Chemistry Lab Test

List the following atoms in order of increasing electronegativity: S, N, O, P

• P < S < N < O

• P < N < S < O

• O < N < S < P

• O < S < N < P

Which has the highest melting point?

• Fe

• Co

• Mo

• Ti

What charges do Zn, Al, and Ag usually have, respectively?

• +1, +2, +3

• +2, -5, +2

• +2, +3, +1

• +4, +3, +3

How many nearest neighbors does Carbon have in a diamond lattice?

• two

• three

• four

• five

Explain why Lutetium (Lu) is smaller than Yttrium (Y) despite Lutetium having one more energy level.

List the following ions in order of decreasing radius: K+, Ca2+, Sr2+, Rb+

• Rb+ > K+ > Sr2+ > Ca2+

• K+ > Rb+ > Sr2+ > Ca2+

• Sr2+ > Ca2+ > Rb+ > K+

• Ca2+ > Sr2+ > K+ > Rb+

Of the following ions, which has the greatest lattice energy? Explain. MgO, NaF, NaCl

• MgO. The ions have +2 and -2 charges, which makes the force of attraction relatively strong compared to +1 and -1. MgO is also relatively smaller than NaF and NaCl.

• NaF. The ions have +1 and -1 charges, which makes the force of attraction relatively strong compared to +2 and -2. NaF is also relatively smaller than MgO and NaCl.

• NaCl. The ions have +1 and -1 charges, which makes the force of attraction relatively strong compared to +2 and -2. NaCl is also relatively smaller than MgO and NaF.

• NaCl. The ions have +2 and -2 charges, which makes the force of attraction relatively strong compared to +1 and -1. NaCl is also relatively smaller than MgO and NaF.

Which periodic trend does the graph show?

• Ionization energy

• Electronegativity

• Electron affinity

• Atomic radius

In the above graph, why do the values decrease from Be to B and from N to O?

The cubic unit cell of a binary compound that contains gold and oxygen is shown below. What is the empirical formula of the compound?

• Au4O9

• AuO

• Au2O3

• Au2O