Q1. For each of the following, predict the chemical formula of the binary ionic

compound they form. Show all your steps as we did in the examples above (using

either the method in examples 1&2 or the "criss-cross" method) and check to make

sure the charges balance. Name each compound (some of the names are given).

1. lead (II) iodide

2. potassium and iodine

3. calcium and chlorine

4. lithium and oxygen

5. zinc with a +2 charge and oxygen

6. silver with a +1 charge and chlorine/nQ2. Classify each of the following as an endothermic or exothermic process and

explain your choice:

1. Melting ice

2. Water evaporating

3. When iron is oxidized and forms iron oxide (rust) it gives off heat.

4. The gas expands in the coils of an air conditioner making them cold to

the touch.

5. The burning of a gasoline and air mixture in an automobile engine.

Q3. Provide your own examples, other than the ones given in this lesson, of an

exothermic and an endothermic process and explain./nQ4. What is the balanced equation for the reaction of N₂ and H₂ to form NH₂? What

type of reaction is this?

Q5. Click on the "Separate Water" option button on the top right of the applet.

Follow the same steps to balance this equation. What is the balanced equation for

the reaction of "H₂O" to form "H₂" and "O₂"? What type of reaction is this?