Quiz - Ionic and Covalent Compounds | Ionic and Covalent Compounds
General Chemistry 1 - Quiz - Ionic and Covalent Compounds
Which group typically forms ions with a +2 charge?
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)?
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?
Ionic bond energy = ionization energy (endothermic) + electron affinity (exothermic) + Coulomb energy (exothermic)