Question 1
Which of the following statements about hydrogen bonds is false?
A. Hydrogen bonds create molecules.
B. Hydrogen bonds make biological molecules more stable.
C. Hydrogen bonds are weak interactions.
D. In DNA, hydrogen bonds between nitrogen bonds make the structure more stable.
Question 2
Which Of The Following Statements Is FALSE About Covalent Bonds?
Question 3
Each of the following statements concerning hydrogen bond is true EXCEPT:
A) hydrogen bonds are strong attractive forces between hydrogen atoms and negatively charged atom.
B) hydrogen bonds can occur within a single molecule.
C) hydrogen bonds can form between neighboring molecules.
D) hydrogen bonds are important forces for holding large molecules.
Answer to question 1
The answer is A. Hydrogen bonds create molecules.
The other given statements are true about hydrogen bonds. The hydrogen bonding in some biological molecules such as DNA and protein helps in stabilizing the molecule. For a DNA molecule, the hydrogen bonding of the nitrogenous bases plays a role in maintaining the stability of the structure. The hydrogen bonds are also considered as weak interactions compared to covalent bonds.
The false statement in the given choices is that hydrogen bonds create molecules. The covalent bond is the specific bond that is used to create molecules. Hydrogen bond is just an interaction for selected molecules and cannot create a specific molecule solely from hydrogen bonding.
Answer to question 2
Question 10: option c is false
Polar covalent bonding is a type of chemical bond where a pair of electrons is unequally shared between two atoms.
Question 11: option e should be the answer as all the given statements are correct.
Answer to question 3
The statement that is not true is (A): hydrogen bonds are strong attractive forces between hydrogen and a negatively charged atom.
There are two issues with this statement. Firstly, hydrogen bonds, while they are attractive forces, are not strong bonds. They are not as strong as either ionic or covalent bonds. They are, however, stronger than Van der Waals forces.
Secondly, the atom bonded to hydrogen simply needs to be more electronegative than hydrogen, not necessarily negatively charged. Statement A is more applicable to an ionic bond.
Regarding the other options, hydrogen bonds can be either intermolecular (between molecules, such as a molecule and water) or intramolecular (within the same molecule). Hydrogen bonds are important in maintaining the three-dimensional structures of both proteins and nucleic acids.