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PHISICS AND CHEMESTRY

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PHISICS AND CHEMESTRY
 

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PHISICS AND CHEMESTRYOnline version

UNIT 1

by creu ahuir
1

Pure substances are .

2

A solution is a of that seems .

A solution is composed by two parts : the and the .

The propierties of a solution are determined by the and its on it . Examples of properties can be the density , the colour , the temperature . . .

3

The solvent is the in the solution and the solute is the in the solution .

4

In this term we are going to study solutions , this are solutions in wich the is . In this solutions the solvent can be in , or .

If the solute is gas or solid , it can be or .
If the solute is liquid , it can be or .

5

A soluble solute is a solute that forms an when it's mixed with water , we see the components of this solution separately .

A insoluble solute is a solute that when it's mixed with water forms an in with we see its components separately .

6

A miscible solute is a that with water .

A inmiscible solute is a that with water .

7

The concentration of a solution is the in a . It mesures how is a solution .

There are three main different ways to express the concentration in a mixture :

1 . % in mass = mass of the solute / mass of the solution ( solution = solute + solvent ) * 100
2 . % in vol = vol of the solute / vol of the solution ( solution = solute + solvent ) * 100
In this two formulas doesn't mind the unit that we use but it has to be up and down the dividing bar .
3 . mass * volume = mass of a solute ( g ) / vol of a solution ( L / dm^3 )

8

The difference between concentration and density is that concentration is useful to know the of a that it is in a , and we use density to make a between and .

9

The solubility of a substance is the of that can be in a .

10

The rate of dissolution is the of the that can be in . Is usually used with solutes .

If the solubility increases , the rate of dissolution .

11

Relationships with other variables :
- In solid solutes , if the temperature increases , the solubility , and the rate of dissolution .
- In gas solutes if the pressure increases , the sollubility , and the rate of dissolution . And if the temperature decreases the sollubility , and the rate of dissolution .

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