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Water is sticky

Pourquoi est-ce que L'eau est collante? 

Why is water sticky? 
Water is made up of two elements:
hydrogen and oxygen and chemical formula
is
H2O.

It means two hydrogen molecules
​are bonded with
one oxygen molecule.

Water has three states,
• when liquid it is called water
• 
 when gas it is called vapour
• when solid it is called ice
L'eau est composée de deux éléments: l'hydrogène et l'oxygène et la formule chimique est H2O.

Cela signifie que deux molécules d'hydrogène sont liées à une molécule d'oxygène.

L'eau a trois états,
• quand le liquide s'appelle eau
• quand le gaz est appelé vapeur
• quand solide il s'appelle glace
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DEPPER LEARNING: 

Drops On A COIN Lab - EXPLAINED!

 
Cohesion:  
​
Water molecules are attracted to other water molecules. Water is sticky and clumps together into drops because of its cohesive properties.

 
​

If you've played with bar magnets you will know that the positive (+) side of one magnet will repel the other positive side, while a negative (-) side of one magnet will attract the positive side of the other magnet. Positive charges attract negative charges.
 
The oxygen end of water has a negative charge and the hydrogen end has a positive charge. The hydrogens of one water molecule are attracted to the oxygen from other water molecules. This attractive force is what gives water its cohesive (sticky) properties.


Surface Tension: 
Surface tension is the name we give to the cohesion of water molecules at the surface of a body of water. The cohesion of water molecules forms a surface "film" or “skin.” Some substances may reduce the cohesive force of water, which will reduce the strength of the surface “skin” of the water.


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POURQUOI est-ce que l’eau est collante (sticky)? 
Why is water sticky? 
​
• Explain to a partner in your own words. 




USE SEESAW to record your learning: 


After completing our "Coin droplets experiments" and reading about water properties,
please complete the following:

1) Build water molecules with your sour patch candy
2) Take a picture of what you have build
3) Explain which colour represents Hydrogen or Oxygen. For example: Blue candy = Hydrogen with a positive charge. Orange Candy = Oxygen with negative charge
4) Explain why water is sticky? (Use the following vocabulary: Cohesion, bonding, surface tension, positive/negative charge)
5) Give a real-world example that demonstrates how water is sticky. (Hint: Surface tension)


Quick Facts about water from: https://easyscienceforkids.com/water-molecules-video-for-kids/
​
  • About 70% of our body is also made up of water. And at the time of our birth, the figure was 80%.
  • Water is a good solvent. It easily dissolves with salt, sugar and other acids. But some other things like fat, oils etc. do not mix with water.
  • Pure water does not have any colour, smell or taste as it has a pH around 7.
  • In normal conditions, water boils at 100°C and freezes at 0°C.
  • Frozen water means ice takes up more space than the liquid form. It is the reason why many water pipes burst in winters.
  • At the polar ice caps of the planet mars, water is found in the form of ice.
  • The temperature of your surroundings decides the amount of water you require each day.
  • Flowing water can generate electricity. This entire process takes place in hydroelectric power stations.
  • More than 70% surface of our planet is covered by water with an approximate amount of 325 million cubic miles.
  • 8% of the world’s water is in the form of ice and cannot be used.
  • A person can live 30 days without food but cannot survive more than 7 days without water.
  • More than 90% of world’s fresh water is in Antarctica and cannot be used.
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