AP Chemistry First Semester Review

Front

64 g of methanol (32 g mol^-1) is added to 36 g of water. What is the mole fraction of methanol in the solution?

Back

0.50

Front

A compound contains 1.58 g carbon and 8.42 g sulfur. What is the empirical formula of the compound?

Back

CS₂

Front

What is the electron configuration for an atom of phosphorus?

Back

1s²2s²2p⁶3s²3p³

Front

Which of these atoms has the smallest atomic radius? K, Mg, Si, O

Back

O

Front

Which of these has the lowest first ionization energy? K, Mg, Si, O

Back

K

Front

How many relatively low ionization energy values does carbon have?

Back

4

Front

Which of the following combinations is most likely to form an ionic bond: nitrogen and oxygen, phosphorus and fluorine, boron and nitrogen, rubidium and oxygen?

Back

rubidium and oxygen

Front

Which of the following has the lowest melting point? NaF, NaI, CaO, MgI₂

Back

NaI

Front

Which of the following does not have a lone pair on the central atom?
NH₃,
BF₃,
PF₃,
SF₄

Back

BF₃

Front

Which of the following has a trigonal pyramidal molecular geometry?
BF₃,
NH₄⁺,
PCl₃,
PF₅

Back

PCl₃