Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether

step 1 We have four different types of examples of a series of things. We have air. We have chocolates

Classify each of the following as a pure substance or a...

Key Concepts

Pure Substance

A pure substance is a form of matter that has a uniform and definite composition. This means that every sample of the substance has the same properties and the chemical composition does not vary from one sample to another. Pure substances can be elements or compounds, and they cannot be separated into simpler substances by physical means because they are composed of only one type of particle or molecule.

Mixture

A mixture consists of two or more substances physically combined, where each retains its own chemical identity and properties. Mixtures can vary widely in composition, and the components can be present in different proportions. Unlike pure substances, mixtures can be separated into their individual components by physical means such as filtration or distillation.

Homogeneous Mixture

A homogeneous mixture has a uniform composition and appearance throughout. In these mixtures, the distribution of the components is consistent, so that it is impossible to distinguish one part from another with the naked eye. Homogeneous mixtures are also referred to as solutions, where the individual substances are mixed at the molecular level.

Heterogeneous Mixture

A heterogeneous mixture is characterized by a non-uniform composition, where the different components are visibly distinguishable. The individual substances in a heterogeneous mixture are not evenly distributed, and different samples from the mixture can have different compositions. These mixtures can often be separated by physical means based on their distinct phases or components.

Transcript

00:01 We have four different types of examples of a series of things.

00:04 We have air.

00:06 We have chocolates almonds.

00:08 There we have aluminum and we have iodine tincture.

00:12 And what we want to do is pretty much classify each of these four things as pure substance or a mixture.

00:20 I mean, if it is a mixture, if it's a homogenous or a heterogeneous mixture.

00:25 And so first off, we want to go ahead and kind of differentiate between pure substance.

00:30 In a mixture.

00:30 A mixture is something that contains two or more different things.

00:34 Whereas a pure substance, it's only contains that particular thing.

00:38 So that can be a little bit vague, but the idea is very general.

00:44 But when we do have a mixture, when there are different things present, they can be homogenous or heterogeneous.

00:52 So when you have, for example, a homogeneous fixture is where, though you have different things that are present within the same substance that you're looking at, they are in fixed proportions.

01:03 So they're never really going to change.

01:05 It may change a little bit, but like very, very little, but they're going to be very fixed proportions, no matter if you take a sample from one place or another or from one thing or another.

01:17 Whereas if you have a heterogeneous mixture, those things are going to change depending on, i don't know, if it's like, for example, a caposta, and if they contain, depending on the type of seasoning, for example, it could be from one manufacturer, it can be a little bit different.

01:37 They contain one mixture of a certain seasoning, and then another manufacturer can have a different amount of that seasoning.

01:45 So this is just an example, but that would be an example heterogeneous mixture, because the proportions are not the same all throughout wherever you may look.

01:55 So if we want to go ahead and just pretty much classify all of these, for examples, as a mixture or a pure substance, well, we can start with air.

02:01 And air, i can go ahead and just go ahead and type it up at the bottom here.

02:06 Air is actually going to be a mixture.

02:09 It's not going to be a pure substance because our air is made up of different types of gases.

02:16 We have nitrogen, oxygen, carbon dioxide, and things like that, of that sort.

02:22 So it is a mixture, and it's actually going to be harmonized.

02:26 It's going to be a fixed proportion.

02:29 So we can have about 70 % nitrogen, 20 % oxygen or so, and a little bit of traces of other different types of gases that are found within air...

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