water_properties_part_1.pptx

7/27/2019 water_properties_part_1.pptx

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Lets Get Started!

1. TJ chose the dotted line (B) to represent ahydrogen bond. Do you agree with TJ? Write why

you do or do not agree.

2. Write why water is referred to

as a polar molecule.

A

B


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60%

73%

97.5%

0.007% of all water on earth


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Rate Your Self!

Before After

4

1 2 3 4 1 2 3 4


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Waters Emergent Properties

H2O

1. 2.

3. 4.

EmergentProperties of


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Chemistry of water

Water is a POLAR molecule.

This means it has covalent bonds that do not

share electrons equally.

The oxygen is slightly negative, thehydrogens

are slightly positive.


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Chemistry of Water

Water moleculesform HYDROGENBONDS with otherwater molecules.

The positive Hs areattracted tonegative Os

This creates a weakbond, and a stickymolecule


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Video!


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What makes water sticky?


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Cohesion

Surface tension Is a measure ofhow hard it is to break the surface

of a liquid

Is related to cohesion


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Cohesion and Adhesion

Helps pull water up through the microscopic vesselsof plants (capillarity) Capillary action

Adhesion = water sticks to other surfaces

Transpiration = the movement of water through a

plantleading to evaporation through the stomata

Cohesion

Water conducting cells

100 mFigure 3.3


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Cohesion Concept Map1. Cohesion

Is due to hydrogen bonding

where water sticks to other water molecules

Like molecules bonding to each other (water attracting

other water molecules)

Surface tension

Is a measure of how hard it is to break the surface of a liquid

Capillary action

Helps pull water up through the microscopic vessels

of plants (capillarity)

Adhesion

water sticks to other surfaces

Transpiration the movement of water through a

plant leading to evaporation through the stomata


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A mixture is a combination of substances inwhich the individual components retain their

own properties.

For example, if you mixed sand and sugar, you

could still tell the individual grains apart.

Mixtures and Solutions


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Mixtures and Solutions

A solution is a combination of substancesin which the individual components

combine and form a new, different

substance.

For example, Kool-aid powder dissolves in

water to make a tasty drink.


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The Solvent of Life

Universal Solvent2. Universal Solvent

Water is a good solvent due to its

polarity

Polar molecules surround positive and

negative ionsWater (solvent) dissolves salt (solute)

creating an aqueous solutions


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Draw this picture on the front panel

and color it!2. Universal Solvent


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Hydrophilic

The prefix Hydro hmmm

Hydrophilicmeans water loving

Substances that are hydrophilic have an

affinity for water

They are also polar and dissolve easily


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Hydrophobic

Hydrophobicmeans water-fearing

Substances that are hydrophobic do not

have an affinity for water and do not

dissolveThey are also non-polar

Examples include oil, wax, and fat


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Universal Solvent Concept Map1. Universal Solvent

Water is a good solvent due to its polarity

Water (solvent) dissolves salt (solute)

creating an aqueous solutions

Hydrophilicmeans water lovingThey are also polar and dissolve easily

Hydrophobicmeans water-fearing do not

dissolve

They are also non-polar

Examples include oil, wax, and fat


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Reflection

Water is essential for life. Its special propertiesmake water the single most important molecule

in plant life. What property of water enables it to

move from the roots to the leaves of plants andwhy?

Slap it on the wall!

water_properties_part_1.pptx

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