AP Chem Unit 1 Review

Front

What does a larger binding energy in a PES graph indicate?

Back

The closer the electrons are to the nucleus.

Front

How many valence electrons does an unknown element P have if it is given as 2?

Back

2

Front

In a PES graph, how does the binding energy of 1s electrons compare to that of 2s electrons?

Back

1s electrons have a higher binding energy than 2s electrons.

Front

How many isotopes are shown in a mass spectrometry analysis if the answer is 2?

Back

2 isotopes.

Front

What is the empirical formula of chloroform with a percent composition of 10.06% carbon, 0.84% hydrogen, and 89.09% chlorine?

Back

CHCl3.

Front

Define binding energy in the context of PES graphs.

Back

Binding energy is the energy required to remove an electron from an atom.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms.

Front

Explain the concept of isotopes.

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the relationship between ionization energy and binding energy?

Back

Higher binding energy typically indicates higher ionization energy.

Front

How do you calculate the empirical formula from percent composition?

Back

Convert percent to grams, divide by molar mass, and simplify the ratio.