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 Mixture

Element Compound

Naming Chemicals and Formulas

Hydrogen

HydrogeneWasserstoff Idrogeno

Hidrogenio

Hidrogeno

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

Number and Name of Elements

Total Number of Atoms

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)

Decomposition Reaction

Water Electrolysis

Answer questions 1, 2, 3, 4 on pg 33

HH

O

Pg. 34 Questions 1-4