Water Chemistry

Which of the following best explains the ideal structure of the dish soap molecule?

• The dish soap molecule must be polar at one end to dissolve grease, and nonpolar at the other end so it can dissolve in water.

• The dish soap molecule must be nonpolar so that it can dissolve in both grease and water.

• The dish soap molecule must be polar so that it can dissolve both grease and water.

• The dish soap molecule must be nonpolar at one end to dissolve grease, and polar at the other end so it can dissolve in water.

What are some special properties of water?

• Changes in state of matter

• High heat of vaporization

• All answers are correct

• None of the answers are correct

• Universal solvent

Tags

NGSS.MS-PS1-4

Why don't oil and water mix together?

• Oil is nonpolar and water is polar.

• Water is nonpolar and oil is polar.

• Both substances are polar and repel each other.

• Both substances are nonpolar and repel each other.

What is happening to the ocean's pH as it decreases?

• The ocean is becoming more acidic.

• The ocean is becoming more basic.

• The ocean is becoming more polar.

• The ocean is becoming more turbid.

Tags

NGSS.MS-PS1-2

Which two (2) variables are required when solving for salinity?

• mass of salt and volume of water

• mass of water and volume of salt

• mass of water and volume of water

• mass of salt and volume of salt

Why does ice float?

• Solid water is less dense than liquid water.

• Solid water is more dense than liquid water.

• Solid water has less specific heat than liquid water.

• Solid water has more dissolved oxygen than liquid water.

Tags

NGSS.MS-PS1-2

What happens to the density of saltwater as salinity increases?

• density increases

• density decreases

• density stays the same

Tags

NGSS.MS-PS1-2

How does an increase in temperature impact the amount of dissolved oxygen in a water sample?

• Higher temperatures reduce the amount of dissolved oxygen.

• Higher temperatures increase the amount of dissolved oxygen.

• Higher temperatures do not affect dissolved oxygen.

• Dissolved oxygen is a constant value for water.

Tags

NGSS.MS-PS1-4

Which property of water causes water droplets to stick to your car's windshield as you drive through the rain?

• adhesion

• cohesion

• surface tension

• density

Which property of water causes water drops to stick together and make larger water drops as they slide down the windshield of your car?

• cohesion

• adhesion

• surface tension

• density