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PoCo loco water!
PoCo loco water!
Water is a crazy (loco) substance. It is the only known substance on earth that exists naturally in all three states of matter...liquid, solid, and gas. It also expands when it freezes, making the solid (ice) less dense than the liquid (water). Most substances contract when they freeze and become more dense, but not water!
Water is a crazy (loco) substance. It is the only known substance on earth that exists naturally in all three states of matter...liquid, solid, and gas. It also expands when it freezes, making the solid (ice) less dense than the liquid (water). Most substances contract when they freeze and become more dense, but not water!
Remember tug of war demonstration of 'polar.'
Remember tug of war demonstration of 'polar.'
Remember "shared" treat demo.
Remember "shared" treat demo.
Prove that water is made with covalent bonds.
Prove that water is made with covalent bonds.
Are electrons stolen or shared?
Are electrons stolen or shared?
Be able to explain why water is polar and covalent. Label the drawing appropriately.
Be able to explain why water is polar and covalent. Label the drawing appropriately.
Polar = opposite - water has a region of slightly positive charge and a region of slightly negative charge.
Polar = opposite - water has a region of slightly positive charge and a region of slightly negative charge.
Covalent = shared electrons - oxygen and hydrogen share electrons, making covalent bonds. Keep in mind that they don't share evenly, thus making water a polar molecule with covalent bonds.
Covalent = shared electrons - oxygen and hydrogen share electrons, making covalent bonds. Keep in mind that they don't share evenly, thus making water a polar molecule with covalent bonds.
Do this!
Do this!
Draw a water molecule in your science notebook. Write a sentence proving that it is polar and then write a sentence proving that it is covalent. Draw a line from your sentences to the part of the diagram that shows proof for your sentences.
Draw a water molecule in your science notebook. Write a sentence proving that it is polar and then write a sentence proving that it is covalent. Draw a line from your sentences to the part of the diagram that shows proof for your sentences.
Show this to a teacher before moving on to the lab.
Show this to a teacher before moving on to the lab.
BIO.2 The student will investigate and understand that chemical and biochemical processes are essential for life. Key ideas include
water chemistry has an influence on life processes;
macromolecules have roles in maintaining life processes;
enzymes have a role in biochemical processes;
protein synthesis is the process of forming proteins which influences inheritance and evolution; and
the processes of photosynthesis and respiration include the capture, storage, transformation, and flow of energy.
Water has chemical and physical properties that facilitate metabolic activities in living cells. Water is a solvent and dissolves chemicals, minerals, and nutrients that are used to support life processes. The polarity of water molecules causes them to be strongly attracted to one another and gives rise to surface tension and cohesion. Water is also a thermal regulator in living systems (BIO.2 a).
In order to meet this standard, it is expected that students will:
relate the chemical and physical properties of water that contribute to metabolism (BIO.2 a)
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