AP Chemistry Unit 2 Flashcard

Front

What is the VSEPR shape of PCl5?

Back

trigonal bipyramidal

Front

Bond enthalpy is __________.

Back

always positive

Front

The ability of an atom in a molecule to attract electrons is best quantified by the ______.

Back

electronegativity

Front

A valid Lewis structure of _______ cannot be drawn without violating the octet rule.

Back

IF3

Front

How many sigma and pi bonds are there in C2H2? (the structure will be ordered HCCH)

Back

3 sigma and 2 pi

Front

What is the octet rule?

Back

Atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.

Front

Define electronegativity.

Back

The tendency of an atom to attract electrons in a chemical bond.

Front

What is a sigma bond?

Back

A sigma bond is a type of covalent bond formed by the direct overlap of atomic orbitals.

Front

What is a pi bond?

Back

A pi bond is a type of covalent bond formed by the side-to-side overlap of p orbitals.

Front

What is the difference between sigma and pi bonds?

Back

Sigma bonds are formed by head-on overlap and are stronger, while pi bonds are formed by side-to-side overlap and are generally weaker.