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When plotting the line on the lined paper always remember:

1. Use a sharp pencil

2.  Use a ruler

3.  Draw two axes (across = horizontal, up = vertical) - try to make the graph as big as possible.

4. Chose the correct type of graph. Bar graph for grouped data or line graph for continuous data.

5. Choose a sensible scale for both axes. Remember each square should be the same number.

6.  Label the axes   e.g. Temperature, height, weight, speed.

7.  Add the units to the axes label e.g. (°C), (cm), (Kg), (m/s)

8.  Plot the data onto the graph

9.  Add a title, you can use the heading of the x & y axes to help. Eg ‘A graph to show….’

10. Underline the title

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The controlled variables are what you must keep the same in order to maintain a fair test. 

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The controlled variables are what you must keep the same in order to maintain a fair test. 

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The independent variable is the factor that we change during an investigation.

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The independent variable is the factor that we change during an investigation.

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During the lesson, we have investigated the how temperature influenced the solubility of sugar in water. Now we will:
-learn how to calculate the solubility
-plot the line graph
-make sense of the graph

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The property of a material describing how well it will dissolve in a liquid is ... solubility.

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The property of a material describing how well it will dissolve in a liquid is ... solubility.

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When a solid dissolves in water it is said to be … soluble.
  
 

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When a solid dissolves in water it is said to be … soluble.
  
 

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  The
  name given to a substance dissolved in a liquid is a …solute.
  
 

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  The
  name given to a substance dissolved in a liquid is a …solute.
  
 

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  A liquid in which a solid will dissolve is called a 
  
  
  … solvent.
  
 

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  A liquid in which a solid will dissolve is called a 
  
  
  … solvent.
  
 

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  A liquid that
  has a solid dissolved in it is called a …solution.
  
 

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  A liquid that
  has a solid dissolved in it is called a …solution.
  
 

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  The process where a solid becomes part of a liquid is
  called … dissolving.
  
 

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  The process where a solid becomes part of a liquid is
  called … dissolving.
  
 

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Now, each of you will  practice calculating the solubility and plotting the solubility curve.   You will need to write your date and the number of the task in your workbook. You will then choose and complete one of the three tasks  on solubility below. 

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Now, each of you will  practice calculating the solubility and plotting the solubility curve.   You will need to write your date and the number of the task in your workbook. You will then choose and complete one of the three tasks  on solubility below. 

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All calculations must be recorded in your workbooks.

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For step-by-step instructions on how to draw line graphs click on the licks below

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For step-by-step instructions on how to draw line graphs click on the licks below

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Watch a video explaing solubility curves and their interpritation

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Solubility Curves | Properties of Matter | Chemistry | FuseSchool

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Solubility curves are a graphical representation of the solubility of a certain salt over a temperature range.
This curve was created using data from the table.

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We have learnt from the experiment, that the solubility of sugar increased with the temperature. But how can we calculate solubility?

Solubility= mass of solute / volume of solvent

So, we can say that solubility of sugar in tea (water) at 20 °C is 204 grams per 100 cm3 of water.

If we have measured the mass of the sugar added to water, and the temperature of the water we would receive the following table showing the solubility of sugar at different temperatures.