validity and reliability
test wise-ness
word
Tuesday, December 8, 2009
The Water We Drink
Purpose:
Objectives:
Extra resources:
A Biography of water
To drink or not to drink bottled water
dehydration
Although this assignment was designed to have us do a presentation that would take one class period, this will take several class periods, unless one had about a 130 minute block period then it would be one.
I will outline my lesson using the powerpoint as a guide...
Page 2- intro questions
-students get into small groups 2-4 depending on personal preference or class dynamics
-notes on discussion should be made in science journals, Why do all living things love/need water?
-after 2-4 minutes have students share in a class discussion what they came up with in groups... write on white board (I will refer to this process from here on out as pair and share)
-water taste test, have students do a blind taste test of bottled, tap, and filtered water (outlined on page 195 of text)
-pair and share
page 3- terms
- have students write down key terms from page 3 of the powerpoint
page4- global water distribution
-have students view the pie chart, class discussion
- discussion questions: Is most water on planet earth potable, why or why not? Where is most freshwater found? How much of the fresh water is actually is accessible? Of the accessable water what can we actually drink?
-encourage students to come up with questions as well for discussion....
*at this point we have established what we need to know before we move on to details*
page 5- terms
-have students write down key terms from page 5 of the powerpoint
- minerals at this point do a DEMO-
Demo extracting copper from copper sulfate, similarities and differences of this method and mining methods
page 6- pile of plastic water bottles
- have students view the pile of plastic water bottles, class discussion
-discussion questions: How are water bottles made, plastic? Where do they go? Landfill? Recycling? Where can we recycle here?
-encourage students to come up with questions as well for discussion....
page7- alternatives to bottled water
- Pose the question and pair and share...
page 8- what about water makes it so essential
- group discussion, hopefully key ideas come up
- some direction might be needed, why do sidewalks crack around here? is water sticky? etc...
- explain image of frozen water
-click link attached to polarity...animation and tutorial will run through polarity of different molecules and introduce the idea
page 9- terms and demo on molarity
-have students write down key terms from page 9 of the powerpoint
-as students are writing down terms grab materials to prepare .5 L of 1 M HCl solution
- explain what is happening as I prepare a half liter of 1M hydrochloric acid solution
Page 10- electronegativity
- class discussion
Why are the atoms on the right side of the periodic table more electronegative than those on left? Identify the trend? electron shielding, effective nuclear charge, oxidation states, ionization energy
Bend water with a comb and a balloon demo
Static electricity does more than shock you when you go to open a door, or attract dust and pet hair to your furniture and clothes. It can actually bend a stream of water. This is a good science demonstration for kids because it shows how an electrically charged object attracts some things with a neutral charge.
page 11- polarity
- refer back to animation used for slide 8
page 12- discussion about characteristics of water that make it a great coolant for us
-specific heat
page 13- forces
-discuss forces in water molecules
lab:
can be found at this link
- an understanding of how important water is to life on this planet, for us, and for the physical world around us.
Objectives:
- Describe the desirable properties of drinking water
- Explain some of the reasons why bottled water is so popular
- recognize the sources and distribution of water
- describe the factors involved in providing pure drinking water
- Discuss why water is such an excellent solvent for some ionic and some covalent compounds
- Use concentration units: percent, ppm, ppb, and molarity
- Discuss the relationship between the properties of water and its molecular structure
- describe the specific heat of water and compare it with that of other substances
- Understand how electronegativity and bond polarity are related to the structure of water
- describe hydrogen bonding and its importance to the properties of water
- describe how the densities of ice and water are related to the structure of the water molecule
Extra resources:
A Biography of water
To drink or not to drink bottled water
dehydration
Although this assignment was designed to have us do a presentation that would take one class period, this will take several class periods, unless one had about a 130 minute block period then it would be one.
I will outline my lesson using the powerpoint as a guide...
Page 2- intro questions
-students get into small groups 2-4 depending on personal preference or class dynamics
-notes on discussion should be made in science journals, Why do all living things love/need water?
-after 2-4 minutes have students share in a class discussion what they came up with in groups... write on white board (I will refer to this process from here on out as pair and share)
-water taste test, have students do a blind taste test of bottled, tap, and filtered water (outlined on page 195 of text)
-pair and share
page 3- terms
- have students write down key terms from page 3 of the powerpoint
page4- global water distribution
-have students view the pie chart, class discussion
- discussion questions: Is most water on planet earth potable, why or why not? Where is most freshwater found? How much of the fresh water is actually is accessible? Of the accessable water what can we actually drink?
-encourage students to come up with questions as well for discussion....
*at this point we have established what we need to know before we move on to details*
page 5- terms
-have students write down key terms from page 5 of the powerpoint
- minerals at this point do a DEMO-
Demo extracting copper from copper sulfate, similarities and differences of this method and mining methods
Materials:
Beaker
Copper II Sulfate powder
NaCl
Aluminum foil
Distilled H2O
In the beaker mix a spoonful of copper sulfate into a 400 mL beaker with approximately 250 mL of distilled H2O.
Then mix in a spoonful of NaCl
Then loosly crumple a 20cm by 20 cm square piece of foil and place it into the solution
Within minutes copper will form on the outside of the aluminum foil ball
page 6- pile of plastic water bottles
- have students view the pile of plastic water bottles, class discussion
-discussion questions: How are water bottles made, plastic? Where do they go? Landfill? Recycling? Where can we recycle here?
-encourage students to come up with questions as well for discussion....
page7- alternatives to bottled water
- Pose the question and pair and share...
page 8- what about water makes it so essential
- group discussion, hopefully key ideas come up
- some direction might be needed, why do sidewalks crack around here? is water sticky? etc...
- explain image of frozen water
-click link attached to polarity...animation and tutorial will run through polarity of different molecules and introduce the idea
page 9- terms and demo on molarity
-have students write down key terms from page 9 of the powerpoint
-as students are writing down terms grab materials to prepare .5 L of 1 M HCl solution
- explain what is happening as I prepare a half liter of 1M hydrochloric acid solution
Page 10- electronegativity
- class discussion
Why are the atoms on the right side of the periodic table more electronegative than those on left? Identify the trend? electron shielding, effective nuclear charge, oxidation states, ionization energy
Bend water with a comb and a balloon demo
Static electricity does more than shock you when you go to open a door, or attract dust and pet hair to your furniture and clothes. It can actually bend a stream of water. This is a good science demonstration for kids because it shows how an electrically charged object attracts some things with a neutral charge.
Steps
Take a dry (preferably nylon) comb and run it through your hair about 10 times. Your hair must be dry as well.
Take a plastic spoon or a balloon and rub it vigorously against nylon, acrylic, or fur.
1 Charge an object. What you're doing here is collecting electrons on the object. Electrons give the object a negative charge.
2 Turn on your faucet. Only let a very thin stream of water flow. It needs to be a smooth stream, not one that breaks up.
3 Place the object right next to the stream of water without touching it. If you are doing it correctly, you can see the water moving towards the object.
page 11- polarity
- refer back to animation used for slide 8
page 12- discussion about characteristics of water that make it a great coolant for us
-specific heat
page 13- forces
-discuss forces in water molecules
lab:
can be found at this link
Subscribe to:
Posts (Atom)