Water is the UNIVERSAL solvent. Why?

WATER is the UNIVERSAL SOLVENT because it DISSOLVES almost EVERYTHING!

WHAT MAKES this WATER SO UNIQUE?

WHAT MAKES H2O SO UNIQUE?

WHAT MAKES H2O SO UNIQUE? (ONE-OF-A-KIND)

Why is water is so special?

Why water is so special…

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

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

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

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

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

Why is water is so special… It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE ???

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

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

(Leave room for #4 LATER!) It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE Its SOLID form (ice) is LESS DENSE than its LIQUID form ____________________________________________________________________________________________________

anyways…

These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!! It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE Its SOLID form (ice) is LESS DENSE than its LIQUID form

Illustrate with students…

1. How does water dissolve so much stuff. 2 1. How does water dissolve so much stuff? 2. Why is it slow to heat up and 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

Opposite charges attract… like charges repel. Just like a MAGNET

OPPOSITE POLES ATTRACT 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 H2O molecule acts like a tiny magnet. AND… LIKE POLES REPEL OPPOSITE POLES ATTRACT

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

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

Like the magnets that can tear your insides up!

“Magnetic”water molecules are great at breaking down solutes to their individual molecules!

These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!! It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE Its SOLID form (ice) is LESS DENSE than its LIQUID form

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

Flowing “magnetic” water molecules are in a constant motion of push and pull! They have their own agenda.

Because water molecules have POLARITY, they repel when they freeze & get too 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…

Why does water FLOAT when frozen? IT’S VOLUME INCREASES!!! mass --------------- volume density =

These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!! It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE Its SOLID form (ice) is LESS DENSE than its LIQUID form

Flowing water molecules are in a constant motion of push and pull Flowing water molecules are in a constant motion of push and pull! They have their own agenda. Like fans at a Bieber concert…

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

These 3 UNIQUE PROPERTIES of H2O can be explained at the ATOMIC level!! It DISSOLVES most stuff—UNIVERSAL SOLVENT Its high specific heat helps MODERATE our Earth’s CLIMATE Its SOLID form (ice) is LESS DENSE than its LIQUID form

Thurs…

What can “polar/magnetic” water molecules do?

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION WATER STICKS TO OTHER STUFF. pencils, paper towels, clothes

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION ????? WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS!

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

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

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

WATER MOLECULES have POLARITY & act like tiny MAGNETS: ADHESION COHESION 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!!!

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 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!

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?

Give 2 reasons why does pepper float 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). 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 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 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 COHESION WATER STICKS TO OTHER STUFF. DEFIES GRAVITY!!! CAPILLARY ACTION in PLANTS! WATER MOLECULES STICK TO OTHER WATER MOLECULES. COoperating! SURFACE TENSION of WATER!

end

old stuff follows…

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

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

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

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

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

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

Why is water is so special… 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… 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 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.