Quiz - Ionic and Covalent Compounds | Ionic and Covalent Compounds
Which group typically forms ions with a +2 charge?
Alkali earth metals
Octet rule: Atoms tend to reach an octet in the valence shell and attain a noble-gas configuration
Alkali earth metals (second column in the periodic table) need to lose 2 electrons to attain the nearest noble-gas configuration
Which of the following compounds would you expect to be ionic?
Ionic bonds form between a metal and a nonmetal while covalent bonds form between two nonmetals
What is the formula of the compound formed between magnesium and nitrogen ions?
In order to follow the octet rule: Mg must lose 2 electrons ⇒ Mg2+ and N must gain 3 electrons ⇒ N3-
What is the empirical formula of CH3CH2CH2O-O-CH2CH2CH3?
Empirical formula = the simplest whole-number ratio of atoms in a compound
Which one of the following compounds is chromium (III) oxide?
Chromium (III) = Cr3+, Oxide = O2-
What is the energy of the formation of O2- (g) starting from O (g)?
Coulomb energy of O2-
First electron affinity + second electron affinity of oxygen
Second electron affinity of oxygen
Second ionization of oxygen
O (g) + 1 e- O- (g)
O- (g) + 1 e- O2- (g)
electron affinity = change in energy when an electron is added to the atom to form an anion
How is generally the formation of ionic compounds?
It depends on the starting material
It depends on the reaction conditions
Ionic bond energy = ionization energy (endothermic) + electron affinity (exothermic) + Coulomb energy (exothermic)