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

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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

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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

pH

Play this game!

-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!