AP Chem Unit 1

Front

What is the ionic formula for lead(II) nitrate?

Back

Pb(NO3)2

Front

What is the formula for the binary ionic compound: aluminum sulfide?

Back

Al2S3

Front

If an element has two isotopes, one with a mass of 40.0 amu that is 75% abundant and an average atomic weight of 40.50 amu, what is the isotopic mass of the other isotope?

Back

42.0 amu

Front

How do you calculate the number of particles in a given mass of a substance?

Back

Use the formula: Number of particles = (mass in grams / molar mass) x Avogadro's number.

Front

What is ionization energy?

Back

The energy required to remove an electron from an atom or ion.

Front

What is the trend of ionization energy across a period in the periodic table?

Back

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

Front

What is the trend of ionization energy down a group in the periodic table?

Back

Ionization energy generally decreases down a group due to increased distance from the nucleus and increased shielding.

Front

What is effective nuclear charge?

Back

The net positive charge experienced by an electron in a multi-electron atom.

Front

What is the relationship between ionization energy and atomic radius?

Back

As atomic radius decreases, ionization energy increases because electrons are held more tightly by the nucleus.

Front

What is the significance of isotopes in chemistry?

Back

Isotopes are atoms of the same element with different numbers of neutrons, affecting their mass and stability.