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

step 1 talking about pure substances versus mixtures. And here we have four different examples. And we

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

Key Concepts

Homogeneous Mixture

A homogeneous mixture, often referred to as a solution, has a uniform composition throughout. The different components are so thoroughly mixed that they are not visibly distinguishable, and any small sample taken from the mixture will have the same proportion of substances as the overall mixture.

Heterogeneous Mixture

A heterogeneous mixture is one in which the components are not uniformly distributed, resulting in visible differences in composition. The distinct parts or phases can often be observed or separated, meaning that various sections of the mixture may exhibit different properties or compositions.

Pure Substance

A pure substance is a material with a constant composition that has uniform properties throughout. It can either be an element or a compound, and its chemical makeup does not vary from sample to sample, meaning all its molecules or atoms are identical in composition and properties.

Mixture

A mixture is a combination of two or more substances where each substance retains its own chemical identity and properties. In mixtures, the components can be physically separated and the overall composition can vary, depending on the proportions of the individual substances involved.

Transcript

00:01 Talking about pure substances versus mixtures.

00:03 And here we have four different examples.

00:06 And we want to classify these as pure substances or mixtures.

00:10 And if they're mixtures, we want to classify them as either a homogenous mixture or a heterogeneous mixture.

00:16 So let's go ahead and start with the first one here.

00:18 We have a glass of milk.

00:20 And, well, a glass of milk, if you want to think about it being a pure substance or a mixture, it's actually going to be a mixture because milk, it's, not it's not pure we do have a mix of fat and proteins and water as well so there is not just one single thing that is found or present in milk so it is a mixture and it's actually going to be homogenous mixture simple because if you look at the milk here we have an example of a glass of milk it is it does have fixed proportions throughout it does appear homogeneous there is no different proportion either at the bottom or the middle or the or the or the top and so because it is fixed throughout it is going to be homogenous mixture.

01:03 The next example is beer.

01:05 So here beer, it kind of like milk.

01:08 It is not a pure substance.

01:10 We do have components, different components in beer that it doesn't classify it as a pure substance.

01:18 We don't have just single one thing.

01:20 But it's unlike milk, it's actually going to be a heterogeneous mixture.

01:24 Because as you see, the top part where there is foam, the components are not uniformly distributed.

01:29 We have foam at the top...