Question 1(Multiple Choice Worth 3 points)

Question

(02.01 LC)

The diagram below illustrates a network of water molecules bonded together. The solid lines represent the bonds between the oxygen atom and hydrogen atoms that form a water molecule. The oxygen atom has a partial negative charge, while the hydrogen atoms have a partial positive charge. A single water molecule forms when one oxygen atom and two hydrogen atoms have an uneven sharing of electrons.

Five H two O molecules are shown. There are dashed lines between the H of one molecule and the O of another. There are two solid lines inside each molecule between the O and each H. The oxygen atom has a partial negative charge while the hydrogen atoms have a partial positive charge.
© J:136401 2014
Creative Commons, CC BY-SA 3.0

Which of the following statements describes the bond formation between the water molecules?

A hydrogen bond forms between the partially negative oxygen atom of one water molecule and the partially positive hydrogen atom of a neighboring water molecule.
A polar covalent bond forms between the partially negative oxygen atom of one water molecule and the partially positive hydrogen atom of a neighboring water molecule.
An ionic bond forms between the partially positive oxygen atom of one water molecule and the partially negative hydrogen atom of a neighboring water molecule.
An oxygen bond forms between the partially positive hydrogen atom of one water molecule and the partially negative hydrogen atom of a neighboring water molecule.
Question 2(Multiple Choice Worth 3 points)
(02.01 HC)

A student completes an investigation on the properties of water. The student pours one pipette of water into one empty test tube and one pipette of isopropyl alcohol (rubbing alcohol) into another empty test tube. The student records at four minutes that the isopropyl alcohol has completely evaporated from the test tube. In the same amount of time, less than 1 mL of water has evaporated from the test tube. What can the student infer about water's ability to moderate temperature based on the results of this investigation?

Water is worse at regulating temperature than isopropyl alcohol because it absorbs energy and evaporates at a much faster rate.
Water is better at regulating temperature than isopropyl alcohol because it absorbs energy and evaporates at a much slower rate.
Both water and isopropyl alcohol regulate temperature at the same rate, regardless of how fast or slowly they absorb energy and evaporate.
Neither water nor isopropyl alcohol efficiently regulates temperatures because they both eventually evaporate.
Question 3(Multiple Choice Worth 3 points)
(02.01 LC)

Water has many properties that support life on Earth. Which property allows water to have surface tension, which causes water to form almost an invisible film strong enough for light insects to walk across its surface?

Cohesive behavior
High heat of vaporization
Universal solvent
Expansion when freezing
Question 4(Multiple Choice Worth 3 points)
(02.01 LC)

Water is often called the universal solvent because many different substances dissolve well in water. Which of the following substances would dissolve in water?

Salts and fats
Salts and sugars
Waxes and oils
Waxes and sugars

Answer 1

Here are the answers to your questions:

Question 1: The correct answer is: A hydrogen bond forms between the partially negative oxygen atom of one water molecule and the partially positive hydrogen atom of a neighboring water molecule.

Question 2: The correct answer is: Water is better at regulating temperature than isopropyl alcohol because it absorbs energy and evaporates at a much slower rate.

Question 3: The correct answer is: Cohesive behavior.

Question 4: The correct answer is: Salts and sugars.

If you have any more questions or need further explanations, feel free to ask!