Semester 1 test 2024 -2025 AP chemistry

Front

What is the molecular structure of CCl4?

Back

CCl4 (carbon tetrachloride) has a tetrahedral molecular geometry with no double bonds.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of molecules in one mole of a substance.

Front

How do you calculate the number of molecules in a sample?

Back

To calculate the number of molecules, you need the molar mass of the compound and the mass of the sample.

Front

What is the molar mass of zinc (Zn)?

Back

The molar mass of zinc is approximately 65.38 g/mol.

Front

How do you find the mass of a substance from moles?

Back

Mass (g) = Moles x Molar Mass (g/mol). For example, 6.83 moles of Zn = 6.83 x 65.38 g/mol = 446 g Zn.

Front

What is a polar molecule?

Back

A polar molecule has a net dipole moment due to the presence of polar bonds, resulting in a molecule with a positive and a negative end.

Front

Which elements typically have a +1 ionic charge?

Back

Elements like Li, Na, K, and Rb typically have a +1 ionic charge, except for Al which has a +3 charge.

Front

What is the significance of ionic charges in compounds?

Back

Ionic charges determine how elements combine to form compounds and their overall stability.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons.

Front

What is the formula for calculating moles from mass?

Back

Moles = Mass (g) / Molar Mass (g/mol).