BIOCHEM MODULE 2 SET QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
What is the shape of water? - ANSWER Bent. The bond angle is 104.5 degrees.
What is autoionization, and how is it important for water? - ANSWER Autoionization is the ability of a
compound to react with itself to form ions. One water molecule reacts with a second molecule to form
two ions: H3O+ and OH-. These ions exist in small amounts in pure water and influence the chemistry of
water.
Name the three non-covalent forces discussed in this module - ANSWER 1. Dipole-dipole forces, 2.
Hydrogen bonding, and 3. London dispersion forces
What type of non-covalent interaction is known as the strongest dipole-dipole force? - ANSWER
.hydrogen bonds.
Would the following be a hydrogen donor or acceptor? Or both? - ANSWER .Only a hydrogen acceptor
due to the electrons on the oxygen. It is not a hydrogen donor because the electrons are bonded to a
carbon.
How does the strength of London forces change with increasing molecular weight? Explain briefly. -
ANSWER As molecular weight increase, the strength of London forces also increase. This is due to the
increased number of electrons in larger molecules. The larger number of electrons creates the potential
of stronger temporary dipoles.
Calculate the pH of solution containing 0.12 M of OH-. - ANSWER pH = 13.08
If a solution contains 0.00023M of H+, then what is the OH- concentration? - ANSWER 4.35 X 10-11 M
OH-
If a solution contains 1.67 x 10-8 M OH-, then what is H+ concentration? - ANSWER 5.99 x 10-7 M H+ or 6
X 10-7M
AND ANSWERS WITH SOLUTIONS 2024
What is the shape of water? - ANSWER Bent. The bond angle is 104.5 degrees.
What is autoionization, and how is it important for water? - ANSWER Autoionization is the ability of a
compound to react with itself to form ions. One water molecule reacts with a second molecule to form
two ions: H3O+ and OH-. These ions exist in small amounts in pure water and influence the chemistry of
water.
Name the three non-covalent forces discussed in this module - ANSWER 1. Dipole-dipole forces, 2.
Hydrogen bonding, and 3. London dispersion forces
What type of non-covalent interaction is known as the strongest dipole-dipole force? - ANSWER
.hydrogen bonds.
Would the following be a hydrogen donor or acceptor? Or both? - ANSWER .Only a hydrogen acceptor
due to the electrons on the oxygen. It is not a hydrogen donor because the electrons are bonded to a
carbon.
How does the strength of London forces change with increasing molecular weight? Explain briefly. -
ANSWER As molecular weight increase, the strength of London forces also increase. This is due to the
increased number of electrons in larger molecules. The larger number of electrons creates the potential
of stronger temporary dipoles.
Calculate the pH of solution containing 0.12 M of OH-. - ANSWER pH = 13.08
If a solution contains 0.00023M of H+, then what is the OH- concentration? - ANSWER 4.35 X 10-11 M
OH-
If a solution contains 1.67 x 10-8 M OH-, then what is H+ concentration? - ANSWER 5.99 x 10-7 M H+ or 6
X 10-7M
