Water

Water

Warm-up: Label the Phase diagram

Water

• H2O

• Hydrogen and Oxygen are covalently bonded

• Polar Molecule

• Bent angle contributes to its properties

Hydrogen Bond

• Hydrogen to oxygen- covalent

• H2O to H2O- hydrogen bond

• Hydrogen bonds are really just strong attractive forces

• Occur because water is a dipole or simply a polar molecule

Crystal Structure

• Water behave regularly to 4 degrees C

• Between 4-0 this is where bonds form

• Forms a crystal structure

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Open Ended

Why is ice less dense than water? Explain your reasoning.

Density

• The crystal structure of ice pushes molecules further from each other

• This makes ice float

• Density of water at 0 C is .99984 g/cm³

• Ice at 0 C is .917 g/cm³

Other Properties

• High Specific Heat Capacity ( how much heat to change 1 kg 1 degree C)

• Naturally Occuring

• Solvent(dissolves things, like salt)

• Reactant- important in many processes

Project- Presentation

• 1. In your groups research and choose 1 property of water

• 2. Write a hypothesis about what would happen if that particularly property changed, even if very slight

• 3. Brainstrom ways this property would change how life would exist

• 4. Create a short 3-4 minute presentation of how life would change because of this.

• 5. Presenting to the class tomorrow- 3/25