Products from Raw Materials

Suspension• A mixture in which particles ofa material are dispersed through-out a liquid or gas but are largeenough that they settle out.

– Particles are insoluble, so they DO NOT dissolve in the liquid or gas.

– Particles can be separated using a filter.• Examples:• Salad dressing• Medicines that say“shake well before use”

Colloids

• A mixture in which the particles are dispersed throughout but are not heavy enough to settle out.

• Made up of solids, liquids and gases.– Examples :

• Mayonnaise• Stick deodorant• milk

Mixing Pure Substances

• Pure substances can be mixed together to form solutions that are liquid, gas or solid.

• Most metals we use are combinations of two or more metals mixed together.

Alloys

• An alloy is a homogeneous mixture of metal with other substances.

• Alloys allow scientists to design metals that have specific properties depending on what they are used for.

• Metals• http://www.brainpop.com/science/

matterandchemistry/metals/preview.weml

How an Alloy is Made

• Steel is formed in a process that takes iron from iron ore and carbon from coal.

• Small amounts of other metals are mixed in to give the metal specific properties.

Uses of Alloys

• Thousands of years ago civilizations melted tin into copper to create a new substance called bronze.

• Bronze was used to create jewellery, armour, tools and weapons.

Modern Alloys

• Metallurgists (people who study metals) have created many different alloys, each having its own specific properties.

• Aluminum is lightweight and used in alloys to make engines, airplanes and bicycle frames.

• http://www.ndep.us/Making-Metal

Text Book Questions

• Page 43– 1 – 2 a, b– 3– 4