3.6 WATER PROPERTIES How do you make ocean water? Activity Time: 15 minutes Teacher introduces kinds of water and its location by showing globe. Make a list of what students know on board. 1. Measure 3 1/2 teaspoons of salt into a metric pitcher. 2. Add 1000 ml (or 4 1/4 cups) of water. 3. Stir the salt and water. 4. Taste the sea water by using a clean plastic spoon. 5. Rub 2 rocks together and place in saltwater pitcher. Students: 1 picture graph of sea water* 1 globe Per Group: Table salt Pitcher of water 1 teaspoon 1 metric measuring pitcher 1 plastic spoon per person Large spoon for stirring 2 small rocks for each student • Where does the ocean get its salt? (From rivers) • Where do rives get their minerals like salt? (From rocks) • Can you see the salt in water? (Water is a solvent, so if it is not saturated, the salt disappears.) • What is salt? (Soldium chloride, a chemical compound that contains an acid and a base.) • Research the chemical compound of salt to find an image of the elements combined. • Make your own salt by filling a tablespoon halfway with vinegar. Spring baking soda over the vinegar until the bubbling stops. Which ingredient is the acid and which is the base? Complete Assessment 3.6: How do you make ocean water? (See Rubric 3.6 for scoring.) How do you lift an iceberg with a string? (4.2) Background Directions Materials Discussion Extension Assessment Related Activities Seventy percent of the earth is water, and of that, 97% is salt water. Where does that salt come from? Every stream and river that flows into the ocean carries some amount of salt in it. The salt comes from erosion of the minerals in those waters. It is said that one fourth of the material that the Mississippi River deposits in the ocean is dissolved minerals. Ocean water contains about 3.5% salts, mostly sodium chloride (table salt), potassium, and calcium and magnesium salts. Small plants and animals (plankton) use some of the salts and the ocean floor removes some of them as well. Most of the table salt remains in the water, however, and that accounts for the taste. Vocabulary Mineral: a substance that occurs naturally in rocks and in the ground that has its own appearance and chemical composition. Dissolve: to become absorbed in liquid. Volume: sodium chloride, which is a chemical compound that contains and acid an a base. ALIGNMENT TO NGSS: Scientific and Engineering Practices • Asking questions • Developing and using models • Planning and carrying out investigations • Constructing explanations • Engaging in argument from evidence • Obtaining, evaluating, and communicating information Crosscutting Concepts • Cause and effect • Stability and change Disciplinary Core Ideas • K-5: ESS2.A; ESS2.C; PS1.A • 6-8: ESS2.A; ESS2.C; PS1.A

Activity Time: 15 minutes - University of Kansas...3.6 WATER PROPERTIES How do you make ocean water? Activity Time: 15 minutes Teacher introduces kinds of water and its location by

Download PDF Report

Upload
others
View
0
Download
0

Embed Size (px)

Citation preview

3.6 WATER PROPERTIES

How do you make ocean water?Activity Time: 15 minutes

Teacher introduces kinds of water and its location by showing globe. Make a list of what students know on board.

1. Measure 3 1/2 teaspoons of salt into a metric pitcher.2. Add 1000 ml (or 4 1/4 cups) of water.3. Stir the salt and water.4. Taste the sea water by using a clean plastic spoon.5. Rub 2 rocks together and place in saltwater pitcher.

Students:

1 picture graph of sea water*1 globe

Per Group:Table saltPitcher of water1 teaspoon1 metric measuring pitcher1 plastic spoon per personLarge spoon for stirring2 small rocks for each student

• Where does the ocean get its salt? (From rivers)• Where do rives get their minerals like salt? (From rocks)• Can you see the salt in water? (Water is a solvent, so if it is not saturated, the salt disappears.)• What is salt? (Soldium chloride, a chemical compound that contains an acid and a base.)

• Research the chemical compound of salt to find an image of the elements combined.• Make your own salt by filling a tablespoon halfway with vinegar. Spring baking soda over

the vinegar until the bubbling stops. Which ingredient is the acid and which is the base?

Complete Assessment 3.6: How do you make ocean water? (See Rubric 3.6 for scoring.)

How do you lift an iceberg with a string? (4.2)

Background

Directions

Materials

Discussion

Extension

Assessment

Related Activities

Seventy percent of the earth is water, and of that, 97% is salt water. Where does that salt come from? Every stream and river that flows into the ocean carries some amount of salt in it. The salt comes from erosion of the minerals in those waters. It is said that one fourth of the material that the Mississippi River deposits in the ocean is dissolved minerals. Ocean water contains about 3.5% salts, mostly sodium chloride (table salt), potassium, and calcium and magnesium salts. Small plants and animals (plankton) use some of the salts and the ocean floor removes some of them as well. Most of the table salt remains in the water, however, and that accounts for the taste.

VocabularyMineral: a substance that occurs naturally in rocks and in the ground that has its own appearance and chemical composition.

Dissolve: to become absorbed in liquid.

Volume: sodium chloride, which is a chemical compound that contains and acid an a base.

ALIGNMENT TO NGSS:Scientific and Engineering Practices•Asking questions•Developing and using models•Planning and carrying out

investigations•Constructing explanations•Engaging in argument from

evidence•Obtaining, evaluating, and

communicating informationCrosscutting Concepts•Cause and effect•Stability and change

Disciplinary Core Ideas•K-5: ESS2.A; ESS2.C; PS1.A•6-8: ESS2.A; ESS2.C; PS1.A