Elements and Compounds Lesson 2

Elements v. Compounds Element – OxygenCompound – 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 ElementCompound

Naming Chemicals and Formulas Hydrogen Hydrogene Wasserstoff 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)H2O(l) Two Hydrogen One Oxygen Liquid

Compound Name Common UseChemical Formula Number and Name of Elements Total Number of Atoms Calcium carbonate Chalkboard chalk CaCO 3(s) Sodium phosphate Heavy-duty cleaner Na 3 PO 4(s) Magnesium chloride De-icing roadsMgCl 2(s) Monosodium glutamate (MSG) Food seasoningNaC 5 H 8 NO 4(s) Hydrogen peroxide Bleach and disinfectant H 2 O 2(l) GlucoseSugarC 6 H 12 O 6(s) Carbon dioxideFizz in pop, dry ice CO 2(g) Freon-12Refrigerator coolant CCl 2 F 2(g)

Decomposition Reaction

Water Electrolysis  Answer questions 1, 2, 3, 4 on pg 33 HH O

Pg. 34 Questions 1-4