Which end of the water molecule has a slightly positive charge?

both ends are slightly positive

The reason the water balloon did NOT pop while held over a flame is water's _________.

Hydrogen bonds between water molecules.

What is the reason why oil and water don't mix?

Water can only mix with polar molecules

Oil is too heavy to mix with water

Water can only mix with non-polar molecules

Oil is too light to mix with water

Capillary action is the result of adhesion. Which aspect of water is responsible for this?

Hydrogen bonds between water and another substance

Nonpolar covalent bonds that enable water to dissolve other substances

Polar covalent bonds that join molecules of water to other substances

Ionic bonds that enable electrons to flow through water and into another substance

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

The insects are light enough so they do not break the hydrogen bonds holding the water molecules together

The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

A high specific heat means...

It requires more energy to change temperature

It heats up quickly with energy added

Why does water move from the roots to the leaves of plants?

Capillary action pulls the water molecules like a chain

Water’s cohesion causes it to “pull” towards the leaves

Water is polar because...

The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

The molecule has two poles, at which the it is colder than other regions of the molecule.

The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.

Review and Properties of Water

Authored by Charles Martinez

Biology

9th Grade

NGSS covered

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23 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What word describes when water is attracted to other substances?

cohesion

adhesion

capillary action

surface tension

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Why can water have no net charge but have slight charges in different parts of the molecule?

The oxygen end is slightly negative and the hydrogen end is slightly positive

The hydrogen end is slightly negative and the oxygen end is slightly positive

The hydrogen and oxygen ends change in polarity

Because it is hydrophobic

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Attractions between water molecules are called

Covalent bonds

Ionic bonds

Polar bonds

Hydrogen bonds

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attracted to other water molecules.

adhesion

capillary action

cohesion

surface tension

MULTIPLE CHOICE QUESTION

1 min • 1 pt

tendency of molecules of the same kind to stick to one another

cohesion

adhesion

solution

polar molecule

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Why does ice float?

As water freezes, it expands and its density decreases.

As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A molecule with electrically charged areas is called a _______________.

magnet

polar molecule

solution

electrical molecule

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Review and Properties of Water

What word describes when water is attracted to other substances?

Why can water have no net charge but have slight charges in different parts of the molecule?

Attractions between water molecules are called

The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attracted to other water molecules.

tendency of molecules of the same kind to stick to one another

Why does ice float?

A molecule with electrically charged areas is called a _______________.

Which end of the water molecule has a slightly positive charge?

Water droplets take a spherical shape (as pictured) because of ____________

The reason the water balloon did NOT pop while held over a flame is water's _________.

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