2.2 Properties of Water Water’s unique properties allow life to exist on Earth.
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Transcript of 2.2 Properties of Water Water’s unique properties allow life to exist on Earth.
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2.2 Properties of Water
Water’s unique properties allow life to exist on Earth.
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2.2 Properties of Water
OHH
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++
• Water is a polar molecule.– Polar molecules have slightly charged regions.
– Non-polar molecules do not have charged regions.
O
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2.2 Properties of Water
Hydrogen bonds form between slightly positive hydrogen
atoms and slightly negative atoms.
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2.2 Properties of Water
Hydrogen bonds are responsible for three important properties of water.
1. High specific heat
2. Cohesion (same substance)
3. Adhesion(different substance)
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2.2 Properties of Water
Many compounds dissolve in water.
• A solution is formed when one substance dissolves in another.– A solution is a homogeneous mixture.– Solvents dissolve other substances.– Solutes dissolve in a solvent.
solution
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2.2 Properties of Water
• “Like dissolves like”
– Polar solvents dissolve polar solutes.– Nonpolar solvents dissolve nonpolar solutes.– Polar substances and nonpolar substances generally
remain separate.
Salt into Water Vitamins into Oil Oil and Water
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2.2 Properties of Water
Some compounds form acids or bases.
• An acid releases a hydrogen ion when it dissolves in water.– high H+ concentration– pH less than 7
more acidic
stomach acid pH between 1 and 3
Vinegar-3Coffee-5Milk-6
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2.2 Properties of Water
• A base removes hydrogen ions from a solution.
– low H+ concentration– pH greater than 7
bile pH between 8 and 9
more basic
Baking Soda-9Tums-11Ammonia-12
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2.2 Properties of Water
• A neutral solution has a pH of 7.
pure water pH 7