Water & Its Properties Whole Lesson
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Transcript of Water & Its Properties Whole Lesson
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REARRANGE THE KEY WORDS!• LOPAR• ALTTEN THAE• PESCICF THAE• ESDNITY
• MIBLESCMI• VOLSTNE• OHEONCIS• DASONHIE
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L1. WATER & ITS PROPERTIES
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LEARNING OUTCOMES:
Suggest some properties of water (D) Draw the structure of a water molecule include the dipole charge (C)
Link the properties in water to its uses in nature (A)
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WATER A water molecule (H2O), is made up of three atoms --- one oxygen and two hydrogen.
H
HO
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HYDROGEN BONDS EXIST BETWEEN WATER MOLECULES
Formed between a highly Electronegative atom of a polar molecule and a Hydrogen
One hydrogen bond is weak , but many hydrogen bonds are strong
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INTERACTION BETWEEN WATER MOLECULES
Negative Oxygen end of one water molecule is attracted to the Positive Hydrogen end of
another water molecule to form a HYDROGEN BOND
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PROPERTIES OF WATER
Cohesion Adhesion High Specific Heat High Heat of Vaporization Less Dense as a Solid
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COHESION …
Helps insects walk across water
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COHESION Attraction between particles of the same substance ( why water is attracted to itself)
• Results in Surface tension (a measure of the strength of water’s surface)
Produces a surface film on water that allows insects to walk on the surface of water
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ADHESION• Attraction between two different substances.• Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton.
Capillary action-water molecules will “tow” each other along when in a thin glass tube.
Example: transpiration process which plants and trees remove water from the soil, and paper towels soak up water.
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ADHESION CAUSES CAPILLARY ACTION
Which gives water the ability to “climb” structures
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HIGH SPECIFIC HEAT• Amount of heat needed to raise or lower 1g of a substance 1° C.
Water resists temperature change, both for heating and cooling.
Water can absorb or release large amounts of heat energy with little change in actual temperature.
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WATER IS LESS DENSE AS A SOLID
• Ice is less dense as a solid than as a liquid (ice floats)
• Liquid water has hydrogen bonds that are constantly being broken and reformed.
• Frozen water forms a crystal-like lattice whereby molecules are set at fixed distances.
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Water is Less Dense as a Solid
•Which is ice and which is water?
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Water is Less Dense as a Solid
Water Ice
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WHY DOES ICE FLOAT IN WATER?
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DEMO OF PROPERTIES OF WATER
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COMPLETE PAST PAPER QUESTION
Biological-molecules-question. Q1-3
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WIDER READING: LINK TO BE SET AT END OF WEEK
HOMEWORK: q2