How do people use How do people use water?water?

With your table partner / group read With your table partner / group read the following and be prepared to the following and be prepared to report on how people use water:report on how people use water: Agriculture (p 16)Agriculture (p 16) Industry (p 17)Industry (p 17) Transportation (p 17)Transportation (p 17) Recreation (p 18)Recreation (p 18) Home (p 17)Home (p 17)

Water: A Vital Water: A Vital ResourceResource66thth Grade Science Grade Science

KMSKMS

How do people use water? How do people use water? (video clip)(video clip)

How_the_Actions_of_Humans_Threaten_Our_Fresh_Water.asf

Why is water so important Why is water so important to life? to life?

(p 19 -20)(p 19 -20)Type of WaterType of Water %% mlml

EarthEarth 100%100% 10001000

Salt WaterSalt Water 97%97%

IceIce 76 % of 3%76 % of 3%

Shallow Shallow GroundwaterGroundwater

12% of 3%12% of 3%

Deep GroundwaterDeep Groundwater 11 % of 3%11 % of 3%

Lakes and RiversLakes and Rivers 0.34 % of 3%0.34 % of 3%

Water vaporWater vapor 0.037% of 3%0.037% of 3%

How much fresh water do How much fresh water do we have?we have? With your group complete the “Sharpen your With your group complete the “Sharpen your

Skills Activity” p. 20Skills Activity” p. 20

Type of WaterType of Water %% mlml

EarthEarth 100%100% 10001000

Salt WaterSalt Water 97%97% 970970

IceIce 76 % of 3%76 % of 3% 22.822.8

Shallow Shallow GroundwaterGroundwater

12% of 3%12% of 3% 3.603.60

Deep GroundwaterDeep Groundwater 11 % of 3%11 % of 3% 3.303.30

Lakes and RiversLakes and Rivers 0.34 % of 0.34 % of 3%3%

.1020.1020

Water vaporWater vapor 0.037% of 0.037% of 3%3%

.0011.0011

What is the structure of What is the structure of water?water?

Hydrogen (a gas Hydrogen (a gas by itself)by itself)

Oxygen (a gas by Oxygen (a gas by itself)itself)

2 H atoms + 1 O 2 H atoms + 1 O atomatom

Polar molecule Polar molecule (like a small (like a small magnet)magnet)

What is a water molecule? What is a water molecule? (video clip)(video clip)

Matter__Building_Blocks_of_the_Universe.asf

Surface TensionSurface Tension Tightness across surface of waterTightness across surface of water Water molecules “stick together” Water molecules “stick together”

like magnetslike magnets Ex. (drops of water, paper clip Ex. (drops of water, paper clip

floating, “cupside down” demo)floating, “cupside down” demo)

Surface TensionSurface Tension

From a height of about 10 cm drop one drop From a height of about 10 cm drop one drop of one liquid on your wax paper watch what of one liquid on your wax paper watch what happens when it hits the wax paper, move happens when it hits the wax paper, move the wax paper around to make the drop the wax paper around to make the drop follow the path. follow the path.

Follow the same steps with a different liquid.Follow the same steps with a different liquid. Record your observations and draw a picture Record your observations and draw a picture

of the differences.of the differences. Try to float a paper clip on the water and Try to float a paper clip on the water and

one other liquidone other liquid

Capillary ActionCapillary Action

Water molecules Water molecules attraction to each attraction to each other + attraction other + attraction to surrounding to surrounding materialsmaterials

Water can act Water can act against gravityagainst gravity

Ex. (water in Ex. (water in plants, pores in plants, pores in bricks, paper towel)bricks, paper towel)

States of WaterStates of Water

Solid- Solid- Molecules (Mlc) close-together Molecules (Mlc) close-together Water forms “set” structureWater forms “set” structure Vibrating in place (cold)Vibrating in place (cold)

States of WaterStates of Water

LiquidLiquid Mlc move more freelyMlc move more freely Water takes shape of containerWater takes shape of container Mlc medium speed & temp.Mlc medium speed & temp.

States of WaterStates of Water

GasGas Mlc move very freelyMlc move very freely Spread out & fill spaceSpread out & fill space Move fast (Hot)Move fast (Hot)

DensityDensity

Each box has the same volume. Each box has the same volume. If If each ball has the same mass, each ball has the same mass, which box would weigh more? which box would weigh more? Why?Why?

DensityDensity The box that has more balls has The box that has more balls has

more mass per unit of volume more mass per unit of volume (DENSITY)(DENSITY)

Density= Mass/VolumeDensity= Mass/Volume Density = grams/milliliterDensity = grams/milliliter http://www.edinformatics.com/http://www.edinformatics.com/

math_science/density.htmmath_science/density.htm

Density PracticeDensity Practice

A certain rock has a mass of 4 g and A certain rock has a mass of 4 g and a volume of 2 ml what is the density?a volume of 2 ml what is the density?

Soda Comparison: Diet vs Soda Comparison: Diet vs RegularRegular

The mass of a can of The mass of a can of soda is _____ the soda is _____ the volume of the can of volume of the can of soda is ________ the soda is ________ the density is _________density is _________

The mass of a can of The mass of a can of diet soda is _____ the diet soda is _____ the volume of the can of volume of the can of diet soda is ________ diet soda is ________ the density is the density is __________________

Soda ComparisonSoda Comparison

MassMass VolumVolumee

DensitDensityy

Diet Diet SodaSoda

RegulaRegular Sodar Soda

Density HypothesisDensity Hypothesis

Your group will receive a vial with Your group will receive a vial with salt water and a vial with fresh salt water and a vial with fresh water. Write a hypothesis about water. Write a hypothesis about what you think will happen when what you think will happen when both are placed in a tank of water.both are placed in a tank of water.

Density Density

The mass of a vial of fresh water is The mass of a vial of fresh water is _____ the volume of the vial of fresh _____ the volume of the vial of fresh water is ________ the density is water is ________ the density is __________________

The mass of a vial of fresh water is The mass of a vial of fresh water is _____ the volume of the vial of fresh _____ the volume of the vial of fresh water is ________ the density is water is ________ the density is __________________

Density ActivityDensity Activity

MassMass VolumVolumee

DensitDensityy

Salt Salt WaterWater

Fresh Fresh WaterWater

DensityDensity

Based on your calculations, do you Based on your calculations, do you want to change your hypothesis? want to change your hypothesis?

Factors that Effect Factors that Effect Density Density

Dissolved solids (Salt, Minerals, etc.)Dissolved solids (Salt, Minerals, etc.)

TemperatureTemperature Hot water is less denseHot water is less dense

Calculate and Determine Calculate and Determine Which of the Following Which of the Following

Could Be The Same Could Be The Same SubstanceSubstance

SubstaSubstancence

MassMass VolumeVolume DensityDensity

AA 6g6g 2ml2ml

BB 200g200g 40ml40ml

CC 2g2g 4ml4ml

DD 39g39g 13ml13ml

AnswersAnswers

SubstaSubstancence

MassMass VolumeVolume DensityDensity

AA 6g6g 2ml2ml 3 g/ml3 g/ml

BB 200g200g 40ml40ml 5 g/ml5 g/ml

CC 2g2g 4ml4ml 0.5 0.5 g/mlg/ml

DD 39g39g 13ml13ml 3 g/ml3 g/ml

Water Properties: Water Properties: SolventSolvent

Solvent Solvent A liquid that dissolves another A liquid that dissolves another

substancesubstance SoluteSolute

Substance that is dissolved (Salt, Sugar, Substance that is dissolved (Salt, Sugar, etc.) etc.)

Solvent ActivitySolvent Activity

Measure 100 ml of water into each Measure 100 ml of water into each of 4 beakersof 4 beakers

Add 5ml of each of the following to Add 5ml of each of the following to each of the 4 beakers: Salt, Sand, each of the 4 beakers: Salt, Sand, Powdered Drink Mix, OilPowdered Drink Mix, Oil

Write a hypothesis stating which Write a hypothesis stating which substances water will dissolve the substances water will dissolve the best/worstbest/worst

Solvent ActivitySolvent Activity

Draw a picture and describe the Draw a picture and describe the resultsresults