View source for AY Honors/Water Science/Answer Key/en

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<!-- 1. Making use of household products build a 3-D model of the water atom. Explain its chemical composition. -->
The water molecule is formed when two Hydrogen (H) are united via a covalent bond to one Oxygen atom (O); H<sub>2</sub>O. There are many ways to create models. The photos below provide some ideas.

[[File:H2O model candy.jpg|thumb|right|200px|Using toothpicks and candy]]
[[File:H2O model paper.jpg|thumb|left|200px|Using craft sticks and paper]]
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<!-- 2. List and describe (in writing or orally) some characteristics of water that distinguish it from nearly all elements. -->
Water is odorless, tasteless and colorless. Water has a remarkable ability to resists rapid changes in temperature. As a result, water-cools and warms up more slowly than air. This serves as a clear advantage for marine life that requires a more stable body temperature, creating a more desirable environment in which to live. 

Another remarkable ability of water is that it expands when it freezes. This characteristic of water gives it the ability to sustain marine life during the winter seasons, after the water has frozen on top. The expansion of water also causes crystals to form. This gives water the ability to kill cells since the crystals can break cells apart. Freezing water can also causes rocks to break after the water expands from inside.

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<!-- 3. Making use of photos, diagrams, or any other form of visual aid illustrate the three states of water. -->

Water has three phases: solid (ice), liquid (water), gas (vapor). These can be illustrated in a diagram by showing how the water molecules are structured in each state:

<gallery>
File:Teilchenmodell Feststoff.svg|Ice
File:Teilchenmodell Flüssigkeit.svg|Liquid water
File:Teilchenmodell Gas.svg|Vapor
</gallery>

;Solid: In a solid the particles (ions, atoms or molecules) are closely packed together. The forces between particles are strong so that the particles cannot move freely but can only vibrate. As a result, a solid has a stable, definite shape, and a definite volume. Solids can only change their shape by force, as when broken or cut.

;Liquid: A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. 

;Gas: A gas is a compressible fluid. Not only will a gas conform to the shape of its container but it will also expand to fill the container.

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<!-- 4. Describe, illustrate or represent the difference between clouds, snow and rain. -->
Clouds, snow, and rain are all made up of some form of water. A cloud is made of tiny water droplets and/or ice crystals, a snowflake is an aggregate of many ice crystals, and rain is just liquid water.

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<!-- 5. Through photos or diagrams identify and list the five main types of precipitation. -->
The main types of precipitation are:
# Rain
# Snow
# Sleet
# Freezing rain
# Hail

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<!-- 6. What is the boiling and freezing point of water? -->
The boiling point of water is 212 °F or 99.98 °C. The freezing point of water is 32 °F or 0.0 °C.

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<!-- 7. Water Trivia: The following questions can be utilized in different forms to promote learning and understanding about water. Questions can be adapted for Jeopardy, Bingo, and Wheel of Fortune among many others. Creativity is strongly encouraged. -->

Printable Water Science Jeopardy pages available [https://drive.google.com/file/d/1DWFJUiCEW37AI6pFJk4r1EJwlVNqsNBD/view?usp=sharing here].
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A US liquid gallon of water weighs about 8.34 pounds or 3.78 kilograms at 62 °F (17 °C), making it about 16.6% lighter than the imperial gallon.
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The Human body is approximately 65% water [[w:Body_water#In_humans|Body Water]]
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The Pacific Ocean
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The Caspian Sea [[w:List_of_lakes_by_area|List of Lakes by Area]]
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Lake Superior [[w:List_of_largest_lakes_of_the_United_States_by_area US|Lakes by Area]]
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It travels faster through water [[w:Speed_of_sound|Speed of sound]]
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The Mariana Trench
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The Nile River
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Three days
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The presence of Calcium and Magnesium in the water
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The toilet and shower use approximately 27% of household water
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Relative humidity
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Panama Canal
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Water conducts heat around 25 times more efficiently than air.
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It is commonly recommended to drink eight 8-ounce glasses, which equals about 2 liters, or half a gallon. Though, some experts recommend drinking a half-ounce to an ounce for each pound of your body weight. 
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Chlorine.
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A typical shower uses 2.1 gallons per minute (gpm) So, a 5 minute shower would used a total of 10.5 gallons. 
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The Mississippi [In the U.S.]
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True

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<!-- 8. Answer the following: -->
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Water covers 71% of the Earth's surface. It is vital for all known forms of life. 
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Only 2.5% of this water is freshwater, and 98.8% of that water is in ice (excepting ice in clouds) and groundwater. Less than 0.3% of all freshwater is in rivers, lakes, and the atmosphere, and an even smaller amount of the Earth's freshwater (0.003%) is contained within biological bodies and manufactured products. A greater quantity of water is found in the earth's interior.
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On Earth, 96.5% of the planet's crust water is found in seas and oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps of Antarctica and Greenland, a small fraction in other large water bodies, and 0.001% in the air as vapor, clouds (formed of ice and liquid water suspended in air), and precipitation.

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<!-- 9. Select three of the following and discuss at least one way water is used. -->

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The most important use of water in agriculture is for irrigation, which is a key component to produce enough food. 
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Water is heavily used to form solutions and mixtures for washing processes. A number of industrial processes rely on reactions using chemicals dissolved in water. Washing is also an important component of several aspects of personal body hygiene. 
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To function properly and regulate body temperature, the human body requires between one and seven liters of water per day to avoid dehydration.
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The evaporation of water carries heat away from fire. Because of this, water is very useful as a fire extinguishing fluid. 
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The use of water plays a critical role in the world economy. The transportation of materials through rivers and canals by means of cargo ships and tankers fosters international shipping and trading.

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<!-- 10. What is a body of water? Through photos, diagrams or sketches, be able to illustrate the following bodies of water below, naming one that can be found in your city, town, county or state. (if possible) -->

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<!-- 11. Discuss with a group the biblical context of at least three of the following text as each relates to the significance of water in the Bible. -->

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{{

Bible verse
|book=Genesis
|chapter=1
|verse=20
|version=NKJV
|text=Then God said, “Let the waters abound with an abundance of living creatures, and let birds fly above the earth across the face of the firmament of the heavens.” 

}}

God commanded that the waters bring forth life for all water living creatures.

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{{

Bible verse
|book=Exodus
|chapter=14
|verse=21
|version=NKJV
|text=Then Moses stretched out his hand over the sea; and the Lord caused the sea to go back by a strong east wind all that night, and made the sea into dry land, and the waters were divided. 

}}

In the midst of fear and doubt, God used the staff of Moses to open the Red Sea so the children of Israel could walk through on dry ground.

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{{

Bible verse
|book=Matthew
|chapter=28
|verse=19
|version=NKJV
|text=Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit.

}}

The great commission to all believers, to go unto the entire world and baptize by immersion in water; all those who believe in the name of the Father, Son, and the Holy Ghost.

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{{

Bible verse
|book=John
|chapter=3
|verse=5
|version=NKJV
|text=Jesus answered, “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.

}}

A man must be born again in the Spirit and by the act of baptism (immersion in water) to enter into the Kingdom of God.

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{{

Bible verse
|book=John
|chapter=4
|verse=14
|version=NKJV
|text=but whoever drinks of the water that I shall give him will never thirst. But the water that I shall give him will become in him a fountain of water springing up into everlasting life.”

}}

Jesus said that the water that He gives is unlike any water, for we will never thirst again and will lead us to everlasting life.

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{{

Bible verse
|book=Revelation
|chapter=22
|verse=1
|version=NKJV
|text=And he showed me a pure river of water of life, clear as crystal, proceeding from the throne of God and of the Lamb. 

}}

John the Revelator was shown crystal clear water flowing from the throne of god and the Lamb.

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<!-- 12. Demonstrate a technique that can be used to convert salt water into clean drinking water. -->
The distillation method can be used to convert salt water into clean drinking water. This process basically brings the salt water to a boil, causing the water to evaporate, leaving the salt and other chemicals behind. The evaporated water is then captured and recondensed by cooling to form fresh drinking water.

*Place a clean cup (such as a ceramic mug) in the center of a deep pot. 
*Pour salt water into the pot, being sure to not add so much as to cause the mug to float. Be careful not to get any of the salt water in the mug
*Place a lid upside-down on the pot so that the handle faces down over the mug.
*Bring the water to a boil.
*As the water boils, it will evaporate and condense on the lid as liquid water. This water will then drip from the lid into the mug.
*Do not let all of the water evaporate from the pot.
*Turn off the heat and allow to cool before touching the mug.

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==References==
[[w:Water|Wikipedia article on Water]]

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