IB Chemistry 4

Question 1

What is the molar mass of glucose (C₆H₁₂O₆) in g/mol?

Accepted Answer

180

Answer

Molar mass = 6(12) + 12(1) + 6(16) = 72 + 12 + 96 = 180 g/mol.

Question 2

Which of the following statements about catalysts is correct?

Accepted Answer

Catalysts provide an alternative pathway with lower activation energy

Answer

Catalysts work by providing an alternative reaction pathway with a lower activation energy, increasing reaction rate without being consumed.

Question 3

In acid-base chemistry, what does the term 'amphoteric' mean?

Accepted Answer

Substance that can act as both an acid and a base

Answer

An amphoteric substance can donate or accept protons depending on the reaction conditions; water (H₂O) is a common example.

Question 4

What is the product when an alcohol undergoes dehydration?

Accepted Answer

Alkene

Answer

Dehydration of an alcohol removes water (H₂O) and produces an alkene via an elimination reaction.

Question 5

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

Accepted Answer

Boyle's Law

Answer

Boyle's Law states that P₁V₁ = P₂V₂ at constant temperature, showing an inverse relationship between pressure and volume.

IB - International Baccalaureate Practice Test