Answer these questions before class on Wednesday, January 12th. Be sure to review these notes before answering.

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First Name: Last Name:

Laboratory Section:

1. A sample of the metal molybdenum contains only atoms. What is the formula for molybdenum?

2. A sample of phosphorus consists of molecules. Each of the molecules contains four phosphorus atoms. What is the symbol for the element phosphorus? What is the formula for the element phosphorus? (Note it is a little difficult to do subscripts so a formula like Br2 will have to be written Br2.)

3. Here is a picture of a sulfur molecule

What is the formula for sulfur?

4. The formula for one kind of sugar is C6H12O6.

How many carbon atoms in this sugar?

How many hydrogen atoms in this sugar?

How many oxygen atoms in this sugar?

How many oxygen molecules in this sugar?

5. What is the formula of a compound that has two hydrogen atoms and two oxygen atoms? (Note it is a little difficult to do subscripts so a formula like MgCl2 will have to be written MgCl2.)

Can you name this compound?

6. What is a pure substance?