Elements and
Compounds
Lesson 2
Elements v. Compounds
Element – Oxygen
Compound – Carbon Dioxide
The Letters of Life
 Just like words are made up of letters, compounds are
made up of elements
Water
Baking Soda
Capsaicin
Sugar
Gun Powder
Chips!
Questions
 What is an element?
 What is a compound?
Pure Substance??
Matter
Pure Substance
Element
Compound
Mixture
Naming Chemicals and
Formulas
Why would it be confusing if everyone used
different names for chemicals?
IUPAC
 International Union of Pure and Applied Chemistry
 The symbols for the elements were the First Letter of
the elements name.
 When they used that letter the next element stating
with the same name used a lower case letter.
Periodic Table
Questions
 Why is the Symbol “C” used for Carbon and not for
Calcium?
 Why is the symbol for lead “Pd” and not “Le”?
Writing/Reading
Chemical Formulas
H2O(l)
Two Hydrogen
One Oxygen
Liquid
Compound
Name
Common Use
Chemical
Formula
Calcium
carbonate
Chalkboard
chalk
CaCO3(s)
Sodium
phosphate
Heavy-duty
cleaner
Na3PO4(s)
Magnesium
chloride
De-icing roads
MgCl2(s)
Monosodium
glutamate
(MSG)
Food seasoning
NaC5H8NO4(s)
Hydrogen
peroxide
Bleach and
disinfectant
H2O2(l)
Glucose
Sugar
C6H12O6(s)
Carbon dioxide
Fizz in pop, dry
ice
CO2(g)
Freon-12
Refrigerator
coolant
CCl2F2(g)
Number and
Name of
Elements
Total Number
of Atoms
Decomposition Reaction
Water Electrolysis
 Answer questions 1, 2, 3, 4 on pg 33
H
H
O
Pg. 34 Questions 1-4