I. Grade Level/Unit Number: 8Th Grade / Unit 3

I. Grade Level/Unit Number: 8th Grade / Unit 3

II:Unit Title: Amazing Water

III.Unit Length:3-4 weeks

IV.Major Learning Outcomes: The student will be able to . . .

Predict the solubility of a substance in water based on polarity.
Explain water’s unique ability as the universal solvent.
Predict whether a substance will float in water based on density.
Classify an object based on its density relative to that of water.
Determine if water is demonstrating cohesive or adhesive forces.
Analyze real-world situations that involve density and buoyancy.
Explain the unusual nature of ice’s density versus water’s density.
Describe the location of water on earth.
Understand that the water on earth is the same water that has been here for billions of years.
Explain the processes by which water moves from one location to another via the water cycle (processes include transpiration, condensation, runoff, groundwater, and evaporation).
Describe, based on percentages, the amounts of water in each location.
Describe types of technology or processes that can be used to convert unusable water to usable resources.
Understand that water is a limited resource that needs to be conserved.
Describe the structure of the hydrosphere including watersheds, river basins, standing bodies of water (lakes and ponds), rivers and streams, wetlands, and the ocean.
Describe technology used to study the hydrosphere.

V.Content Objectives Included:

Number / Competency or Objective / RBT Tag
3.01 / Analyze the unique properties of water including:

Universal solvent.
Cohesion and adhesion.
Polarity.
Density and buoyancy.

Specific heat.

/ B2.3 (classifying)
B4.2 (outlining)
3.02 / Explain the structure of the hydrosphere including:

Water distribution on earth.
Local river basin.
Local water availability.

/ a4.2 (explain)
3.06 / Evaluate technologies and information systems used to monitor the hydrosphere. / c5.2 (evaluate)

VI.English Language Proficiency (ELP) Standard 4 (2008)- for Limited EnglishProficient students (LEP)English language learners communicate information, ideas, and concepts necessary for academic success in the content area of SCIENCE.

VII.Materials / Equipment Needed:

Part I / test tubes
test tube rack
graduated cylinder
beakers (small—50 mL and large—250 mL)
medicine droppers
plastic shoe boxes
balance
water
alcohol (both 70% and 91%)
oil (mineral and canola)
sand
salt
flour
cornstarch
sugar
soap flakes
aluminum foil
pennies
wax paper
paper towels—not brown school paper towels
small hard plastic object
small wooden object
can
tape—masking
fabric samples—cotton, linen, wool, silk, polyester, blend, rayon,
nylon, and chamoise
Part II / chart paper
markers
water cycle clues and signs—provided
graduated cylinders
calculators
calibrated droppers or pipettes(calibrated for 1 mL)
2-liter bottles
food coloring
large paper or poster board
research Materials—encyclopedias, Internet, and textbooks
Part III / white paper
white cardstock
tape
water soluble markers
shallow pans
water bottles
River Basin Booklets from NCDENR (free)
projector or color printer
chart Paper
internet Access with projector or individual student access

VIII. Big Ideas (from Support Document):

Water is one of the most common substances on Earth. The unique properties of water are polarity, cohesive and adhesive abilities, universal solvency, density and buoyancy, and high specific heat. Water is circulated on Earth by a process known as the water cycle. Most of the Earth’s water is found in the oceans. The majority of fresh water exists in ice caps, glaciers and aquifers. Surface water moves into river basins from areas called watersheds. The availability of water varies with local geography and allows humans to utilize water as a resource.

IX:Unit Notes:

The first part of this unit is packed with labs. The second and third parts focus more on hands-on activities and discussions. The unit moves from water’s unique properties to the location of water on earth to the specific structure of the hydrosphere and the technologies used to monitor the hydrosphere. Students have some background knowledge on the water cycle but may not have background knowledge on the specific “structures” of the hydrosphere.

For the third part, each student will need a copy of the river basin booklet published by NCDENR. These resources are free for educators and can be obtained by ordering them from NCDENR. The booklet is also available online at

You will need to print the satellite images for Part 3: ELABORATE in color.

There are a series of activities available at the following website on the water cycle.

You can find a great resource for water lessons at the following website from the state of Queensland, Australia Department of Natural Resources and Water. There are lessons, background information, experiments, etc.

X. Global Content and 21st Century Skills:

NC SCS

Grade 8

/ 21st Century Skills / Activity
Communication Skills
1.01,1.02, 1.08
6.03, 7.01 / Conveying thought or opinions effectively / Take a Stand Activity
1.05,1.10 / When presenting information, distinguishing between relevant and irrelevant information
1.04 / Explaining a concept to others / Turn and Talk Activity, Frayer Models
Interviewing others or being interviewed
Computer Knowledge
1.09 / Using word-processing and database programs
1.07 / Developing visual aides for presentations / Water Cycle Diagram
Technology Ad
1.08 / Using a computer for communication
2.04 / Learning new software programs
Employability Skills
1.02 / Assuming responsibility for own learning / All Labs and Research
Persisting until job is completed / All Labs and Research
1.03 / Working independently / Research, Frayer Models
7.05 / Developing career interest/goals
1.08 / Responding to criticism or questions
Information-retrieval Skills
1.09
3.06, 5.04, 5.05, 7.05 / Searching for information via the computer / Research for processes that convert unusable water, water witching activity
Technology Ad
1.08
7.05 / Searching for print information / Research for processes that convert unusable water
1.09
2.02, 7.05 / Searching for information using community members
Language Skills - Reading
1.03, 1.05 / Following written directions / All labs
1.05, 3.08
4.08, 4.09, 4.10, 5.02 / Identifying cause and effect relationships / Using remote sensing to study the effects of flooding along NC coast
1.10
6.04 / Summarizing main points after reading / Frayer Models
1.07
1.08 / Locating and choosing appropriate reference materials / Research for processes that convert unusable water
1.10 / Reading for personal learning
Language Skill - Writing
5.02, 7.02 / Using language accurately
1.07
1.08
1.10 / Organizing and relating ideas when writing
1.10 / Proofing and Editing
2.04
7.05 / Synthesizing information from several sources / Research for processes that convert unusable water
1.10 / Documenting sources / Technology Ad
2.03 / Developing an outline
1.05 / Writing to persuade or justify a position / Promoting the processes for converting unusable water
1.09 / Creating memos, letters, other forms of correspondence
Teamwork
1.01
1.05 / Taking initiative
Working on a team / All Labs
Thinking/Problem-Solving Skills
1.02, 4.05,
4.07, 4.08,
5.02, 7.03 / Identifying key problems or questions / Processes for converting unusable water, types of technology to monitor hydrosphere activity
1.05, 1.07,
1.10, 2.03,
4.02 / Evaluating results / All Labs
1.06, 3.01,
3.05, 5.04,
5.05, 6.02
7.03 / Developing strategies to address problems / Researching and developing processes for converting unusable water
1.09 / Developing an action plan or timeline

Unit 3:

Amazing Water

CONTENTS

Part I: The Unique Properties of Water 7

Part II: Distribution of Water 33

Part III: The Structure of the Hydrosphere 50

Multiple Choice Questions 66

Amazing Water

Part 1: The Unique Properties of Water

PURPOSE: To investigate the unique properties of water.

GOAL / OBJECTIVE:

Goal 1 –The learner will design and conduct investigations to demonstrate an understanding of scientific inquiry.

Objectives 1.01, 1.05, 1.08, 1.09, 1.10

Goal 2 - The learner will demonstrate an understanding of technological design.

Objective 2.02, 2.03, 2.04

Goal 3 - The learner will conduct investigations and utilize appropriate technologies and information systems to build an understanding of the hydrosphere.

Objective 3.01

Engage:

Place a couple pieces of ice in a beaker of water. Give students 3-5 minutes to brainstorm on paper why ice floats. Remind the students that almost all pure solids are more dense than their corresponding pure liquids. After allowing students to brainstorm on paper, ask students to “turn and talk” about their ideas.

“Turn and Talk” is a strategy that allows students to partner with one person and share ideas. Give the first partner 1 minute to share his ideas while the second partner listens. Then, allow 1 minute for the second partner to share his ideas.

Next, as a class, come up with an explanation as to why ice floats. Lead students to the idea that water expands when it freezes, thus trapping air. Hence, ice is less dense than water. This is a unique property of water.

Explore:

Students will perform six mini-labs in stations that introduce and reinforce the unique properties of water. Students should record their information on the data sheet and answer the analysis questions. The directions are available in station cards. These labs may take 2-3 days.

Note to Teacher: Be sure to cut the aluminum for Station 4 the same size. You will need to prepare the can for Station 7 using a hammer and nail to punch 2 small holes on the side of the can along bottom edge. The holes should be about one-half inch apart.

Explain:

Have the student complete the Frayer Model (adapted from Frayer, D., Frederick, W.C., and Klausmeier, H.J. (1996). A Schema for Testing the Level of Cognitive Mastery. Madison, WI: WisconsinCenter for Education Research.) for each concept using available resources. The students will give a definition, a visual (sketch) to associate with the term, 3 real-world examples, and a sentence using the concept. You should model the process with the first Frayer Model as a class. A transparency for the first one is provided.

Encourage students to use specific examples from the labs we have conducted or from their own experiences.

*In the end, students should have a clear understanding of each concept and a visual image to allow for recognition.

Concepts:

8th Grade Unit 31

Universal Solvent

Cohesive Forces

Adhesive Forces

Polarity

Density

Buoyancy

Surface Tension

Capillary Action

8th Grade Unit 31

Elaborate:

Tell the students they are working for a textile company to make tents (guys) or handbags (girls). To gather data, they must test known fabrics for water absorbency to see if water adheres to the fabric. Then, they must determine if man-made fibers or synthetic fibers work the best.

Ask the students to complete the activity sheet. They may need to do research to determine if the fibers are natural or man-made.

Evaluate:

Ask the students to identify the property of water from various scenarios. See attached student sheet of scenarios.

Additional Resources

USGS website on water properties

Student Reading and Experiments – WOW Curriculum sponsored by NSF

Background Information on properties of water

Student Reading and Background Information – more detailed

UniquePropertiesofWater.doc

ENGAGE, Part 1

Transparency

Turn and Talk

You will partner with your neighbor. When I say go, partner A will discuss his/her understanding of the question while partner B listens. When I call time, partner B will share his/her understanding of the question and partner A will listen.

EXPLORE, Part 1

Station Directions

EXPLORE, Part 1

Station Directions

EXPLORE, Part 1

EXPLORE, Part 1Name ______

HandoutDate ______

Unique Properties of Water

Station Lab Data Collection and Analysis Sheet

Station 1: Water—The Universal Solvent

Data:

Substance / Prediction / Data on Solubility
Alcohol
Oil
Sand
Salt
Flour
Cornstarch
Sugar
Soap Flakes

Analysis:

Did all of the substances dissolve in water? If no, which substances did not dissolve in water?

Water is a polar molecule. What does this mean?

What can we determine about the polarity of the substances based on the solubility of each substance?

Does water’s polarity help it to act as a universal solvent? Why or why not?

How does water’s ability to be a universal solvent help us in our everyday life?

Station 2: Polar Pals

Data:

Beaker

/ Observations
Beaker 1
Beaker 2
Beaker 3

Analysis:

Which substance was soluble in water? Why?

Which substance was insoluble in water? Why?

Did the liquids in the last beaker mix? Why or why not?

Station 3: Sinkin’ Lincoln

Data:

Substance

/ Prediction of Number of Drops before Overflow / Actual Number of Drops
Before Overflow
Plain Water
Soapy Water

Sketch:

Analysis:

Surface tension is created by forces between molecules. Are the forces cohesive or adhesive? Explain your answer.

What did the soap do to the surface tension of the water? Explain your answer.

How does surface tension explain the pain a swimmer feels when he jumps off the diving board and does a belly buster?

Station 4: Passengers in a Boat

Data:

Measurement / Boat 1 / Boat 2 / Boat 3 / Boat 4 / Boat 5
Number of pennies needed to sink boat
Mass of empty boat
Mass of boat and pennies
Volume of boat
Density of empty boat
Density of boat with pennies

Sketch:

Analysis:

What is buoyancy and how does it relate to this lab?

Does the mass of the boat affect the buoyancy? Why or why not?

How are the concepts of buoyancy and density used to design boats that will float on water?

Station 5: A Density Column

Data:

Object / Observations
Wooden Object
Plastic Object
Aluminum Ball

Sketch:

Analysis:

If water’s density is 1.0 g/mL, what can be determined about the other liquids’ densities in the column?

Rank the densities of the liquids and the solids from most dense to least dense.

Using this information, explain how the Titanic could float on water.

Station 6: Capillary Action

Data:

Beaker

/ Observations
1
2
3

Analysis:

Is capillary action a cohesive or adhesive force? Explain your answer.

Which liquid experienced the greatest capillary action? Explain your answer.

How do plants use capillary action to acquire water?

Station 7: Go With the Flow

Data:

Flow of Water

/ Observations

Initial Flow of Water

Flowing Together
Flowing Separating

Analysis:

Which direction does the water flow when you first take the tape off the bottom of the can?

What causes the attraction of the water to begin flowing together?

What allows the water to continue to flow in one stream?

EXPLAIN, Part 1

Frayer Model Student Sheet 1, 1- 8 Adapted from A Schema for Testing the Level ofCognitive Mastery, WI: WisconsinCenter for Education Research

EXPLAIN, Part 1

Frayer Model Student Sheet 2

EXPLAIN, Part 1

Frayer Model Student Sheet 3

EXPLAIN, Part 1

Frayer Model Student Sheet 4

EXPLAIN, Part 1

Frayer Model Student Sheet 5

EXPLAIN, Part 1

Frayer Model Student Sheet 6

EXPLAIN, Part 1

Frayer Model Student Sheet 7

EXPLAIN, Part 1

Frayer Model Student Sheet 8

EXPLAIN, Part 1

Frayer Model Transparency see adapted note from page 21 of this unit.

ELABORATE, Part 1Name ______

HandoutDate ______

Fabrics and the Properties of Water

Purpose: To investigate the adhesion of water to fabrics and the absorbency of fabrics.

Materials:

Fabric samples listed in data table (Samples should be the same size.)

Balance

Water

Containers

Paper Towels (for cleanup)

Procedure:

Gather materials. Be sure the fabric samples are the same size.
Make observations of each piece of fabric, such as texture, color, and weave. You can use a stereo microscope to examine the weave of the fabric. Record observations in data.
Measure the mass of each piece of dry fabric. Record the mass in the data table.
One at a time, submerge the piece of fabric into the water for 1 minute. Remove the fabric from the water and allow the water to drip for 30 seconds. Measure the mass of the wet fabric. Record the mass in the data table.
Calculate the mass of water absorbed by the fabric. Make a graph to show the mass of water absorbed by the fabric.
Research to find out if each kind of fabric is natural or synthetic.

Observations:

Cotton / Linen / Wool
Silk / Polyester / Blend
Rayon / Nylon / Chamoise

Data Table:

Type of Fabric / Mass of Dry Fabric / Mass of Wet Fabric / Mass of Water Absorbed by Fabric / Natural or
Synthetic Fibers?
Cotton
Linen
Wool
Silk
Polyester
Blend
Rayon
Nylon
Chamoise

Analysis:

Rank the dry fabrics in order of mass from least to greatest.

Rank the wet fabrics in order of mass from least to greatest.

Rank the fabrics in order of water absorbed from least to greatest.

Is there a relationship between the mass of the dry fabric and the amount of water the fabric will absorb? Explain.

Is there a relationship between the kind of fabric (natural or synthetic) and the amount of water the fabric will absorb? Explain.

Which fabric will be the best choice for making a tent? A handbag? A dishcloth?

What property of water explains why the water is absorbed by the fabric?

Evaluate Part IName:______

HandoutDate ______

Water Property Scenarios

For each scenario, determine which property of water made the scenario possible. The properties/concepts may be used more than once.

Properties of Water:

Universal Solvent Capillary Action AdhesionBuoyancy

Surface Tension Polarity CohesionDensity