Quiz: Properties of water

Transpiration is the process by which water is carried through plants from the roots to small pores on the underside of leaves. The water is then released to the atmosphere as water vapor. The picture below demonstrates the process of transpiration. This process is made possible primarily by

• osmosis.
• diffusion.
• vertical tension.
• adhesion and cohesion.

Small insects, like the water strider pictured below, are able to move across the surface of a pond without breaking the surface of the water. This phenomenon can be explained by

• low surface tension of water.
• covalent bonding between the water molecules.
• hydrogen bonds between the water molecules.
• water striders have a low surface area to mass ratio.

10. The model below shows water molecules interacting, The gray circles represent oxygen, and the white circles represent hydrogen. What conclusion does this model support?

• Slight negative charges around the oxygen molecule and the slight positive charges of hydrogen atoms form a molecule that exhibits hydrogen bonding.
• The two hydrogen atoms are both attracted to the negative oxygen atom, sharing the electrons equally, forming a nonpolar molecule.
• Strong negative charge of oxygen molecules is equally shared by the hydrogen atoms, forming polar molecules that exhibit hydrogen bonding.
• The two hydrogen atoms generate a strong positive charge that attracts and bonds with the weak negative oxygen atom that exhibit ionic bonding.

The below molecule is water. A water molecule is polar. This means that the water molecule has two differently charged areas, due to the arrangement of shared electrons around the molecule. Which statement below describes the polarity of water?

• Because it is hydrophobic.
• The hydrogen and oxygen ends change in polarity.
• The hydrogen end is slightly negative and the oxygen end is slightly positive.
• The oxygen end is slightly negative and the hydrogen ends is slightly positive.

Which of the following is least likely to dissolve in water?

• sugar which is polar.
• Fats and oils, which are nonpolar.
• Salt made of sodium ion and a chloride ion.
• All of these will easily dissolve in water.

Rohan and Michael are discussing the properties of polar molecules. They agree that polar molecules have unequal sharing of _____ among atoms. What are they referring to?

• protons
• electrons
• neutrons
• monomers

During a science project, Rohan, Maya, and Arjun were asked to draw a water molecule. Which student's drawing best represents a water molecule?

• A. Rohan's drawing
• B. Maya's drawing
• C. Arjun's drawing
• D. Macy,s drawing

During a science experiment, Michael, Aiden, and Oliver noticed that one water droplet stuck to another on the glass slide. What allows one water molecule to stick to another water molecule in this scenario?

• Covalent bond
• Hydrogen bond
• Ionic bond
• Oxygen bond

In the experiment on the properties of water we noticed that the water had an almost bubble shape. When we touched it with a toothpick dipped in soapy water it "exploded" losing its shape. How do you scientifically explain what happened?

• Soapy water, upon contact with water, fix the covalent bonds.
• Soapy water, upon contact with water, breaks the hydrogen bonds.
• Soapy water, upon contact with water, breaks the covalent bonds.
• Soapy water, upon contact with water, fix the hydrogen bonds.

During a science experiment, Abigail poured water on a plastic surface and observed the water molecules sticking to the plastic. What term defines this phenomenon?

• Adhesion
• Polarity
• Cohesion
• Capillarity