Properties of Water Lab

How many drops on rubbing alcohol?

18

How many drops can fit on a penny?

26

Station 2: Define mixture

A material composed of 2 or more elements or compounds that are physically mixed but not chemically combined.

Station 1: What is a polar molecule?

A polar molecule is positively charged on 1 side and negatively on the other.

Define solute.

A solute is the substance being dissolved.

What property of water allows the water to form a dome-like structure on top of the penny?

Adhesion

What causes water to have a high heat of vaporization?

Adhesion causes water to have a high heat of vaporization.

Define adhesion

Adhesion is an attraction between molecules of different substances.

What property of water allows the paper clips to be attracted to the plain water?

Cohesion

What property of water allows the water to stick to the penny?

Cohesion

Station 5: What 2 properties of water contribute to capillary action?

Cohesion Adhesion

Define cohesion.

Cohesion is an attraction between molecules of the same substance.

What are two types of mixtures.

Herbs and salad dressing are an example.

Describe why ice floats on the water.

Ice is less dense than the water, causing it to float.

Station 4: Why can solid ice float on liquid water?

Ice is less dense than water.

How did the soap affect the paper clip's ability to float?

It affected the cohesive property of water.

Describe the significant of water being a universal solvent in our bodies.

It can dissolve substances and it takes along valuable chemicals, minerals, and nutrients with it.

Station 3: How many hydrogen bonds can a single water molecule have?

It can have as much as 4

Describe the appearance of the test tube with oil and salt.

It did not dissolve and the salt fell to the bottom.

What does the solution (water)look like on the penny?

It had a larger bubble over the penny.

What charge does the hydrogen have in a molecule of water?

It has a negative charge.

What charge does the oxygen have in a molecule of water?

It has a positive charge.

Explain why it is important for hydrogen bonds to be weak bonds instead of strong bonds.

It is important for hydrogen bonds to be weak bonds instead of strong bonds because it gives water its unique characteristics.

The Green Basilisk Lizard can run to water.

It is incontart with a wide area of the water, and its lightweight keep it atop.

How do you think specific heat of water allows organism to maintain a steady internal body temp?How does this help humans maintain homeostasis?

It keeps the temperature relatively constant.

Describe the importance of high heat of vaporization to ecosystems?

It moderates the temperature of the ecosystem.

Imagine a world where ice was more dense than liquid water. What would this world be like? What would the consequences be for life in your local freshwater streams and lakes?

Life would be impossible on Earth because all bodies of water would be frozen solid.

Describe an example of cohesion and adhesion that you might observe during your daily life.

Pine needles on a rainy day show cohesion and adhesion because the water sticks to itself creating water droplets.

Station 8: Define specific heat.

Specific heat is the amount of heat per unit of mass required to raise the temperature by 1 degree Celsius.

Station 6: How does water hold up materials that is heavier than itself?

Surface tension allows the water to hold up materials heavier than itself.

Describe why the polymer ball is at the bottom of the vegetable oil.

The ball is more dense than the oil.

Make some observations about what you saw during the demonstration? (balloon)

The balloon filled with the water did not pop. The water maintained the same temperature.

What does the solution (rubbing alcohol) look like on the penny?

The bubble was not as large and it was not over the penny that much.

What property of water gives it a high surface tension?

The cohesive property.

When a lake freezes, how does the density of water prevent all of the living organisms in the lake from freezing as well?

The floating ice insulates the liquid water below.

Station 7: Define heat of vaporization.

The heat of vaporization is the quantity of heat a liquid must absorb for 1 gram to be converted from a liquid to a gas (BOILING POINT)

Describe the appearance of the test tube with water and salt.

The salt dissolved with the water and it DID not fall to the bottom.

Define solvent.

The substance in which the solute dissolves

What happens to the surface when water evaporates?

The surface of water the remains will cool down.

Explain why one balloon popped and the other remained intact.

The water maintained its temperature.

Explain why the vessels that transport water in trees must be very small in diameter.

There has to be less of a distance.

What are the bonds called between two hydrogen atoms?

They are called hydrogen bonds.

Explain why this property of water is essential for organisms like water bugs.

This is essential for water bugs so that they can walk on the surface of water. It is also important so they can be attached and so there is mobility.

A wolf spider is able to sit on a body of water without falling through. How is this possible?

This is possible because the wolf spider's weight is not enough to break the surface tension. The bond is too strong for cohesion to break it.

Why do large bodies of water not change temperature easily?

Water has a high heat capacity. As water freezes, its molecules spread apart into a specific arrangement that makes frozen water less dense than liquid water.

How does water move up the thin walls of a tube? What is it sticking to?

Water is attracted to the walls of a tube. The water sticks to itself.

Name the elements that make up water.

Water is made up of a hydrogen atom and an oxygen atom.

Explain why more water drops could fit on a penny when compared to rubbing alcohol?

Water likes to stick to itself while the rubbing alcohol slides off.

How does water's high heat of vaporization help you feel cooler when you sweat?

Water's high heat of vaporization helps because it extracts the sweat.

Why is water considered the greatest solvent on Earth?

Water's polarity gives it the ability to dissolve both ionic compounds and other polar molecules.

The (a) ____ atom of one water molecule will bond with (b)____ atoms of other water molecules.

a- oxygen b- hydrogen The oxygen atom of one water molecule will bond with hydrogen atoms of other water molecules.