premus colours and acidity. rationale and core concepts colour acid/base colour mixing...
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Premus
Colours and acidity
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Rationale and Core Concepts
Colour Acid/Base Colour mixing (misconceptions) Transportation of water in a plant
We chose this activity because it is impressive and interesting for children.
Materials are easily available at home
It can be adapted to various age groups
Active learning
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Expected Outcomes
That the children will be able to understand how acids and bases react with a variety of substances
That the children will understand that there are exceptions to the rules of colour mixing
That the children will understand how water travels in a plant and how it takes minerals and nutrients from the ground.
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Target Group, Setting, Space and Time
10-12 year olds
Laboratory/ Home
2 lessons
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Activity 1 – Acidity and Baseness (Home)
The children and parents/guardians will boil a small amount of red cabbage.
They will drain the water into five separate transparent cups
They will add vinegar to one of the cups and note the change of colour.
They will add baking soda to 3 of the other cups in varying amounts (given by the teacher) creating the colours blue, yellow and green.
They will then mix the red solution with the yellow solution and note the colour change
Activities (1)
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Activities (2) Activity 2- Water Transport in a Plant (Classroom)
The children will place water in the cups
The children will place some different food colourings in the cups
They will then place white flowers in the cups and wait about two hours
The children will observe the change ( the flowers absorb the water as always, but as it was colourful the flower will show this colour change)
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Activities (3) Activity 3- Discussion (Classroom)
Vinegar/soda and acid/base
Conceptions of colour change were questioned?
Poppy vs. Corn flower
Water transport
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Materials Activity 1
Red cabbage
Five transparant cups Vinegar Baking soda
Activity 2 White flowers Cups Water Food colouring
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References Activity 1. Red Cabbage Indicator
chemistry.about.com/od/acidsbase1/a/red-cabbage-ph-indicator.html
Activity 2. Flower Colouring
O Lugar dos Amiguinhos
encontrodeamiguinhos.blogspot.gr
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Famous Italian director