IB Chemistry 2

Question 1

Which type of bond results from the electrostatic attraction between oppositely charged ions?

Accepted Answer

Ionic bond

Answer

An ionic bond forms when electrons are transferred from one atom to another, creating oppositely charged ions that attract each other.

Question 2

What is the oxidation state of sulfur in H₂SO₄?

Accepted Answer

+6

Answer

In H₂SO₄, hydrogen is +1 (×2) and oxygen is -2 (×4), so sulfur must be +6 for the molecule to be neutral.

Question 3

According to Le Chatelier's principle, increasing pressure on a gaseous equilibrium will shift the equilibrium toward the side with:

Accepted Answer

Fewer moles of gas

Answer

Increasing pressure shifts equilibrium toward the side with fewer moles of gas to reduce the pressure.

Question 4

Which functional group is characteristic of aldehydes?

Accepted Answer

-CHO

Answer

Aldehydes contain the –CHO group, where the carbonyl carbon is bonded to at least one hydrogen atom.

Question 5

What does a negative ΔG value indicate about a chemical reaction?

Accepted Answer

The reaction is spontaneous

Answer

A negative Gibbs free energy change (ΔG < 0) means the reaction is thermodynamically spontaneous under the given conditions.

IB - International Baccalaureate Practice Test