October 23, Friday

Science 9 - notes
Physical Changes (from mini-movie)
A physical change is a change in shape, state and size without adding any new substance.
For example: water changes state from solid, liquid and gas. Peanuts, when ground change to peanut butter, there is a change in state, size and shape; but there is no other change.
MIXTURE
A mixture is when two or more parts are blended together and keep their own properties.
Example: salad, bridge mixtures or tacos. Other examples include: tea (which can be strong or weak), sugar and water, or air mixture of different gases.
In a mixture, you can have a physical separation by taking the pieces apart; ie. Use a magnet to separate the magnetic pieces from a powder.

SOLUTION
A solution is a difficult to separate MIXTURE; substances are completely blended and properties are not changed. Substances stay blended such as: tea, fruit juice, soft drinks, water and sugar, salt and water.
Solubility: the measure of the amount of dissolving one substance in another.

A mixture of metals is a solid solution
Air is a solution of several gases.


MATH 9
We are working on adding, subtracting, multiplying and dividing fractions. Also this week, we studied relative frequency and scatter plots. All these topics will be on the midterm. See my wikiblog for Math 9 powerpoint on fractions.