Write the formula for each of the four compounds named below.  Enumerate your responses.

1.  dinitrogen tetrasulfide

2.  lead(IV) oxide

3.  calcium fluoride

4.  sodium hydrogen carbonate

Identify each of the following compounds as ionic or molecular.

An ion contains 54 electrons after its atom gained 1 electron to form a stable electron structure.  

a. What is the name of this ion?

b. What is the symbol of this ion?

What does the following WHMIS symbol represent?

What does this WHMIS symbol represent?

List three lab safety rules and explain why each rule should be followed.

What is the mass in grams of a 2.10 mol sample of lithium nitride, Li₃N?

You MUST

 show all

work starting with the calculation of molar mass, followed by the formula with variables from the VVS course (and

rearrangement if needed), then the substitution of values

into the formula, then the calculated answer.  You then need to remember

to include units and use correct significant digits in your final answer. 

Responses only showing the final answer will receive a zero grade.

Note, to show division please use the

"slash" symbol on your keyboard under the question

mark.  

For example, 4/8 = 0.5

How many moles are in a 61 g sample of zinc fluoride, ZnF₂?  

You MUST show all work starting with the calculation of molar mass, followed by the formula with variables from the VVS course (and rearrangement if needed) to determine moles, then the substitution of values into the formula, then the calculated answer.  You then need to remember to include units and use correct significant digits in your final answer.  Responses only showing the final answer will receive a zero grade.

Note, to show division please use the "slash" symbol on your keyboard under the question mark.  

For example, 4/8 = 0.5