AP Chemistry MCQ Unit 1-2

Front

What is the molar mass of Carmustine (C5H9Cl2N3O2)?

Back

The molar mass of Carmustine is 214.05 g/mol.

Front

How do you calculate the mass of a substance from the number of atoms?

Back

Use the formula: mass = (number of atoms / Avogadro's number) * molar mass.

Front

What is the electron configuration of Atom A?

Back

Atom A: 1s² 2s² 2p⁶ 3s².

Front

Which atom has the largest fourth ionization energy: Atom A, Atom B, or Atom C?

Back

Atom B has the largest fourth ionization energy.

Front

What is the relationship between bond length and bond order?

Back

Shorter bond lengths generally indicate higher bond orders.

Front

Which ion has a larger radius: Na⁺ or Mg²⁺?

Back

Na⁺ has a larger radius than Mg²⁺ due to fewer protons attracting the same number of electrons.

Front

What is the electron configuration for Mn²⁺?

Back

The electron configuration for Mn²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵.

Front

What is the significance of Avogadro's number in chemistry?

Back

Avogadro's number (6.022 x 10²³) is used to convert between moles and number of particles.

Front

What is the difference between HCO₃⁻ and CO₃²⁻ in terms of bond length?

Back

HCO₃⁻ has a shorter C-O bond length compared to CO₃²⁻.

Front

How does ionization energy change across a period in the periodic table?

Back

Ionization energy generally increases across a period due to increasing nuclear charge.