Ch. 22

What is the charge of iron (Fe) in the compound Fe2O3?

+3

How many more electrons does unbound oxygen need to fill its 2nd shell?

2

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.)

2Ca + O2 = 2CaO

Electrolytes

A chemical compound that ionizes when dissolved in water to produce an electrically conductive medium

Which of the following would best describe the room temperature characteristics of the magnesium oxide?

Brittle, transparent, electrically non-conducting solid.

Which of the following ionic compounds is most likely to be colored (use the periodic table)?

HgS

What happens to the valence electrons as the product (MgO) is formed?

The magnesium atoms' valence electrons are effectively transferred to oxygen.

Ionic Compound

a compound formed between a metal and a non-metal. Ionic compounds are crystaline solids at room temperature. They conduct electricity when molten or dissolved in water

Octet Rule

an atom will most likely form an ion that has the ns2np6 configuration of the closest noble gas atom

salts

another name for ionic compounds

When sodium (Na) and Chlorine (Cl) form table salt (NaCl) the chlorine atoms

become negatively charged chlorine ions

Ionic Bonding

model used to explain bonding in ionic compounds, metal atoms lose electrons forming positive ions and non-metal atoms gain electrons forming negative ions, high melting points

What happens to the entropy of the universe as the products are formed?

Chemical potential energy is converted into thermal energy resulting in an increase in entropy.