Friday 30 September Take out a half sheet of paper and a pen/pencil for the quiz Once done with quiz, pick up your Molecules of Life activity sheet you.

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Presentation transcript:

Friday 30 September Take out a half sheet of paper and a pen/pencil for the quiz Once done with quiz, pick up your Molecules of Life activity sheet you started on Wednesday and complete it Get out your notes for notes on water!

What are some things you already know about water? Properties of Water!!! What are some things you already know about water?

Properties of water H2O Exhibits cohesion Also exhibits adhesion 2 hydrogen atoms and 1 oxygen atom attached through a special type of covalent bond called a hydrogen bond What is an H-bond? Glad you asked!! http://www.youtube.com/watch?v=lkl5cbfqFRM Exhibits cohesion when molecules of the same substance attract This is why water forms drops Also exhibits adhesion When molecules of different substance attract Why you see a dip in the graduated cylinder

POLARITY A water molecule is polar because there is an uneven distribution of electrons between the oxygen and hydrogen atoms

What do we know so far….? Take one minute to summarize your notes What have you learned about water? What further questions do you have?

Properties of water Has a pH of 7 pH is a scale which determine how acidic or basic a substance is. Below 7 = acid ABBA !!! Above 7 = base pH indicates the amount of Hydrogen ions in a solution

pH Scale

Water is so incredibly amazing Water is so incredibly amazing. Do you have any idea how awesome water is? http://player.discoveryeducation.com/index.cfm?guidAssetId=28AC1CDC-7403-46E0-9AF1-2B6F607D35F0&blnFromSearch=1&productcode=US

Homework tonight Read pages 40-43 Do problems 1-5 on page 43