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Hello boys and girls, welcome to a new Natural Science lesson, Unit 5, Lesson 4, Pure Substances and Mixtures.

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Let's start with pure substances.

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Pure substances are forms of matter with one type of particle.

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But what is a particle?

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A particle is a very small portion of matter.

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For example, diamond, gold, salt.

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Mixtures.

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Mixtures are forms of matter with two or more types of particles.

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Chocolate powder would be a pure substance.

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Milk would be another pure substance.

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If we mix them together, they are a mixture.

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There are two types of mixtures.

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Heterogeneous mixtures and homogeneous mixtures.

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First, heterogeneous mixtures.

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we can see the different particles or pure substances for example fruit salad homogeneous

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mixtures we can't see the different types of particles for example in this fruit juice with

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different fruits pure substance or mixture heterogeneous or homogeneous

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remember that golden sugar are pure substances pizza salad or juice with

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pulp are heterogeneous mixtures and coffee shampoo and juice without pulp

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are homogeneous mixtures. Separating mixtures. Can we separate mixtures? We can

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separate mixtures and there are three methods that we are learning this year.

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sieving or sieve, filtration or evaporating or evaporation. Sieve. We can separate

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different solids by sieving. We can separate solids and liquids by filtration.

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We can separate solids and liquids in a different way by evaporating. What method

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are they using here? Seeth, to separate solids. What method are they using here? Filtration,

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to separate solids and liquids. What method are they using here? Evaporation, to separate

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solids and liquids. What method are they using here? Filtration, to separate solids and liquids.

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What method are they using here? Sieve, to separate solids.

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Remember that we learned a curiosity that takes place in the north of Spain, in País Vasco,

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The thing is that these Salinas are not in the coast, they are in the field, in a valley called Valle de Añana. There we can find Salinas de Añana.

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They've got a salt water natural spring.

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As you can see, they evaporate water and collect salt.

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They are using evaporation to separate solids and liquids.

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What method are they using here?

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cf to separate solid thank you very much for listening see you