BS Bachelor of Science: Life, Physical, and Chemical 4

Question 1

What is the oxidation state of sulfur in H₂SO₄ (sulfuric acid)?

Accepted Answer

+6

Answer

In H₂SO₄, with H at +1 and O at -2, sulfur must be +6 to balance the overall neutral charge.

Question 2

Which type of chemical reaction involves one element replacing another element in a compound?

Accepted Answer

Single displacement

Answer

In a single displacement reaction, a more reactive element displaces a less reactive element from a compound.

Question 3

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

Accepted Answer

Fewer moles of gas

Answer

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

Question 4

Which quantum number describes the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number (l)

Answer

The angular momentum quantum number (l) determines the shape of the orbital (s, p, d, or f).

Question 5

A buffer solution resists changes in pH by containing which combination of components?

Accepted Answer

A weak acid and its conjugate base

Answer

A buffer contains a weak acid and its conjugate base (or weak base and conjugate acid), which neutralize added acid or base.

BS - Bachelor of Science Practice Test