Name: __________________________________
Period: ______
Supplemental Worksheet
Read Section 4.3 in your textbook for more help in naming compounds and formulas.
Naming Ionic Compounds
When an atom gains one or more electrons, it becomes an “anion” with a negative charge. The name of
the ion has the last 3 letters replaced with “IDE” (Chlorine  Chloride, for example).
When an atom loses one or more electrons, it becomes a “cation” with a positive charge. The name of
the ion stays the same. (Sodium is still called Sodium, even when it is a cation).
Example: What is the name of the compound formed when Cesium reacts with Iodine?
Cesium is still called “Cesium.”
Iodine becomes “Iodide.”
Answer: Cesium Iodide
Name the rest of these formulas:
1.
2.
3.
4.
5.
Sodium reacts with Fluorine: ________________________
Potassium reacts with Bromine: _______________________
Rubidium reacts with Chlorine: _______________________
Cesium reacts with Fluorine: ______________________
Lithium reacts with Chlorine: _______________________
Example: What is the chemical formula that results when Potassium (an alkali metal) reacts with
Chlorine (a halogen)?
Potassium has a +1 charge. K+
Chloride has a -1 Charge. ClOnly one of each is required to make a neutral compound.
Answer: KCl
Identify the chemical formulas in this list:
1.
2.
3.
4.
5.
Lithium reacts with Iodine: ________
Cesium reacts with Fluorine: ________
Potassium reacts with Chlorine: _______
Sodium reacts with Iodine: _____
Rubidium reacts with Bromine: _____
Example: What is the chemical formula that results when Magnesium (an alkali earth metal) reacts
with Chlorine (a halogen)?
Magnesium has a +2 charge. Mg2+
Chloride has a -1 charge. Cl2 Chloride ions are required to balance the charge of the Magnesium ion.
Answer: MgCl2 (magnesium chloride)
Name: __________________________________
Period: ______
Identify the chemical names and formulas in this list:
1.
2.
3.
4.
5.
Beryllium reacts with Iodine: formula: ________ name: _________________________
Magnesium reacts with Bromine: formula: ________ name: _________________________
Calcium reacts with Fluorine: formula: ________ name: _________________________
Strontium reacts with Iodine: formula: ________ name: _________________________
Barium reacts with Chlorine: formula: ________ name: _________________________
Example: What do you get when Calcium reacts with a polyatomic ion, like hydroxide, OH-?
Calcium, Ca2+ has a +2 charge.
Hydroxide, OH- has a -1 charge.
It takes 2 hydroxides to balance the +2 charge of the Calcium.
Answer: Ca(OH)2 (Calcium hydroxide)
Identify the chemical names and formulas in this list:
1.
2.
3.
4.
5.
Sodium reacts with hydroxide: formula: ________ name: _________________________
Magnesium reacts with hydroxide: formula: ________ name: _________________________
Rubidium reacts with cyanide, CN-: formula: ________ name: _________________________
Calcium reacts with nitrate, NO3-: formula: ________ name: _________________________
Barium reacts with sulfate, SO42- : formula: ________ name: _________________________
Example: What do you get when a transition metal, like Copper, reacts with oxygen?
Copper can have a +1 or +2 charge as an ion.
Oxygen becomes O2- as an ion called Oxide.
One copper ion of charge +2 is required for each oxide ion of charge -2 for a neutral compound.
But two copper ions of charge +1 are required for each oxide ion for a neutral compound.
Answer: CuO, (For Cu+), or Cu2O for (Cu2+). These CANNOT both be called “Copper Oxide” though.
Solution: Let’s call Cu+ by the name Copper (I) and Cu2+ by the name of Copper (II).
Answer: CuO is called Copper (II) Oxide
Identify the chemical names and formulas in this list:
1.
2.
3.
4.
5.
Iron (III), Fe3+ reacts with chlorine: formula: ________ name: _________________________
Chromium (II), Cr2+ reacts with hydroxide: formula: ________ name: __________________
Titanium (IV), Ti4+ reacts with oxygen: formula: ________ name: ____________________
Ni2+ reacts with Sulfite (SO32-) formula: ________ name: _________________________
Cd2+ reacts with Carbonate (CO32-) formula: ________ name: _________________________
You are also responsible for understanding how covalent compounds are named.
Example: What do you call the formula N2O4? Answer: Dinitrogen Tetroxide (refer to page 126)
What is this compound called?
1. P2Cl3 :
2. CO2 :
name: _________________________
name: _________________________