixture being able to identify or see clearly the substances present in a mixture is a characteristic of a heterogeneous mixture the weather and ice sample is a kind of heterogeneous mixture known as suspension what is a suspension a suspension is a mixture of a solid and a liquid substance for the solid residue settles at the bottom after left alone for some time what happens to the ice cubes when you put them in the water besides the fact that the ice cubes will melt they will also settle in the bottom the same thing happens when you put soil in water we have known that mixtures with substances that settle at the bottom are suspension like the examples that we have here how about those substances leptin it settle at the bottom but floats examples of these mixtures are milk and oil with water sample so what do you call these kinds of easier genius mixtures colloid colloid has substances that do not sell at the bottom but floats even after left for some time most of the colloids look like homogeneous mixture but are really not let the milk that we have here let's prove that the milk sample is not a homogeneous mixture now what makes milk a collide an odd human genius mixture milk is particles that do not dissolve unlike homogeneous mixtures male particles just float let's try to compare a homogeneous mixture sample and a colloid Fred Hommage example we have in here water with white sugar and for the colloid sample we have milk we will be using a flashlight to demonstrate the differences between them as you can see the water with white sugar samples reflected the light will in the milk sample we can only see its shadow basically the milk sample did not reflect the light the particles in a colloid mixture scatter light giving the mixture it Tyndall effect that's the reason why we cannot see a reflective light like the one in the homogeneous mixture sample let's try to study a type of glory that we often use every day can you guess what it is yes it is oil and water mixture our last example in this sample oil floats in water why because oil is less dense than water colloidal discussed earlier has particles that float and in this case it's the oil and this kind of colloid is what we call us immersion immersion is a mixture of two immiscible substances what are immiscible substances immiscible substances are substances that won't mix with each other like the oil and water as what we have seen earlier it did not mix right so those are immiscible substances but the question is will all and water not be mixed forever immiscible substances can be mixed but with the use of an emulsifying agent or emulsifier what does an emulsifying agent or emulsifier it is a substance used to mix immiscible substances basically we just with another substance to mix the immiscible substances and that substance of the boat is known as emulsifying agent or an emulsifier let's experiment put water in a glass and then pour slowly the oil in the mixture [Music] did the oil and water mix together look at them it's still reacting right is it mixing no it's not nixing they did not mix why what happened to the oil the oil just flows because it's less dense than water that's why it's loads but what do you think will happen if we will add the detergent the detergent is the emulsifying agent or the emulsifier can you so remember what is an emulsifier yes that's right that's the substance that we will put in the immiscible substances so that they can be mixed together let's try to mix them together and find out what will happen all right as you can see it slowly mix same all right we were able to mix oil and water together let's check if a light can pass through in this mixture let's have a flashlight test as you can see we can only see the shadow of this mixture no light is reflected in the paper just like on our previous demos or experiments therefore this is still colloidal right we have just learned that a heater juice mixture has two types suspension and colloidal also learned the difference of colloid and homogeneous mixtures and that Beloit has different kinds but we just only focus to only one kind and that is immersion immiscible substances can be mixed together with the use of an emulsifier or emulsifying agent oh we have learned a lot today we have talked a lot today and I hope you have learned them all I will see you again