CATALYST 1.Write down all the uses for water you can think of.
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Transcript of CATALYST 1.Write down all the uses for water you can think of.
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CATALYST
1.Write down all the uses for water you can think of.
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Objectives: SWBAT
□Identify the three properties of water and explain water’s importance in life.
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RECALL…• What is the chemical symbol for water?
H2O
• What is water made of?
Hydrogen and Oxygen
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Shared electrons
Hydrogen Hydrogen
Oxygen
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Water & Its Importance• Water is perhaps
the most important compound in living organisms.
• Water makes up 70% – 95% of most organisms.
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Take Notes!
Why is water so important?
Water makes up 70% – 95% of most organisms
Topic: Properties of Water
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Water Is Polar• Sometimes, when
atoms form bonds, they do not share the electrons equally. This is called a polar bond.
• A polar molecule is a molecule with an unequal distribution of charge; that is, each molecule has a positive end and a negative end. – Ex: water
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Sugar Molecules Dissolving
Water can dissolve many compounds, such as salt, and many other polar molecules, such as sugar.
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Water has surface tension
• Water molecules also attract each other (hydrogen bonding)
Floating on water Capillary action
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Fresh morning dew on a Water Horsetail
Surface tension prevents a coin from sinking: the coin is denser than water, so it cannot be floating due to buoyancy alone.
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Water Resists Temperature Changes
Water resists changes in temperature. Therefore, water requires more heat to increase its temperature than do most other common liquids.
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Why does ice float?
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Why do roads crack in places with cold winters?
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Why do bottles/cans filled with water sometimes explode after sitting in the freezer?
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Water Expands When It FreezesIce is less dense than liquid water so it floats as it forms in a body of water.
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Take Notes!
Why is water so important?
Water makes up 70% – 95% of most organisms
1. Water is polar (has a + and - end)
2. Water resists temperature changes
3. Water expands when it freezes
Topic: Properties of Water
Unique properties of water
How do living things use water?
- Maintaining temperature- Transportation in the body- Dissolving things (ex: sugars)- Digesting food, breathing, and lubricating joints
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• HYDROPHOBIC- water hating, when water (polar) is combined with a non polar substance
Example- drops of water on a leafOR oil in water
• HYDROPHILIC – water loving, when water (polar) is combined with a polar substance
Example- Food, Sugars
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1. Water is made from 2 different elements: positively charged _____________ and negatively charged _____________.
2. Water’s ___________ is what makes the molecules clump together into round drops and also causes the skin, or _________________ that forms on the surface of water.
3. Water is known as the ______________ solvent, which means it is good at dissolving just about anything.
4. The salt dissolved in sea water _________ the oceans freezing point.
5. Water is the main ingredient of our ________, fills our cells, and makes up about ____% of our body weight.
6. Water covers over ____% of our Earth’s surface
Surface tension
Oxygen
stickiness
universal
lowers
blood
Hydrogen
65
70