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

Key Concepts

Pure Substance

A pure substance is a form of matter that has a fixed composition and specific properties. It can be an element, which is made up of a single type of atom, or a compound, which is composed of two or more different elements chemically combined in a definite ratio. Pure substances display consistent behavior and characteristics under given conditions, making them uniform in both composition and appearance.

Mixture

A mixture consists of two or more substances that are physically combined rather than chemically bonded. The components in a mixture retain their individual properties and can usually be separated by physical means. Mixtures can be homogeneous, where their composition is uniform throughout, or heterogeneous, where the constituents are visibly distinguishable.

Element

An element is a pure substance that cannot be broken down into simpler substances by typical chemical means and is composed of one type of atom. Each element is defined by its number of protons in the nucleus, known as the atomic number, and forms the basic building block of matter in the periodic table.

Compound

A compound is a pure substance formed when two or more elements are chemically bonded together in a fixed ratio. The properties of a compound are distinct from those of the constituent elements, and compounds can only be separated into their component elements through chemical reactions. This fixed combination imparts a unique identity to each compound.

Transcript

00:01 First of all, we must know that substances, so on the basis of purity, they can be of two types, either the substance is pure or either it is impure.

00:26 So if substance is pure, so pure substance that can be further of two types, element and compound.

00:49 So element consists of one kind of atoms and element is made up of one kind of atoms.

01:10 Example like we have sodium metal here.

01:16 So sodium is an element made up of sodium atoms.

01:20 Like we have copper.

01:21 Okay.

01:23 Copper.

01:23 So that is.

01:24 Also metal and that consists of copper atoms.

01:28 So this is how we can say that we have elements and now when we talk about compounds.

01:37 So compound consists of two or more atoms made up of two or more atoms combined in fixed.

02:14 Ratio by mass okay so that is called compound that it is made up of two or more kind of atoms but they are combined in a fixed ratio okay that ratio do not change example we have like h2o water okay so we know that every time we have two hydrogen atoms here and one oxygen atom okay and they are combined in a fixed ratio and suppose we have co2 carbon dioxide okay so that are the compounds when we have impure substance so impure substance that is of mixture okay the impure substances are mixtures so what do we mean by mixture made up of two or more constituents not combined in fixed ratio.

04:10 So example, we have salt in water, or we have tea, etc., so.

04:38 So these are mixtures because we can add salt in water and the quantity of salt that can be larger amount, that can be very small amount, okay? that is we can add 1 teaspoon of salt, we can add 2 teaspoons, 10 teaspoons, 15, 35, okay? so in any case, we have the mixture, salt and water.

05:06 So the quantity is not fixed.

05:09 That can we can use as we want.

05:14 We have tea.

05:14 So tea is a combination of tea leaves and sugar and water...

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