Lesson 22: Chapter 22 Bonding in Ionic Compounds

What would be the chemical formula of the ionic compound between calcium and bromine? A. CaBr B. Ca2Br2 C. Ca2Br D. CaBr2

CaBr2

What would be the name of this ionic compound? A. Calcium Bromide B. Bromine Calcium C. Calcium Bromine D. Bromide Calcium

Calcium Bromide

Which of the following would best describe the room temperature characteristics of the magnesium oxide? A. Brittle, opaque, solid. B. Electrically conducting alloy. C. Transparent gas. D. A malleable solid. E. Brittle, transparent, electrically non-conducting solid.

brittle, transparent, electrically non-conducting solid

What happens to the energy of the Mg and Cl atoms as this compound is formed? A. the energy decreases B. the energy remains the same C. the energy increases

the energy decreases

What happens to the overall entropy in the universe as this compound is formed? A. The entropy decreases. B. The entropy remains the same. C. The entropy increases.

the entropy increases

What happens to the valence electrons as the product (MgO) is formed? A. The orbitals spread out into the whole solid and overlap. B. The magnesium atoms' valence electrons are effectively transferred to oxygen. C. The oxygen atoms' valence electrons are effectively transferred to magnesium. D. The orbitals of both atoms' valence electrons change shape so that the electrons are shared equally between the atoms. E. The electrons move to new orbitals that are higher in energy than the individual atomic orbitals.

the magnesium atoms' valence electrons are effectively transferred to oxygen

What is the charge of iron (Fe) in the compound Fe2O3? Select one: A. -3 B. -2 C. +2 D. +3

+3

What would be the charge of bromine, Br, in order to satisfy the octet rule?

-1

How many electrons does Cl want to gain?

1

How many electrons would potassium, K, need to get rid of to satisfy the octet rule?

1

Now ask yourself how many metals atoms (potassium) are needed to give all of the electrons that the nonmetal atoms (sulfur) want to take?

2

In the following questions you will be asked to provide some details of the chemical processes involved in a reaction between magnesium and oxygen. How many more electrons does unbound oxygen need to fill its 2nd shell? (You may find it helpful to draw the energy well on scratch paper.) A. 1 B. 2 C. 6 D. 8 E. None, the 2nd shell is full.

2

How many nonmetals atoms (bromine) are needed to take all of the electrons that the metal atoms (calcium) want to give? A. 1 Bromine atom, 1 Calcium atom B. 2 Bromine atoms, 2 Calcium atoms C. 1 Bromine atom, 2 Calcium atoms D. 2 Bromine atoms, 1 Calcium atom

2 Bromide atoms, 1 Calcium atom

Which of the following is a correct and balanced equation showing the reaction of calcium and oxygen? (While several of the equations may be balanced, only one has the correct products and reactants as well as being correctly balanced.) A. Ca + O2 = CaO B. Ca + O2 = CaO2 C. 2Ca + O2 = 2CaO D. 4Ca + O2 = 2Ca2O E. Ca + O2 = Ca2O

2Ca + O2 = 2CaO

What would be the charge of calcium, Ca, in order to satisfy the octet rule?

+2

Given your answer to the previous question, predict how many electrons Mg would be expected to lose in ionic compounds. Hint: how many are lost to form a stable noble gas electron configuration, ns22np66 (octet rule)? A. Zero B. One C. Two D. Three

two

How many electrons would sulfur need to gain to satisfy the octet rule?

2

What happens to the entropy of the universe as the products are formed? A. The total entropy stays the same. B. Thermal energy is converted into electromagnetic energy resulting in a decrease in total entropy. C. Chemical bonds are formed resulting in a decrease in total entropy. D. Chemical potential energy is converted into kinetic energy resulting in a decrease in entropy. E. Chemical potential energy is converted into thermal energy resulting in an increase in entropy.

chemical potential energy is converted into thermal energy resulting in an increase in entropy