- Slides: 21
Elements and Compounds Lesson 2
Elements v. Compounds Element – Oxygen Compound – Carbon Dioxide
The Letters of Life v Just like words are made up of letters, compounds are made up of elements
Questions v What is an element? v What is a compound?
Pure Substance? ? Matter Pure Substance Element Compound Mixture
Naming Chemicals and Formulas n e og r d y H Wa ss e n e ers Hy tof o n e g o idr H g o dr Id f io n e H g o r id ro ge no Why would it be confusing if everyone used different names for chemicals?
IUPAC v International Union of Pure and Applied Chemistry v The symbols for the elements were the First Letter of the elements name. v When they used that letter the next element stating with the same name used a lower case letter.
Questions v Why is the Symbol “C” used for Carbon and not for Calcium? v Why is the symbol for lead “Pd” and not “Le”?
Writing/Reading Chemical Formulas H 2 O(l) Two Hydrogen One Oxygen Liquid
Compound Name Common Use Chemical Formula Calcium carbonate Chalkboard chalk Ca. CO 3(s) Sodium phosphate Heavy-duty cleaner Na 3 PO 4(s) Magnesium chloride De-icing roads Mg. Cl 2(s) Monosodium glutamate (MSG) Food seasoning Na. C 5 H 8 NO 4(s) Hydrogen peroxide Bleach and disinfectant H 2 O 2(l) Glucose Sugar C 6 H 12 O 6(s) Carbon dioxide Fizz in pop, dry CO 2(g) ice Freon-12 Refrigerator coolant CCl 2 F 2(g) Number and Name of Elements Total Number of Atoms
Water Electrolysis v Answer questions 1, 2, 3, 4 on pg 33 H H O
Pg. 34 Questions 1 -4