Solutions. solute solvent substance being dissolved substance in which solute is dissolved “VATER”
Monday Nov 17 th -Week 15 TOPIC : Water and Solutions OBJ : 9-11 DO NOW : EXT : DUE DATE : DW:...
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Transcript of Monday Nov 17 th -Week 15 TOPIC : Water and Solutions OBJ : 9-11 DO NOW : EXT : DUE DATE : DW:...
Monday Nov 17th-Week 15TOPIC: Water and Solutions OBJ : 9-11
DO NOW:
EXT: DUE DATE:
DW: Solute Worksheet
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EXIT: Fill in your level of understanding DISTINGUISH between solutions and suspensions.
HANDOUTS to PICK-UP:-6.3 Notes-6.3 Solute/Solvent Handout
SEMINAR 2:-Quiz for 6.1 & 6.2
BEFORE/AFTER SCHOOL:DW-None
-Objectives Check-Binder Organization-6.3 Notes-Worksheet
Draw a water molecule. Show all bonds using Bohr Models
AG
EN
DA
AB
SEN
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Science of Life
Monday: ___11__/__17___ OBJECTIVE…#_9-11_____ TOPIC:
Water and Solutions
Daily Work Grade- None
DW GRADE: 2 1 0
MondayDO NOW
•Q: Draw a water molecule. Show all bonds using Bohr Models
•A:
Today’s Objectives9--- IDENTIFY how the properties of water make it well suited to help maintain homeostasis in an organism 10---DETERMINE pH of various substances and DESCRIBE the use of the pH scale 11---COMPARE / CONTRAST acids and bases and DESCRIBE how buffers affect cells.
Vocabulary
These should be done by test day!
-polar molecule / nonpolar molecule-hydrogen bond-acid / base-pH / buffer
-adhesion / cohesionH
6.3 WATER & SOLUTIONSWHAT YOU WILL LEARN
-about properties of water
-water’s polarity
-how acids differ from bases
rev- homeostasisMAIN IDEA:Properties of water help organisms maintain homeostasis
-water vital to life on earth
-properties
-provide environments suitable for life
-help maintain homeostasis
-book pic P162
-UNIVERSAL SOLVENT: separate the ions
-many substances dissolve in water
-ADHESIVE: attraction with other surfaces
-COHESIVE: attracted to each other [hold liquid together]
-POLAR: slight (+) / slight (-)
Visualizing Properties of Water
WATER’s PROPERTIES
HUMANS-
-survive days w/o food
-only few days w/o water
POLARITY:
-property of having 2 OPPOSITE poles/ends
IDENTIFY type of bond:_______________ /how many bonds:_____
WATER’s POLARITY
DRAW a lewis structure of 2 HYDROGEN and OXYGEN atoms
OH H
COVALENT 2
NONPOLAR-
equal distribution e-
among atomsARR
WATER’s POLARITY
1-__________________________
2-__________________________
3-__________________________
4-__________________________
How many water molecules shown?______
HYDROGEN BOND:-weak interaction involving H ( flourine, oxygen, nitrogen)
O: negative end (-)
H: positive end (+)
hydrogen bond
covalent bond
5
REASONS-electrons more strongly attracted to O nucleus than H nucleus-causes bent shape
EFFECTS-form bonds with other polar molecules-readily form solutions
WATER’s POLARITY/ reasons/effects
What is a mixture?
-A combination of 2 or more substances
-Each retains individual characteristics or properties
ex: tossed salad, mixed bag of M&Ms, Salt Water
2 Different Types:
Homogenous-uniform composition throughout
ex: crystal light
Heterogenous-components remain distinct
ex: Salad
MIXTURES w/ WATER solution
SOLUTION-
-another name for HOMOgenous mixture
SOLVENT-
-SUBSTANCE in which ANOTHER is DISSOLVED
SOLUTE-
-SUBSTANCE that IS DISSOLVED
IDENTIFY the property of water that makes it a good SOLVENT-
-POLARITY
MIXTURES w/ WATER solution
DEMO
ACIDS
-increase in hydrogen ions
-a solution that has an excess of H+ ions
HYDROGEN IONS-
-positively charged ion of hydrogen H+
BASES-decrease in hydrogen ions
-a solutions that has an excess of OH- ions
HYDROXYL IONS-
-negatively charged ion of hydroxide OH-
ACIDS/BASES/pH
Acids & Bases Examples
ACIDS/BASES/pH
WATER
release MANY H+
release FEW H+
release FEW OH-
release MANY OH-
pH- “power of the hydrogen ion”
-ion: charged atom or molecule
IDENTIFY what the pH scale measures-
-how acidic / basic substance is-substances INCREASE / DECREASE # H+
ACIDIC NEUTRAL BASIC
ACIDS/BASES/pH
0 7 14
-solution which RESIST changes in pH when small quantities of an acid or alkali added to it.
-keep pH "in range": 6.5 - 7.5
-Organisms SURVIVE and FUNCTION despite metabolic activities that shift pH (acid/basic end of scale)
DISCUSS/IDENTIFY the importance of buffers in biology.
-bring organism back to balanceHOMEOSTASIS
BUFFERS
1- IDENTIFY the independent variable.
-pH/temp
2- IDENTIFY the dependent variable.
-protease activity
3- IDENTIFY the range of pH values used in the experiment.
-pH range 5-12
4- IDENTIFY the range of temperatures used in the experiment.
-temp range 30-90C
DATA ANALYSIS
5- SUMMARIZE the results of the two graphs.
-highest activity pH10 / 60C
6- INFER/SUPPORT- if laundry detergent is basic and requires hot water to be most effective, would this protease be useful?
Yes, because the enzyme had the highest activity at a high pH (basic) and at a high temp.
DATA ANALYSIS
EXITFILL-IN: level of understanding of today’s objective
EXIT: Describe a chemical reaction (in detail) that happens everyday!