Module 6

If a neutral atom loses one electron, what is the electrical charge of the atom? -2 +2 neutral -1 +1

+1

An individual carbon-oxygen bond is polar. Yet carbon dioxide, CO2, which has two carbon-oxygen bonds, is nonpolar because ________. -More than one of the answers is reasonable. -the molecule has an even number of electrons -the electron-pulls of the two oxygen atoms are equal and opposite -it has a greater symmetry

-More than one of the answers is reasonable.

Atoms of metallic elements can form ionic bonds, but they are not very good at forming covalent bonds. Why? -These atoms are too large to be able to come in close contact with other atoms. -Their valence shells are already filled with electrons. -They have a great tendency to lose electrons. -They are on the wrong side of the periodic table.

-They have a great tendency to lose electrons.

How many valence electrons does gallium (Ga, atomic no. = 31) have? 70 1 6 31 3

3

How many substituents (electron domains) are on the following carbon atom? 2 1 None of the answers are correct. 4 3

4

There is more gold in 1 km3 of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans? It is too dilute to separate. All of the answers are correct. It would take too much energy. It would cost too much. None of the answers are correct

All of the answers are correct.

Which of the following bonds would be the most polar? All are equally polar. C-Br C-I C-Cl C-F

C-F

Which of the following molecules has a molecular shape that is linear? O3 All of the molecules are linear. SO2 CO2 H2O

CO2

What is the compound that forms if you react potassium and sulfur? PS2 KS S2P K2S SP

K2S

Which of the following elements has two valence electrons? H Mg Ne Na Li

Mg

List the following bonds in order of increasing polarity: N-N < N-O < H-F < N-F N-N < N-O < N-F < H-F H-F < N-F < N-O < N-N N-O < N-N < N-F < H-F

N-N < N-O < N-F < H-F

Which of the following molecules should have the same molecular shape and approximate bond angles as ammonia, NH3? SO3 PH3 NO2 CH4 BH3

PH3

If the following generic atom were to undergo ionization, what would the most likely product be? +4 -2 The atom would probably not ionize. +1 -3

The atom would probably not ionize.

Which of the following statements is true? The valence shell is usually the most unreactive shell. The valence shell gives us the electron dot structure. The valence shell is the innermost shell. The electron dot structure is made up of each of the valence shells.

The valence shell gives us the electron dot structure.

Polar molecules tend to be ________. diatomic asymmetrical elongated symmetrical

asymmetrical

Which of the following is not a property of metal? conducts electricity is shiny does not conduct heat well All of the answers are properties of metals. is strong, but can be bent

does not conduct heat well

Which of the following is the correct electron dot structure for carbon (atomic no. = 6) d c b a e

e

The source of an atom's electronegativity is the ________. effective nuclear charge repulsive force occurring between electrons within neighboring shells kinetic energy electrons have orbiting the nucleus repulsive force occurring among electrons within the same shell

effective nuclear charge

The neon atom tends NOT to lose any electrons because ________. that would result in a negative ion the ionization energy is so high its electrons are paired together within the same orbitals of its relatively strong effective nuclear charge

of its relatively strong effective nuclear charge

The number of nonbonding pairs in the ammonia molecule is ________. one three four two

one