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LQB182 MidSem Exam| PREDICTED QUESTIONS| WITH COMPLETE SOLUTIONS
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  • LQB182
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  • Kaplan University

Valance shell Correct Answer: Outermost electron shell and its electrons determine chemical behaviour and bonding Radioactive isotopes Correct Answer: Useful in medical diagnostic tests and in research Atoms can gain or lose electrons Correct Answer: Metals lose electrons and non-metal...

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  • November 3, 2022
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  • 2022/2023
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LQB182 MidSem Exam| PREDICTED QUESTIONS| WITH COMPLETE SOLUTIONS

Valance shell Correct Answer: Outermost electron shell and its electrons determine chemical
behaviour and bonding

Radioactive isotopes Correct Answer: Useful in medical diagnostic tests and in research

Atoms can gain or lose electrons Correct Answer:

Metals lose electrons and non-metals accept Correct Answer:

Anions Correct Answer: negatively charged ions (gain electrons)

Cations Correct Answer: positively charged ions (lose electrons)

Intramolecular bonds Correct Answer: Strong bonds - ionic, covalent, or metallic bonds

Intermolecular bonds Correct Answer: Weak bonds - hydrogen, dipole-dipole, or London
dispersion forces (Van der Waals)

Ionic bonds Correct Answer: electrons are not shared equally. Strong

Covalent bonds Correct Answer: electrons shared equally. Strong

Metallic bonds Correct Answer: metal ions share electrons. Strong

Hydrogen bonds Correct Answer: occurs when a hydrogen atom in one molecule is attracted to
the electrostatic atom in another molecule. Weak

Dipole-dipole Correct Answer: attractions between oppositely charged regions of polar
molecules. Weak

van der Waals forces Correct Answer: fluctuating polarisation of nearby particles that result in a
bond between oppositely charged regions. Weak

Water interacts with: Correct Answer: Other polar molecules, ionic compounds, things with a
charge

Concentration Correct Answer: n = m/M

Water can self ionise Correct Answer: ionises into hydronium ions and hydroxide ions H3O+
(acidic) and OH- (basic)

Energy-in Correct Answer: build things, join elements together (required for covalent bonds)

, Energy-out Correct Answer: when elements break apart (energy released into surrounding
environment)

Organic molecules with high molecular mass: Correct Answer: comprised of multiple molecules
of smaller mass

Polymers link with monomer units linked via: Correct Answer: covalent bonds

Cellular molecules - 4 major classes Correct Answer: proteins, carbohydrates, lipids, DNA/RNA

Polymerisation Correct Answer: a chemical reaction joining monomers in long chains to form a
polymer

Molecule: carbohydrate -> Monomer: Correct Answer: monosaccharide -> Polymer:
polysaccharide

Molecule: protein -> Monomer: Correct Answer: amino acid -> Polymer: polypeptide

Molecule: DNA -> Monomer: Correct Answer: nucleotide -> Polymer: nucleic acid

Lipids are organic molecules BUT: Correct Answer: not true polymers or true macromolecules

Almost all organic compounds contain: Correct Answer: carbon covalently bonded to hydrogen
(C-H)(exception: carbon tetrachloride, urea)

Inorganic compounds don't have: Correct Answer: C-H. i.e. salt, metal, pure elements

Basic proteins contain: Correct Answer: carbon, hydrogen, oxygen, nitrogen and (some) sulphur

Proteins are a chain of: Correct Answer: amino acids joined together linear making a
polypeptide. proteins can consist of one or more polypeptides.

Amino acid structure Correct Answer: H, NH2, COOH bonded to a central carbon and then a
variable R group

R group (side chain) Correct Answer: a functional group that defines folding characteristics,
charge, hydrophobicity

Hydrophobic Correct Answer: water insoluble. non polar

Hydrophobic, how? Correct Answer: Alkyle groups (CH3) give hydrophobic property. >CH3
>hydrophobic

Hydrophilic Correct Answer: water soluble. polar

Hydrophilic R groups Correct Answer: can form hydrogen bonds (O) in alcohols and amides

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