Elements, Atoms, Compounds and

Molecules

By Samantha Bennett

What is an atom?

An atom is fundamental piece of matter which it is made up of protons, neutrons and electrons

What is an element

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

Metals

Metal is an element, compound, or alloy that conducts heat and electricity.

Copper

Non metals A non-metal is an element on 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.

Phosphorus

Compounds

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

Chemical reaction

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

Identifying chemical reactions

Heat and light gas or precipitate

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 - you can't 'unburn' it

Chemical and physical reactions

Factors affecting a reaction rate?

Temperature, concentration, size of particles or using a catalyist

Bibliography http://www.qrg.northwestern.edu/proje

cts/vss/docs/Propulsion/1-what-is-an-atom.html

http://www.ncbi.nlm.nih.gov/pccompound

http://web.jjay.cuny.edu/~acarpi/NSC/6-react.htm

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