Water Questions

HESI A2 - Biology

What is the atomic structure of a water molecule?

One oxygen atom and two hydrogen atoms

Which of the following best describes the polarity of a water molecule?

The oxygen atom has a negative charge, and the hydrogen atoms have a positive charge.

Which property of water allows it to absorb and store a significant amount of heat without a drastic change in temperature?

Low specific heat capacity

Which property of water is responsible for its surface tension and the ability to form droplets?

Adhesion

Why is water considered a versatile solvent in biological and chemical processes?

It has a polar nature and can dissolve a wide range of substances

Why is ice less dense than liquid water?

The hydrogen bonds in ice create a regular hexagonal structure, leading to increased intermolecular spacing.

The hydrogen atoms in a water molecule are linked to the oxygen atom by a(n) __________.

Covalent bond

The  polarity of  a water molecule is due to the __________.

Uneven distribution of partial charges

Which of these is NOT true for the polarity of a water molecule?

A partial negative charge is on the hydrogen atom.

Polarity allows water to be a good __________.

Solvent

What does polarity allow water to do?

Transport molecules

Which atoms CANNOT bond to hydrogen by hydrogen bonding?

Carbon

Which property of hydrogen results in the formation of a hydrogen bond with an electronegative atom?

Weak positive charge

How many hydrogen bonds can one water molecule form? 

4

Which of these molecules cannot dissolve in water, due to the presence of hydrogen bonding? 

Lipid

Which of these defines specific heat?

The amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius

Why does water need more specific heat to increase its temperature?

To break hydrogen bonds

Which of these is NOT true about cohesion?

Cohesion only occurs in solids and is absent in liquids and gases.

Which of these is responsible for cohesion in water?

Polarity

Which of these is an example of cohesion?

Movement of water in the xylem

Which of these defines adhesion? 

Attraction of molecules of one substance to molecules of another substance

Which property of water is mainly responsible for water getting sucked up in a straw?

Adhesion

Which of the following correctly explains how hydrogen bonding allows for ice to float on water?

The hydrogen bonding in ice makes it less dense than water.

Which of these is TRUE for the ability of ice to float on water?

The water molecules are less dense in ice than in water.

Which of the following correctly describes a difference between hydrogen bonding in water and ice?

Hydrogen bonding leads to a lattice-like structure in ice.