Water Properties Review

Water Properties Review

Structure of Water

Multiple Choice

One water molecule is made up of....

• 2 oxygen and 1 hydrogen

• 2 hydrogen and 1 oxygen

• 1 helium and 2 oxygen

• 2 hydgen and 2 oxygen

Multiple Choice

Hydrogen has a _____ charge

• positive

• negative

• neutral

Multiple Choice

Oxygen has a ______ charge

• positive

• negative

• neutral

Open Ended

Why does water have an overall positive charge?

Water Structure

• 1 molecule of water is H2O

• hydrogen has a positive charge

• oxygen has a negative charge

• one negative cancels out one positive, leaving an overall positive charge

Water is a Polar Molecule

Multiple Choice

What does water being a polar molecule mean?

• water is attracted to magnets

• the positive end of 1 water moleucule is attracted to another molecules positive end

• They are related to the polar bear

• the positive end of 1 water molecule is attracted to another molecules negative end

EVERYTHING WATER DOES IS BECAUSE IT IS POLAR

Polar means the positive (hydrogen) end of one water molecule is attracted to the negative end of the oxygen in another molecule

Water is the Universal Solvent

Multiple Select

Check all of the following statements that are TRUE

• water can dissolve all 3 states of matter

• water can only dissolve solids

• water is the universal solvent because it is polar

• water only dissolves non polar substances

• water only dissolves polar substances

Open Ended

Water does not dissolve oils, why?

Water is the Universal Solvent

• water dissolves all 3 states of matter

• water dissolves only other polar substances

• solvent: does the dissolving

• solute: gets dissolved

• solution: final product

• happens because water is polar

Adhesion and Cohesion

Multiple Choice

Adhesion is...

• where water "sticks" to other water molecules

• where water "sticks" to other polar substances

Multiple Choice

Cohesion is...

• where water "sticks" to other water molecules

• where water "sticks" to other polar substances

Multiple Choice

True or false: whenever there is adhesion there is usually cohesion, they go together

• True, they usually go together at the same time

• False, they are similar but don't usually happen at the same time

Adhesion and Cohesion

• Usually go together

• Adhesion: water "sticking" to other POLAR substances

• Cohesion: water "sticking" to more water

• Happens because water is polar

Capillary Action

Multiple Select

Check all the examples of capillary action

• water collecting on a penny and not spreading

• water being pulled up to the tops of trees

• water climbing up a paper towel when the corner is placed in water

• paper clips floating on the top of water if placed carefully

Multiple Choice

What allows capillary action to happen?

• water is polar and has positive buoyancy

• water is polar and cohesion/adhesion

• water is polar and it has a high specific heat

• water is polar with a neutral pH

Capillary Action

• gives water the ability to "climb"

• major example is getting water to the top of trees (we did the paper towel example in class)

• caused because water is polar and adhesion/cohesion

Surface Tension

Surface Tension

• tightness across the surface of water

• belly flop (the more force the more it pushes back)

• caused becuase water is polar

Specific Heat

Multiple Choice

What kind of specific heat does water have?

• high

• low

Open Ended

What does it mean that water has a high specific heat?

Specific Heat

• the amount of energy needed to increase the temperature of something by 1 degree celsius

• the reason why the pool is still cold in June

• water has a high specific heat

Buoyancy

Multiple Choice

If I have positive buoyancy, I.....

• Flink

• Sink

• Float

Multiple Choice

Saltwater affects density.

• True

• False

Buoyancy

• ability to float

• positive, negative, neutral (3 types)

• related to density and surface area (think tiny hands)

• Saltwater makes water more dense, affecting buoyancy (think dead sea)

Density

Multiple Choice

What is the formula for density?

• volume/mass

• surface area/mass

• mass/volume

• volume/surface area

Multiple Select

Freshwater has a density of 1 g/L, which of the following would sink in freshwater?

• object A has a density of 1.1

• object B has a density of .01

• object C has a density of 2

• object D has a density of 1

Density

• amount of matter (stuff/atoms) in a given amount of volume (space)

• m/v=density

• if something is more dense, it will sink

• less dense it will float

• the exact same it will "flink"

pH

Multiple Choice

Which pH has more acid in it?

• Something with a pH of 2

• Something with a pH of 14

pH

• measurement of how acidic a substance is

• Range of 0-14

• lower the number the more acidic, the higher the more alkaline or basic it is

Overall Water Review

Multiple Choice

Most of the freshwater on earth is found in...

• ice caps/glaciers

• groundwater

• saltwater

Multiple Choice

Most of water's properties are because it....

• is wet

• is polar

• has a 1 g/mL density

• has a high specific heat