Chapter 4: Calculations and the Chemical Equation

Question 1

A practical unit for defining a collection of atoms is the ______.

Answer 1

mole (mol)

Question 2

1 mole of atoms= __________

aka Avogadros Number

Answer 2

6.022 x 10^23

Question 3

What are the 4 (5) types of chemical reactions?

Answer 3

1. combination: the joining of two or more elements or compounds
2. decomposition: the reverse of combination
3. single- replacement: one atom replaces another in the compound to produce a new compound
4. double- replacement: two compounds undergo a change of partners
   (5) . combustion: reactions with oxygen that generally release energy (organic compounds CO2 and H2O are usually the products)