IB CH: 2 Molecular Biology Exam
Questions & Answers.
Water molecule - CORRECT ANSWER A polar molecule made of 1 oxygen and 2 hydrogen atoms.
Polarity - CORRECT ANSWER Having positively & negatively charged areas because of an uneven
distribution of electrons.
Hydrogen bond - CORRECT ANSWER A weak bond formed between polar water molecules.
Cohesion of water molecules is high - CORRECT ANSWER because H-bonds make water molecules attract
each other more strongly. It causes surface tension.
Water has high specific heat capacity - CORRECT ANSWER because some heat is used to break H-bonds
so more is needed to raise the temperature.
Water is an excellent solvent - CORRECT ANSWER because polar water molecules dissolve so many
substances.
Water has dipolarity - CORRECT ANSWER because water molecule contains both positve and negative
charges.
Water is a good coolant in sweat - CORRECT ANSWER because it has a high specific heat.
Water is good for transport - CORRECT ANSWER because it can easily dissolve glucose, sodium chloride,
oxygen, and many amino acids.
Organic chemistry - CORRECT ANSWER chemistry of carbon compounds
Questions & Answers.
Water molecule - CORRECT ANSWER A polar molecule made of 1 oxygen and 2 hydrogen atoms.
Polarity - CORRECT ANSWER Having positively & negatively charged areas because of an uneven
distribution of electrons.
Hydrogen bond - CORRECT ANSWER A weak bond formed between polar water molecules.
Cohesion of water molecules is high - CORRECT ANSWER because H-bonds make water molecules attract
each other more strongly. It causes surface tension.
Water has high specific heat capacity - CORRECT ANSWER because some heat is used to break H-bonds
so more is needed to raise the temperature.
Water is an excellent solvent - CORRECT ANSWER because polar water molecules dissolve so many
substances.
Water has dipolarity - CORRECT ANSWER because water molecule contains both positve and negative
charges.
Water is a good coolant in sweat - CORRECT ANSWER because it has a high specific heat.
Water is good for transport - CORRECT ANSWER because it can easily dissolve glucose, sodium chloride,
oxygen, and many amino acids.
Organic chemistry - CORRECT ANSWER chemistry of carbon compounds
