Properties of Water

What is the role of cohesion in water?

• Water molecules stick together, forming a droplet.

• Water molecules repel each other, causing evaporation.

• Water molecules break apart, leading to electrolysis.

• Water molecules attract oil molecules, causing emulsion.

What is the significance of water's high specific heat?

• It allows ice to float on water.

• It enables certain insects to walk on water.

• It facilitates capillary action in plants.

• It enables water to absorb large amounts of heat without a significant increase in temperature.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How does the polarity of water molecules contribute to its cohesive property?

• The positive and negative ends of water molecules attract each other, forming a bond.

• The positive and negative ends of water molecules repel each other, causing evaporation.

• The polarity of water molecules has no effect on its cohesive property.

• The polarity of water molecules causes them to break apart, leading to electrolysis.

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NGSS.MS-PS2-5

A water strider can skate along the top of a pond because....

• covalent bonds result in water cohesion (surface tension)

• hydrogen bonds result in water cohesion (surface tension)

• water striders have adapted to become lighter than water

• low surface tension of water

Answer explanation

Cohesion is where water molecules stick together because of hydrogen bonding.

Attractions between water molecules are called ....

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

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

• adhesion

• capillary action

• cohesion

• surface tension

Answer explanation

Cohesion is where water molecules stick together because of hydrogen bonding.

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.

• The water molecule is neutral.

Answer explanation

A bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule is called ..........

• polar molecule

• solution

• adhesion

• hydrogen bond

Answer explanation

Hydrogen bonds are due to water molecules being polar.

Tags

NGSS.MS-PS2-5

The tendency of molecules of the same kind to stick to one another is called .....

• cohesion

• adhesion

• solution

• polar molecule

Answer explanation

Co means together, so cohesion means water molecules sticking together.

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NGSS.MS-ESS2-4

A molecule in which opposite ends have opposite electric charges is called .....

• cohesion

• polar molecule

• hydrogen bond

• solution

Answer explanation

It is a polar molecule because of the unequal sharing of electrons creating a slightly negative pole and a slightly positive pole in the same molecule.