Elements, Compounds and Mixtures

Compounds and Mixtures

Objectives

Define compounds as substances consisting of two or more chemically combined elements

Define mixtures as two or more elements and/or compounds that are not chemically combined

Lists examples of compounds and mixtures.

Compare characteristics of mixtures and compounds.

Compounds and Mixtures

Compounds and Mixtures

How do elements join up together to form matter?

Matter are either made up of

(1)purely elements

(2)compounds of elements

(3)mixtures of elements and/or compounds

Compounds and Mixtures

Compounds

Consists of two or more elements that are chemically combined together.

Examples of Compounds

Salt SugarCarbon dioxide Water

Compounds and Mixtures

Pictorial Diagram of Compounds

Element A

Element B

Compounds and Mixtures

Mixtures

Consists of two or more elements and/or compounds that are NOT chemically combined together.

Examples of Mixtures

Air Bronze Carbonated drinks

Compounds and Mixtures

Pictorial Diagram of Mixtures

Element A

Element B

Mixture of 2 elements

Compounds and Mixtures

Pictorial Diagram of Mixtures

Element A

Element B

Element C

Mixture of 2 compounds

Compounds and Mixtures

Pictorial Diagram of Mixtures

Element A

Element B

Element C

Mixture of 2 compounds and 1 element

Compounds and Mixtures

Characteristics of Compounds and Mixtures

Compounds Mixtures

Formed with chemical reactions

Different characteristics from constituents

Cannot be broken up into constituents by physical means

Formed without chemical reactionsSimilar characteristics from constituents

Can be broken up into constituents by physical means

Compounds and Mixtures

Question

Water is made up of hydrogen and oxygen. Why is it a compound?

Compounds and Mixtures

Question

Water is made up of hydrogen and oxygen. Why is it a compound?

Hydrogen and oxygen are gases, water is a liquid. Hydrogen and oxygen can burn, water cannot.

Since water have different characteristics compared to its constituents, and can only be split up by passing electricity through it. Water is a compound.

Compounds and Mixtures

Question

Mixture or compound?

Mixture of 1 compound and 1

element

Compounds and Mixtures

Question

Mixture or compound?

Mixture of 1 compound and 2

elements

Compounds and Mixtures

Question

Mixture or compound?

Neither, pure element

Compounds and Mixtures

Question

Mixture or compound?

Pure element.

Conclusion

Matter are made up of either purely elements, compounds or mixturesCharacteristics of compounds are different from their constituentsMixtures retain some characteristics of their constituents