Diagrams - Water Chemistry�

- atomic diagrams H, O

- covalent bonding, polarity, neutrality

- cohesion/adhesion

- heat is absorbed and ice floats

- solvent + solute = solution

- acids and bases

- dehydration synthesis / hydrolysis

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Atomic Diagrams:

Hydrogen Oxygen

Polarity of Water

Polarity of Water and Cohesion/Adhesion

We STICK TOGETHER We STICK to OTHER THINGS

Opposites attract

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COHESION

ADHESION

- heat is absorbed and ice floats

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Water absorbs heat

• Keeps earth’s temp. more stable

Water absorbs heat

• Keeps body temp. more stable
• Sweat absorbs heat as it evaporates to cool you

Ice floats

-water rarely completely freezes and liquid is insulated below

- Solvent + Solute = Solution

H₂O NaCl Salt Water

Solvent (dissolves other) Solute (is dissolved) Solution (together)

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Because water is POLAR, many things dissolve in water - important for life

NON-POLAR substances like fats/oils are insoluble in water

pH Scale

H₂O can split into H⁺ and OH^-

Neutral pH of 7 when H⁺ and OH^- are equal

Buffers make things more neutral

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- dehydration synthesis / hydrolysis

The removal of water joins monomers into polymers

The addition of water breaks polymers into monomers

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H OH

H OH

H

OH

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+H₂O

HYDROLYSIS Dehydration Synthesis