Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: (𝐚)

step 1 Three pictures here. We have a picture of a leaf, a 999 gold bar, and a picture of stainless ste

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

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Key Concepts

Heterogeneous Mixture

A heterogeneous mixture is a combination of two or more substances that are not uniformly distributed, meaning the different components or phases remain distinct. In these mixtures, the individual substances can often be observed and separated physically, as the composition may vary from one sample to another.

Solution

A solution is a homogeneous mixture where one or more substances (solutes) are uniformly distributed within another substance (the solvent). This uniform distribution occurs at the molecular level, meaning that the components cannot be easily separated or distinguished by visual inspection or simple filtration.

Pure Substance

A pure substance is a material with a constant composition and distinct chemical properties that are uniform throughout the sample. It can be either an element or a compound and does not contain any other substances. This means that any sample of the pure substance will have the same chemical and physical properties regardless of the source or quantity.

Transcript

00:01 Three pictures here.

00:01 We have a picture of a leaf, a 999 gold bar, and a picture of stainless steel.

00:06 We want to classify each of these things as either a pure substance mixture and or a solution.

00:12 We know the pure substances are just made up of one particular type of element.

00:16 There's just one thing, nothing else.

00:19 Mixures, it can made up of one or at least two or more different elements or things and in solutions.

00:25 We can classify them as a homogenous mixture.

00:31 That is composed of two or more substances.

00:35 And they have to be within the same phase as well.

00:38 So that is a solution as well.

00:40 And so if we want to think of a leaf, well, it's not a pure substance because it's not made up of just one thing.

00:47 It's made up of different compounds and whatnot.

00:50 And it's not a solution because, remember, the definition of a solution is that it had to be a homogenous mixture of two or more substances.

00:57 And, well, it's actually going to be a heterogeneous mixture.

01:01 Just because when maybe when the leaf is mixed together with other things like dirt, we are assuming these things because this question is very, in the way it's a vague.

01:11 When you mix leaves, they're kind of arranged in a non -uniform way...

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