Chemical Reactions EL

Elements, Atoms, Compounds and Molecules

ATOM

An atom is a fundamental piece of matter. Atoms are made up of protons, neutrons and electrons.

Nucleus

Protons

Neutrons

Electrons

ELEMENT

An element is a substance that is entirely made up of one type of atom.

METAL

A metal is an element, compound or alloy that conducts electricity and heat. Metals are malleable and ductile.

Copper

NON-METAL

A non-metal is an element in the periodic table that does not have the properties of a metal element such as malleability. Non metals are usually found as gases in nature or weak, brittle solids.

Sulphur

THE PERIODIC TABLE

The Periodic Table is a tabular display of the chemical elements.

WHAT IS A COMPOUND

A chemical compound is a pure chemical substance consisting of two or more different chemical elements.

WHAT IS A CHEMICAL REACTION?

A chemical reaction is a process that leads to the transformation of one set of chemicals substances to another.

WHAT IS THE DIFFERENCE BETWEEN A CHEMICAL AND PHYSICAL REACTION?

A physical change is reversible, a chemical change is not. For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change because you can’t reverse it.

IDENTIFYING CHEMICAL REACTIONS

Heat, light, gas or precipitate

WHAT FACTORS AFFECT A REACTION RATE?

Temperature, concentration, size of particles or using a catalyst.

BIBLIOGRAPHY

http://www.qrg.northwestern.edu/projects/vss/docs/Propulsion/1-what-is-an-atom.html

http://education.jlab.org/qa/element.html

http://en.wikipedia.org/wiki/Periodic_table