chemistry questions

in 100 words or more each answer the 6 questions with references and in text citations.

1. 1.       What is the definition of a "mole" of a substance? Why is the mole a convenient quantity to use in chemistry?
2. 2.       Why is it important to know and classify various chemical reactions? Provide examples of at least three different chemical reactions you encounter in your life
3. 3.       Hi all, I am thinking what does Avogadro's number mean.  I will look forward to hear from you all on this.
4. 4.       Hi all, I am thinking what type of chemical reaction will be rusting of iron nails.  I will look forward to hear from you all on this.
5. 5.       A mole is a quantity of a substance that is equal to exactly 12 grams of 12C.  The molar mass of a substance is the weight of a mass in 1 gram of a mole of that substance.  The mole provides "a specific measurement for the number of atoms or molecules in a bulk sample of matter" (Flowers et. al.).  The mole is used as a conversion factor for Avogadro's number, 1 gram= 6.022 x 1023 amu. It is a method of measuring in larger quantities of atoms at a time.
6. 6.       Hi all, the product of a chemical reaction would have to have an equal amount as the reactants that created it, but I used to get stuck and not know where to add a number to balance the equations. Now it makes a lot more sense to me. Although the chemical reacts with each other to produce a different element, the atoms could not produce different kinds of atoms. The new substance uses the same atoms from the original, it just moves places and attaches to different atoms (the same atoms from the reactants). It really helped me to see the equation broken down and to see the pictures representing the equation.