October 18, 2010
Obj: Understand water’s unique chemical properties.
Warm-Up: Why is water a polar molecule? (Answer this in your notebook.)
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Essential Question: What are the similarities and differences of living and non-living things?
Ch2.2 Properties of water
Polar
A molecule in which the charges are unevenly
distributed
.
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Essential Question: What are the similarities and differences of living and non-living things?
Ch2.2 Properties of water
Polar
A molecule in which the charges are unevenly distributed
Water (H20) is a polar molecule. This is
because oxygen has 8 protons and has a
stronger attraction for electrons than
hydrogen (1 proton).
.
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Essential Question: What are the similarities and differences of living and non-living things?
Ch2.2 Properties of water
Polar
A molecule in which the charges are unevenly distributed
Water (H20) is a polar molecule. This is because oxygen has 8
protons and has a stronger attraction for electrons than
hydrogen (1 proton).
*Because
of the partial
positive and negative charges, polar
molecules like water can attract each
other.
.
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Essential Question: What are the similarities and differences of living and non-living things?
Ch2.2 Properties of water
Polar
A molecule in which the charges are unevenly distributed
Water (H20) is a polar molecule. This is because oxygen has 8
protons and has a stronger attraction for electrons than
hydrogen (1 proton).
*Because of the partial positive
and negative charges, polar
molecules like water can attract
each other.
.
Hydrogen bond
The attraction between a hydrogen atom on
one water molecule and the oxygen atom
on another.
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Essential Question: What are the similarities and differences of living and non-living things?
Ch2.2 Properties of water
Polar
A molecule in which the charges are unevenly distributed
Water (H20) is a polar molecule. This is because oxygen has 8
protons and has a stronger attraction for electrons than
hydrogen (1 proton).
*Because of the partial positive
and negative charges, polar
molecules like water can attract
each other.
.
Hydrogen bond
The attraction between a hydrogen atom on one water molecule and
the oxygen atom on another.
**Because water is polar, it is able to form multiple
hydrogen bonds, which account for many of water
special properties
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Cohesion
An attraction between molecules of the same
substance
•
Water is very cohesive, because a single water molecule may be
involved in as many as 4 hydrogen bonds at once.
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Cohesion
An attraction between molecules of the same substance
• Water is very cohesive, because a single
water molecule may be involved in as
many as 4 hydrogen bonds at once.
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Cohesion
An attraction between molecules of the same substance
• Water is very cohesive, because a single water molecule may be
involved in as many as 4 hydrogen bonds at once.
Surface tension
Since molecules on the surface do not have
atoms above them, they exhibit stronger
forces with their nearest neighbors on the
surface.
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Cohesion
Surface tension
An attraction between molecules of the same substance
• Water is very cohesive, because a single water molecule may be
involved in as many as 4 hydrogen bonds at once.
Since molecules on the surface do not have atoms above them, they
exhibit stronger forces with their nearest neighbors on the
surface.
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Cohesion
Surface tension
Adhesion
An attraction between molecules of the same substance
• Water is very cohesive, because a single water molecule may be
involved in as many as 4 hydrogen bonds at once.
Since molecules on the surface do not have atoms above them, they
exhibit stronger forces with their nearest neighbors on the
surface.
An attraction between molecules of different
substances.
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• Mixture
• Material composed of 2 or more elements
or compounds that can be separated by
physical means.
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•
Mixture
•
2 types
•
Material composed of 2 or more elements or compounds that
can be separated by physical means.
– 1) solution • Mixture where all components are
evenly distributed throughout
– Ex. Salt water
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•
Mixture
•
Material composed of 2 or more elements or compounds that
can be separated by physical means
•
2 types
– 1) solution
•
Mixture where all components are evenly distributed
throughout
– Ex. Salt water
• Solute
• The substance that is dissolved
– Ex. Salt
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•
Mixture
•
Material composed of 2 or more elements or compounds that
can be separated by physical means.
•
2 types
– 1) solution
•
Mixture where all components are evenly distributed
throughout
– Ex. Salt water
•
The substance that is dissolved
– Ex. Salt
• Solute
• Solvent • Substance in which solute dissolves
– Ex. Water
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•
Mixture
•
Material composed of 2 or more elements or compounds that
can be separated by physical means.
•
2 types
– 1) solution
•
Mixture where all components are evenly distributed
throughout
– Ex. Salt water
•
The substance that is dissolved
– Ex. Salt
•
Substance in which solute dissolves
– Ex. Water
• Solute
• Solvent
– 2)
suspension
• Mixtures of water and non dissolved materials
– Ex. Blood
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•
Mixture
•
Material composed of 2 or more elements or compounds that can be
separated by physical means.
•
2 types
– 1) solution
•
Mixture where all components are evenly distributed throughout
– Ex. Salt water
•
The substance that is dissolved
– Ex. Salt
•
Substance in which solute dissolves
– Ex. Water
•
Mixtures of water and non dissolved materials
– Ex. Blood
• Solute
• Solvent
–
2) suspension
• pH scale
• System of measurement which indicates the
concentration of hydrogen ions in a solution.
Ranges from 0-14, lower numbers have more
hydrogen ions (acidic), while higher numbers have
more hydroxide ions (basic).
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October 19/20, 2010
Obj: Understand how enzymes relate to body function.
Warm-Up: What do enzymes do? (Answer this in your notebook.)
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Enzyme Notes
Activation Energy
Energy needed to get a reaction started.
Catalyst
A substance that speeds up the rate of a chemical
reaction.
Enzymes
A protein that speeds up chemical reactions in the cell
by lowering activation energy.
Substrate
The things that bind to the substrate that cause the
reaction.
Active Site
Lock and Key
Theory
The place on the protein where the substrate binds
Substrates fit into an enzyme’s active site like a lock
and a key.
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Types of Reactions
Endothermic
Reactions
Energy absorbing. Builds molecules.
Exothermic
Reactions
Energy releasing. Breakdown molecules and release
energy. Our peroxidase enzyme that we will be
looking at today is this type of reaction.
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Enzymes lower Activation Energy
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October 22, 2010
Obj: 1. Finish enzyme lab write up.
2. Complete Chapter 2 review on p56-57: #1-32 all
Warm-Up: Finish your temperature vs displacement rate graph.
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October 28, 2010
Obj: Build a Word Map
Use the key vocabulary terms to create a word map.
1. Get a book!
2. Each person choose a different section from chapter 2. See page 55.
2.1 Nature of Matter, 2.2Prop. of Water, 2.3Carbon Compounds,
2.4 Chem Rxns
3. Write the vocabulary words from your section.
4. Draw arrows connecting words that are related within your section.
5. Write on the arrows how they are related.
6. Define any words that you aren’t 100% sure of by looking them up in the book
and writing the definition on the page.
7. Draw pictures to help define words.
8. After you have all your definitions for your words, start drawing arrows from
your words to words in other sections on your same sheet. Make sure each arrow
explains how the words are related.
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