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Water’s Unique Properties. What is the structure of water?. Water is a compound that contains two hydrogen atoms (+) and one oxygen atom (-). Due to the electrical charges water is known as a polar molecule. Chemical formula is H 2 O. Looks like Mickey Mouse. Turn and Talk

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what is the structure of water
What is the structure of water?
  • Water is a compound that contains two hydrogen atoms (+) and one oxygen atom (-). Due to the electrical charges water is known as a polar molecule. Chemical formula is H2O.
  • Looks like Mickey Mouse.
slide3

Turn and Talk

  • You will partner with your neighbor. When I say go, partner A will discuss his/her understanding of the question while partner B listens. When I call time, partner B will share his/her understanding of the question and partner A will listen.
    • Topic:
      • Why does ice float?
      • How does ice floating in water relate to the properties of water?
      • What property of water is being discussed? How would our world be different without this property?
what are the unique properties of water
What are the unique properties of water?
  • Universal Solvent
  • Capillary Action
  • Adhesion
  • Buoyancy
  • Surface Tension
  • Polarity
  • Cohesion
  • Density
how is water a universal solvent
How is water a universal solvent?

Answer: Water has the ability to dissolve most substances.

Definition:

  • Universal Solvent: Water’s unique property to dissolve most substances.

Teacher Guided Lab: “Water, the Universal Solvent”

Real-World Examples:

    • Salt and water - Instant pancake mix
    • Kool-aid - Alka-seltzer

Question (copy): How would our lives be different if water could not dissolve most substances?

Frayer Model: Think-Pair-Share

is water polar or nonpolar
Is water polar or nonpolar?

Answer: Water is a polar molecule. It contains a positive and negative charge.

Definition:

  • Water’s property to have an even distribution of charge across the molecule.

Background Info:

  • Polar molecule mix with polar molecule. (saltwater)
  • Polar and nonpolar do not mix. ( oil and water)
  • Nonpolar mix with nonpolar. (milk and chocolate

syrup)

Teacher Guided Lab: “Polar Pals”

Quesion (Copy): How would our food look different if water was not a polar molecule?

Frayer Model: Think-Pair-Shar

why do belly flops hurt
Why do belly flops hurt?

Answer: When entering a swimming pool your body is breaking the water’s surface tension.

Definition:

  • The force that acts on the particles in water that allow it to become tight.

Background Info:

  • The force that allows water to become tight is cohesion.
    • Cohesion: The attractive force between water molecules.

Teacher Guided Lab: Sinkin’ Lincoln

Question: How would the landscape of Earth be different if water molecules did not have cohesion and vaporized at room temperature?

Frayer Models: (Surface Tension, Cohesion) Think-Pair-Share

how do cruise ships float if they are so big
How do cruise ships float if they are so big?

Answer: Cruise ships are able to float because of the upward force of buoyancy and the boats shape.

Definition:

- Buoyancy: The ability of a water to exert an upward force on an object that is immersed.

Background Info.:

  • Density of water is 1.0 g/ml
  • Salt and depth increase buoyant

force.

Real-World Examples:

  • Salt Lake Utah
  • Ice floating in water

Teacher Guided Lab: “Passengers in a Boat”

Question: Why can anyone float in the

Great Salt Lake in Utah?

Frayer Model: Think-Pair- Share

bowling ball sink or float why
Bowling ball. Sink or float? Why?

Answer: A bowling ball would sink in water because it is more dense than the water.

Definition:

Density: The measure of mass of a substance in a given volume.

Background Info.:

  • Density of water= 1.0 g/ml

Teacher Guided Lab: “A Density Column”

Frayer Model: Think-Pair-Share

how do plant roots get their water from the soil
How do plant roots get their water from the soil?

Answer: Plants roots rely on water’s property of capillary action.

Definition:

Capillary Action: The process that moves water through a narrow porous space.

Real-World Ex.

  • Water and celery stick (picture)
  • Roots and soil water
  • Paper towel and spills

Teacher Guided Lab:

- Capillary Action

Frayer Model: Think-Pair -Share

why does a suction cup stick better when you put water on it
Why does a suction cup stick better when you put water on it?

Answer: Suction cups use water’s property of adhesion to stick to surfaces better.

Definition:

Adhesion: The tendency of water to stick to other substances.

Real-World Examples:

  • Suction cup on a window
  • Rain on a rain jacket

Teacher Guided Lab: Go with the Flow

Frayer Model: Adhesion