hesi a2 water biology
What does polarity allow water to do?
transport molecules
Which of these is NOT true for the polarity of a water molecule?
A partial negative charge is on the hydrogen atom. The polar covalent bond between oxygen and hydrogen results in a partial positive charge on the hydrogen atom and a partial negative charge on the oxygen atom.
Which property of water is mainly responsible for water getting sucked up in a straw?
Adhesion
Which of these defines adhesion?
Attraction of molecules of one substance to molecules of another substance
Which atoms CANNOT bond to hydrogen by hydrogen bonding?
Carbon
Which property of water is responsible for its surface tension and the ability to form droplets?
Cohesion
The hydrogen atoms in a water molecule are linked to the oxygen atom by a(n) __________.
Covalent bond
3. Which property of water allows it to absorb and store a significant amount of heat without a drastic change in temperature?
High specific heat capacity
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.
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
Which of these is NOT true about cohesion?
It is seen in gases.
Which of these molecules cannot dissolve in water, due to the presence of hydrogen bonding?
Lipid
Which of these is an example of cohesion?
Movement of water in the xylem
1. What is the atomic structure of a water molecule?
One oxygen atom and two hydrogen atoms
Which of these is responsible for cohesion in water?
Polarity
Polarity allows water to be a good __________.
Solvent, and other polar substances can be dissolved in water easily
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
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.
Why is ice less dense than liquid water?
The hydrogen bonds in ice create a regular hexagonal structure, leading to increased intermolecular spacing.
2. 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 of these is TRUE for the ability of ice to float on water?
The water molecules are less dense in ice than in water.
Why does water need more specific heat to increase its temperature?
To break hydrogen bonds
The polarity of a water molecule is due to the __________.
Uneven distribution of partial charges Polarity in a water molecule is due to the uneven distribution of partial charges. A slight positive charge on one atom (hydrogen) and a slight negative charge on the other atom (oxygen) makes the molecule polar.
Polarity makes water a good solvent in which a wide range of substances can dissolve. This property helps in transporting substances. For example, minerals get dissolved in water and are transported in the xylem of plants.
Water cannot destroy toxins. It can dissolve toxins and excrete them out of the body. Water cannot synthesize substances. Polarity allows ions to dissolve in water, not repel them.
Which property of hydrogen results in the formation of a hydrogen bond with an electronegative atom?
Weak positive charge
What is the correct number of atoms in one molecule of water?
2 Hydrogen and 1 Oxygen
How many hydrogen bonds can one water molecule form?
4
