Water and it s properties
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Water and It’s properties. Sections 2.1-2.4, 2.7-2.18. Do Now. 1. How do we rely or use water in our everyday life ? 2. Why is water so valuable?. Do Now. 1. Why were our results so scattered yesterday? 2. When we repeat the penny water/isopropanol today, what would you do differently?

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Water and It’s properties

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Water and it s properties

Waterand It’s properties

Sections 2.1-2.4, 2.7-2.18


Do now

Do Now

  • 1. How do we rely or use water in our everyday life?

  • 2. Why is water so valuable?


Do now1

Do Now

  • 1. Why were our results so scattered yesterday?

  • 2. When we repeat the penny water/isopropanol today, what would you do differently?

  • 3. Take out your investigating water properties handout.


Do now2

Do Now

  • What is chemical formula for water?

  • What does a water molecule look like? Draw one.

  • List one property of water from the reading that makes it unique.


Objectives

Objectives

  • SWBAT identify unique properties of water by performing a water activity and then discussing the results

  • SWBAT define properties of adhesion, cohesion, polar, nonpolar, and hydrophobic/hydrophillic of water and relate it water activity


Water activity

Water Activity

  • How many drops of water can you place on the surface of a penny?

  • How many drops of isopropanolcan you place on the surface of a penny?

  • Use the handout and create a data table and drawing of the penny.


What does water look like

What does Water Look like?

  • Let’s draw it!

  • Atom:

  • Molecule:

  • Polar:


Water video

Water Video

  • We can use the properties of water to explain why the large number of drops can be placed on the surface.

  • https://www.youtube.com/watch?v=aVmU3CLxvgU


Do now3

DO Now

  • Explain why the penny makes a dome shape of water in the “drops on a penny” activity.

  • Explain why a drop of isopropanol causes the dome of water to break.


Objectives1

Objectives

  • SWBAT identify unique properties of water by performing a water activity and then discussing the results

  • SWBAT define properties of adhesion, cohesion, polar, nonpolar, and hydrophobic/hydrophillic of water and relate it water activity


Water contains polar covalent bonds

Water contains Polar Covalent bonds

  • Polar:

  • Covalent:


Water contains hydrogen bonds

Water contains hydrogen bonds

  • -Hydrogen bonds are weak bonds between like molecules

  • -Partial positive charge attracts a partial negative charge


What forms a drop

What forms a drop?

  • -Cohesioncauses water to form drops

  • Cohesion: attraction of water to water

  • -Surface tension causes the drops to be spherical

  • -Adhesion keeps the drops in place

  • Adhesion: attraction of water to unlike substance


Surface tension

Surface Tension:

  • Water pulls in and attracts itself to form a “film” on its surface to form a drop


Water drop shapes

Water Drop Shapes

  • -Water has cohesion to itself and forms a nice, round drop

  • -Round drop on wax paper (not strong adhesion to water)

  • -As adhesion to glass is stronger and pulls the water, it makes a flatter drop


Water on wax paper

Water on Wax Paper


Water coheres to polar not nonpolar

Water coheres to polar, not nonpolar

  • -“Like adheres to Like”

  • -Polar molecules will attach to polar and nonpolar will attach to nonpolar

  • -Water (polar) has no adhesion to wax paper (nonpolar). It rolls right off.


Do now4

Do Now

  • Explain how to make water not form a drop on a piece of wax. Explain what happens on the molecular level.


Objectives2

Objectives

  • 1. SWBAT continue identify, explain, and apply the properties of water and how they apply to water lab using the water lab.

  • 2. SWBAT define hydrophillic, hydrophobic, capillary action, and specific heat and apply it to how water is essential to keeping organisms alive using questioning and the chapter 2 powerpoint.

  • 3. SWBAT answer questions on the properties of water using chapter 2 worksheet.


Capillary action water climbs up small spaces

Capillary action: water climbs up small spaces

  • Because water has both adhesive and cohesive properties, capillary actionis present.

  • Capillary Action= water’s adhesive property is the cause of capillary action. Water is attracted to some other material and then through cohesion, other water molecules move too as a result of the original adhesion.

  • Ex: Think water in a straw

  • Ex: Water moves through trees this way


Adhesion to glass and cohesion of water to water

Adhesion to glass and cohesion of water to water


Hydrophobic and hydrophilic

Hydrophobic and hydrophilic

  • -Oil is hydrophobic meaning it does not mix with water.

  • -Oil is nonpolar and has no hydrogen bonds

  • -Water is polarand hydrophilic.

  • - Remember: Like dissolves Like!

Food coloring in water

Oil in water


Amphipathic

Amphipathic


Water is the universal solvent

Water is the Universal Solvent

  • Solute: substance that is dissolved

  • Solvent: agent that does the dissolving

  • Solution: Solute dissolved in solvent

  • Properties of water that make it an excellent solvent:

  • -water is polar and can dissolve polar and ionic molecules


Video

Video


Specific heat of water

Specific Heat of Water

  • -Due to hydrogen bonds, water has a better ability to resist temperature change as compared to other substances

  • -Energy (Heat) must be absorbed to break hydrogen bonds

  • -Energy is released when hydrogen bonds are formed

  • Video

  • Relation to Biology:

  • -How does this relate to biology?


Specific heat life

Specific Heat& Life

  • Relation to Biology:

  • -Large bodies of water have a fairly constant temperature compared to the atmosphere

  • -Keeps the water within limits to supply life!

  • -Your body is made of 66% water… homeostasis

  • -Coastal areas generally have milder climates

  • -Large water (oceans) bodies can absorb and release heat

  • -Heat is absorbed from the sun during warmer times and released

  • during cooler times to warm the air


Water density

Water Density

  • -Ice is less dense than water

  • -Water vapor is less dense then water

  • Relation to Biology:

  • -If ice sank, then lakes

  • and rivers would freeze

  • -Killing the aquatic life


Water pollution

Water Pollution

  • Why is water important in biology?

  • https://www.youtube.com/watch?v=fxZ4IMpM45Y


Oil sheen

Oil Sheen

  • -Oil Sheen on water

  • -Oil on top of water in a thin layer

  • Pollution: How doe we get rid of it?


How to get rid of oil on water

How to get rid of oil on water

  • -Detergent breaks up oil into small drops

  • -Detergents are amphipathic

  • have both polar and

  • nonpolar regions


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