Chemical Bonds Review

When an atom of sodium and an atom of fluorine combine to form the salt, sodium fluoride, an ionic bond is formed. Which statement correctly describes the behavior of the valence electron in the ionic bond?

• An electron from the fluorine atom moves to the sodium atom forming two ions.

• An electron from the sodium atom moves to the fluorine atom forming two ions.

• An electron from the fluorine atom is shared with the sodium atom forming a sodium ion.

• An electron from the sodium atom is shared with the fluorine atom forming a fluoride ion.

The reason salt crystals, such as KCl, hold together so well is because the cations are strongly attracted to

• neighboring cations.

• the protons in the neighboring molecules.

• free electrons in the crystals.

• neighboring anions.

Metals and nonmetals generally form ionic bonds with each other. Which of the following sets of elements will most likely for an ionic bond?

• Na, F

• Cl, F

• Na, K

• He, O

Which of the following pairs of atoms is unlikely to form a compound?

• potassium (K) and iodine (I)

• calcium (Ca) and chlorine (Cl)

• iron (Fe) and sulfur (S)

• neon (Ne) and argon (Ar)

How many different elements are in the compound sodium carbonate (Na2CO3)?

• 1

• 3

• 6

• 7

Limestone is a naturally occurring form of calcium carbonate. The correct formula for limestone is

• Ca(CO3)2.

• CaCO3

• Ca2CO3.

• Ca2(CO3)2.

Soda ash, or sodium carbonate, is used in glassmaking. It is composed of sodium ions and carbonate ions. Which of the following is the chemical formula of sodium carbonate?

• NaCO3

• Na2CO3

• Na2C2O6

• Na(CO3)2

What is the correct name for the compound with the chemical formula (NH4)(NO3)?

• ammonium nitrate

• hydro-nitrogen oxide

• ammonia nitrite

• nitro-hydrogen nitrate

Oxygen (O) atoms have six valence electrons and beryllium (Be) atoms have two valence electrons. Which of the following is the correct formula for a compound made of oxygen and beryllium?

• BeO

• BeO2

• BeO2

• Be2O6

Which of the following is the formula for ammonium hydroxide?

• Al2O3

• AmO2

• (NH3)(OH)

• (NH4)(OH)