learning targets “i can…” -draw a water molecule and label the atoms and their partial...
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Learning Targets“I Can…”
-Draw a water molecule and label the atoms and their partial charges.
-Distinguish between adhesion and cohesion.
-Define “polarity.”
-Observe that molecules are in a constant state of motion because they have energy.
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CHEMISTRY
A Brief Summary
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All living things are composed of chemicals. What makes up chemicals?
1. Atomsa. Protons (+)
b. Neutrons (Neutral)
c. Electrons (-)
d. Both protons and neutrons are found in the nucleus. The number of protons is the atomic number.
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All living things are composed of chemicals. What makes up chemicals?
2. Elements: substance that contains one kind of atom
Important elements in biology . . .
C H O P K N S Ca Fe Mg
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All living things are composed of chemicals. What makes up chemicals?
3. Molecules: chemical units resulting from the combination of elements
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What do cells need to survive?
1. Inorganic chemicals; the most important is WATER!
a. Water is found in our cells and surrounding our cells.
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What do cells need to survive?
1. Inorganic chemicals; the most important is WATER!
b. Water is polar because atoms are shared unevenly.
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What do cells need to survive?
c. Water forms hydrogen bonds
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What do cells need to survive?
d. Polar molecules are attracted to other polar molecules
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What do cells need to survive?
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2. Organic chemicals
a. All contain carbon
What do cells need to survive?
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What do cells need to survive?b. They are also called macromolecules because they are so large.
i. Carbohydrates (polar)
ii. Lipids (nonpolar)
iii. Proteins
iv. Nucleic Acids
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References
• http://www.sp.uconn.edu/~terry/images/mols/atomfig5.html
• http://encarta.msn.com/media_461556496_761567432_-1_1/water_molecule.html
• http://www.youtube.com/watch?v=CT4pURpXkbY