WHY is water such a good solvent WATER

WHY is water such a good solvent?

WATER is the UNIVERSAL SOLVENT because it DISSOLVES almost EVERYTHING! But HOW? ? ?

WHAT MAKES this WATER SO UNIQUE?

WHAT MAKES H 2 O SO UNIQUE?

WHAT MAKES H 2 O SO UNIQUE? (ONE-OF-A-KIND)

Why is water is so special?

Why water is so special…

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT

Compare annual temps on Earth to DAILY temps on Mars… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT All year on Earth 2. ? ? ? ONE typical night on Mars

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. ? ? ? -184 degrees F to -85 degrees F

Why is WATER is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE light balloons with & without water

Tiered- hand out “SPECIFIC HEAT” wksheet Students staple. Go over the first few…. assign the rest for homework or end-of-class work

What is frozen water doing to keep this polar bear alive? 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. ? ? ?

SOLID WATER FLOATS!!! 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form

These 3 UNIQUE PROPERTIES of H 2 O can be explained at the ATOMIC level!! 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form

�Illustrate with students…

1. How does water dissolve so much stuff? 2. Why is it SO slow to heat up and SO slow cool down? 3. How can it float when frozen?

�volunteers, balloons and stuff

A water molecule has a positive side & a negative side.

A water molecule has a positive side & a negative side. Remember the model of our water molecule yesterday

Water molecules have a positive and a negative side… just like a MAGNET

Because magnets have a positive & a negative side, we say magnets have poles… LIKE POLES REPEL OPPOSITE POLES ATTRACT

Magnets have poles like Earth! LIKE POLES REPEL OPPOSITE POLES ATTRACT

That’s why we say the WATER MOLECULES have POLARITY!

So, EACH H 2 O molecule acts like a tiny polar magnet. �AND… LIKE POLES REPEL OPPOSITE POLES ATTRACT

That’s why we say the WATER MOLECULES have POLARITY! They ACT LIKE TINY MAGNETS.

Like the magnets that can push & pull apart piles of metal scrap…

“Magnetic” water molecules are great at pushing & pulling apart solutes down to their individual molecules!

These 3 UNIQUE PROPERTIES of H 2 O can be explained at the ATOMIC level!! 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form 4.

Flowing “magnetic” water molecules are constantly pushing and pulling! They have their own agenda. �They aren’t influenced as much things around them.

Polar water molecules don’t respond as quickly as other molecules to a bit of heat or cold.

These 3 UNIQUE PROPERTIES of H 2 O can be explained at the ATOMIC level!! 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form

When POLAR water molecules act like magnets, more UNIQUE stuff happens.

Flowing “magnetic” LIQUID water molecules are in a constant motion of push and pull! But if they freeze solid, like sides repel more.

Because water molecules have POLARITY, they repel when they freeze because negative-to-negative & positive-to-positive sides can’t stay locked together that close. show soda can, lil magnets Discuss about students in a hallway

That’s why water EXPANDS when frozen while most matter contracts �show soda can…

Liquid water actually expands when frozen E A E D O FR S e n a in th e h S w E e D k i L PLO EX ! R ZE IT’S VOLUME INCREASES!!! density = mass -------- volume

These 3 UNIQUE PROPERTIES of H 2 O can be explained at the ATOMIC level!! 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. Its high specific heat helps MODERATE our Earth’s CLIMATE 3. Its SOLID form (ice) is LESS DENSE than its LIQUID form

What else can “polar/magnetic” water molecules do?

What else can “polar/magnetic” water molecules do? ADHESION

What else can “polar/magnetic” water molecules do? ADHESION

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. pencils, paper towels, clothes

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in in PLANTS!

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! ? ? ?

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! COHESION

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! COHESION WATER MOLECULES STICK TO EACH OTHER.

What else can “polar/magnetic” water molecules do? ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! COHESION WATER MOLECULES STICK TO EACH OTHER. Like people COoperating!

What else can “polar/magnetic” water molecules do? COHESION ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! WATER MOLECULES STICK TO EACH OTHER Like people COoperating! SURFACE TENSION of WATER! THANK YOU WATER MOLECULES FOR STICKING TOGETHER!!!

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Let's illustrate First with students then with cups….

Let's illustrate Need volunteers…

Can you get a staple to “float” on water?

Can you get a staple to “float” on water? Why did I put float in quotation marks?

Can you get a staple to “float” on water? �Why did I put float in quotation marks? �Why does the staple actually rest on top of water?

Can you get a staple to “float” on water? �Why did I put float in quotation marks? �Why does the staple actually rest on top of water? �SURFACE TENSION!! The water molecules stick together and form a “magnetic skin” on top of more water.

…Now for some pepper.

�Give 2 reasons why pepper floats on water?

�Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water).

Let’s try to BREAK the polarity of water!

�Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water). �What happened when soap touched the surface of the water?

�Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water). �What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away).

�Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water). �What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away). �Why?

Soap molecule….

Soap molecule…. Soap molecules mess up the way water molecules want to stick to each other.

�Give 2 reasons why does pepper float on water? Pepper is less dense than water, AND water’s cohesion to itself creates surface tension (skin on water). �What happened when soap touched the surface of the water? The soap repelled the pepper (pushed it away). �Why? Soap molecules mess up the way water molecules want to stick to each other.

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! COHESION WATER MOLECULES STICK TO OTHER WATER MOLECULES. COoperating! SURFACE TENSION of WATER!

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�old stuff follows…

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter.

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter. SOLID, LIQUID

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter. SOLID, LIQUID GAS

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter. 3. It’s NECESSARY for LIFE!

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter. 3. It’s NECESSARY for LIFE!

Why is water is so special… 1. It DISSOLVES most stuff—UNIVERSAL SOLVENT 2. It occurs NATURALLY in ALL 3 STATES of matter. 3. It’s NECESSARY for LIFE!

Why is water is so special… 1. 2. 3. 4. It DISSOLVES most stuff—UNIVERSAL SOLVENT It occurs NATURALLY in ALL 3 STATES of matter. It’s NECESSARY for LIFE! Its SOLID form (ice) is LESS DENSE than its LIQUID form.

Why is water is so special… 1. 2. 3. 4. It DISSOLVES most stuff—UNIVERSAL SOLVENT It occurs NATURALLY in ALL 3 STATES of matter. It’s NECESSARY for LIFE! Its SOLID form (ice) is LESS DENSE than its LIQUID form. aka…ICE FLOATS!

3/4 can be explained ATOMICALLY 1. 2. 3. 4. It DISSOLVES most stuff—UNIVERSAL SOLVENT It occurs NATURALLY in ALL 3 STATES of matter. It’s NECESSARY for LIFE! Its SOLID form (ice) is LESS DENSE than its LIQUID form.