Exploring Water and Its Unique Properties

What is the bond angle in a water molecule?

• 120 degrees

• 180 degrees

• 105 degrees

• 90 degrees

Why does water have a high surface tension?

• Due to strong hydrogen bonds between water molecules

• Because of its low density

• Due to its high vapor pressure

• Because it is a non-polar molecule

What is a surfactant?

• A substance that increases water's surface tension

• A substance that decreases water's vapor pressure

• A substance that makes water less cohesive

• A substance that interferes with hydrogen bonds in water

Tags

NGSS.HS-PS2-6

Why is water's boiling point higher than expected?

• Due to the presence of surfactants

• Because water has a high vapor pressure

• Due to the strong hydrogen bonds between water molecules

• Because water molecules are very light

Tags

NGSS.MS-PS3-4

What happens to water's density as it cools down to 4 degrees Celsius?

• It increases until 4 degrees Celsius, then decreases

• It decreases continuously

• It remains constant

• It increases continuously

Tags

NGSS.MS-PS1-4

Why does ice float on water?

• Because ice has a lower density than water

• Because ice is non-polar

• Because ice is denser than water

• Because ice has a higher surface tension

How much energy is required to raise the temperature of 1 gram of water by 1 degree Celsius?

• 2.184 joules

• 3.184 joules

• 4.184 joules

• 5.184 joules

What is the heat of fusion for water?

• 234 joules per gram

• 334 joules per gram

• 434 joules per gram

• 534 joules per gram

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why does snow take a long time to melt even on a warm day?

• Because snow has a high density

• Because melting snow requires a lot of energy

• Because snow has a low density

• Because snow has a high vapor pressure

Tags

NGSS.MS-PS1-4

What happens to the density of water as it freezes?

• It decreases

• It remains constant

• It fluctuates

• It increases