gr7

gr7

Monday 12 November 2012

nov 12 science & math


Science: Unit 1 Review

The 3 states of matter are solids, liquids, and gases.  Matter is anything that has mass and takes up space.

Chemistry can often imitate or copy matter found in nature using artificial  chemicals producing man-made flavors, scents and even colors.

All matter is made up of tiny, microscopic particles.  They have empty spaces between them and are moving randomly all the time.  They move faster  and spread father apart when they are heated.  They are also attracted to each other and stay together instead of flying apart.

A solid has a definite shape and a definite volume.

A liquid has a definite volume and takes the shape of its container.

A gas does not have a definite volume or shape; it expands to fill the shape and volume of its container.

As liquid water is heated, the water particles move farther apart causing the water to change to water vapour or steam.

A pure substance is made up of only 1 type of substance.  3 examples include salt, sugar, baking soda.

A mixture is matter that is made up of 2 or more pure substances.  3 examples include milk, water, fat.

2 examples of hazardous or dangerous pure substances that should never be discarded into regular garbage include mercury, uranium.

A mechanical or heterogenous mixture is one where you can see the different parts of the mixture because the particles weren’t evenly mixed such as garden soils or omelettes.

A solution or homogenous mixture is one that looks like 1 pure substance but is really made up of different particles that were evenly mixed such as shampoo or   stainless steel.
 
 






 
terry fox, poppy & civies day $ due wednesday