Suppose a teaspoon of magnesium filings and a teaspoon of...

Name: Problem 78, Chapter 1: Chemistry
Uploaded: 2019-07-21T03:35:40-08:00
Duration: 2 min 12 s
Channel: Matthew Lueckheide
Description: Suppose a teaspoon of magnesium filings and a teaspoon of powdered sulfur are placed together in a metal beaker. Would this constitute a mixture or a pure substance? Suppose the magnesium filings and sulfur are heated so they react with each other, forming magnesium sulfide. Would this still be a "mixture"? Why or why not?

Suppose a teaspoon of magnesium filings and a teaspoon of powdered sulfur are placed together in a metal beaker. Would this constitute a mixture or a pure substance? Suppose the magnesium filings and sulfur are heated so they react with each other, forming magnesium sulfide. Would this still be a "mixture"? Why or why not?

Key Concepts

Mixtures

A mixture is a physical combination of two or more substances that are not chemically bonded. In mixtures, the individual substances maintain their own chemical identities and can typically be separated by physical methods. The properties of a mixture depend on the proportions of its components, and the substances do not react to form new chemical compounds.

Pure Substances

A pure substance has a uniform and definite composition throughout. Pure substances can be elements or compounds that have fixed properties and are composed of one type of particle or a particular arrangement of atoms, which leads to consistent behavior and characteristics.

Chemical Reactions

Chemical reactions involve the transformation of substances through breaking and forming chemical bonds, leading to the production of new substances with different properties from the reactants. This process alters the original materials on a molecular level, creating compounds that are chemically distinct from the starting materials.

Compound Formation

Compound formation is the process by which two or more elements chemically combine in fixed ratios via chemical reactions to produce a new substance, known as a compound. Unlike mixtures, compounds have properties that are distinct from those of their constituent elements, and the substances in a compound cannot be separated by simple physical methods.

Transcript

00:01 Okay, so you have a, uh, a teaspoon of magnesium, and you have a teaspoon of sulfur and their place together in a beaker, and they want to know if it's a mixture or a pure substance.

00:13 So, um, so the fact that they say they're placed together in a beaker.

00:20 Um, so you have two substances that are the mixed together, right? so when you when you have two substances together, and you whether solids liquids gases, they're different phases whenever it's still a mixture.

00:32 So the magnesium and the sulphur when they're separate.

00:36 So when they're both sitting on the spoons before you put them in the beaker, they're both pure substance is because you have pure magnesium metal in one spoon, you have pure sulphur metal in the other spoon, but as soon as you put them together, it becomes a mixture.

00:50 They're both no longer pure.

00:52 You have to find some way to separate the magnesium from the sulfur, um, right, but that all changes right, so they have a mixture of magnesium filings and sulfur, but that changes when you heat it.

01:05 So when you heat it, it says that you form magnesium sulfide, which has the chemical formula of m.

01:11 G s, so this is now different.

01:16 This is very different from having, um, magnesium and sulfur mental.

01:23 Um, magnesium metal and powder sulfur separate together in the same.

01:28 Bigger because that's still magnesium plus...

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