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Properties of Water

Properties of Water. FS Unit 5 FCS-FS-5: Students will discuss why water and pH are important factors in food preparation and preservation. A. Explain the properties of water. Properties of Water . Chemical Description of Water

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Properties of Water

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  1. Properties of Water FS Unit 5 FCS-FS-5: Students will discuss why water and pH are important factors in food preparation and preservation. A. Explain the properties of water.

  2. Properties of Water • Chemical Description of Water - One atom of oxygen bound to two atoms of hydrogen make up water. • Polarity – uneven distribution of charge • Because the hydrogen atoms are attached to one side (positive charge) and the oxygen atom is on the other side (negative charge)

  3. Properties of Water • Adhesion – the attraction of the water molecules to other materials. (Water’s attraction to materials other than itself ) LET’S TRY IT

  4. Properties of Water • Cohesion – attraction between water molecules. (Water’s attraction to itself ) • This is why water is kind of “sticky” • With the molecules attracting to each other they tend to clump together. That’s why they are drops. • If it wasn’t for earth’s forces like gravity a drop of water would be a perfect SPHERE. LET’S TRY IT

  5. Properties of Water • Capillary Action – water molecules being attracted to molecules of other materials as well as themselves. • Adhesion and Cohesion are working together WATCH IT IN ACTION

  6. Properties of Water • Surface Tension – a tension is created at the surface as the water molecules at the surface are pulled into the body of water. • Acts as the water’s skins • Is strong and can support a paper clip or needle LET’S TRY IT

  7. Properties of Water • In the cleaning process you have to reduce surface tension so that water can spread and wet the surface. • Chemicals called surface active agents or Surfactants - make a surface “wetter”. • Surfactants functions can also loosen, disperse water and hold soil in suspension until it can be rinsed. • Surfactants can provide alkalinity whichcan remove acidic soils.

  8. Properties of Water • Water is the “Universal Solvent”. • It dissolves more substance than any other liquid • Wherever water goes (through the ground or our body) it takes along valuable chemicals, minerals and nutrients.

  9. Properties of Water • Water is the only natural substance that is found in all states • Liquid • Solid (ice) • Gas (steam) • Water Freezes at 32 degrees Fahrenheit • Water Boils at 212 degrees Fahrenheit

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