Compounds And Elements

Objectives:3.3 Describe a pure substance as a

compound or an element, after conducting an experiment.

3.4 Analyze a compound.

Classification: Everything in the world that has a mass

is called “matter” Matter can be classified as:

Matter

Pure Substance Mixture

Element Ex. gold

Compound Ex. water

Hetero-geneous Mixture

Homo-geneous Mixture

Matter:anything that takes up space & has a

mass

Ex. a deskEx. pizzaEx. silver necklaceEx. oxygen

Mixture: combinations of two or more substances

that are not chemically combined (mixed)

Easily separatedEx. fruit saladEx. sugar in coffee

Pure Substance: composed of a single substance with the

same properties throughoutEx. waterEx. table salt

simplest form of matter

cannot be separated or broken down into simpler substance

Ex. Oxygen Ex. Aluminum Ex. Gold Ex. Copper

A pure substance can be further broken down into an element or a compound……Elements:

substance made of two or more elements

can be separated into simpler substance

Ex. Water (H2O)

Ex. Carbon dioxide (CO2)

Ex. Sugar (C6H12O6) Ex. Salt (NaCl)

Recall, a pure substance can be further broken down into an element or a compoundCompounds:

NOTE:With chemical reactions you can go from an element to compound & vise versa!!!

Element Compound

HO

Ex. oxygen & hydrogen

Ex. water (H2O)

H

OH H

State whether the following are examples of an

element or a compound.

A gold ring

Rust (Fe2O3)

Carbon monoxide (CO)

Aluminum Foil

Calcium

element

compound

compound

element

element

State whether the following are examples of an element or a

compound or a mixture

A blueberry muffin

Chunky Soup

Salt (NaCl)

Helium

Water (H2O)

mixture

mixture

compound

element

compound

Element Compound

Mixture Compound

State whether the following pictures represent an element or a compound or a mixture

Which statement best describes a compound.

A) A pure substance that has a high melting point.

B) A mixture that is formed by two or more elements.

C ) A pure substance that is formed by two or more elements.

Mixture: 2 or more components brought together that

can be separated physically Pure Substance

A single substance with the same properties throughout

Element Simplest form of matter that can not be

broken down Compound

2 or more elements chemically combined