Chemical Formula D. Crowley, 2007.

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Presentation transcript:

Chemical Formula D. Crowley, 2007

Chemical Formula To understand chemical formula

Definitions Define an element, compound and mixture An element is made up of just one type of atom A compound is two or more elements, chemically bound A mixture is made of different substances, not chemically bound

Elements & Compounds Look at the rocket - it uses liquid hydrogen as a fuel The engine mixes this hydrogen with oxygen, adds a spark and the reaction takes place The elements are They react together, forming a compound called

Elements & Compounds Look at the rocket - it uses liquid hydrogen as a fuel The engine mixes this hydrogen with oxygen, adds a spark and the reaction takes place The elements are hydrogen and oxygen They react together, forming a compound called hydrogen oxide (water)!

Carbon + oxygen  carbon monoxide Chemical Equations Chemical equations show us our reactants and products reactants  products They can be word or symbol equations, e.g. Carbon + oxygen  carbon monoxide C + O  CO

Formula Elements and compounds can be represented using chemical formula We use numbers in the formula, which represents the number of atoms present (as a ratio) C = 1 atom of carbon (C) O2 = 2 atoms of oxygen (O) CO2 = 1 atom of carbon (C); 2 atoms of oxygen (O) NaCl = 1 atom of sodium (Na); 1 atom of chlorine (Cl) H2SO4 = 2 atoms of hydrogen (H); 1 atom of sulphur (S); 4 atoms of oxygen (O)

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Graphical Can you draw the following substances The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

Questions Write down how many atoms there are (and of what element) for the following: - C - e.g. 1 x carbon (C) CO2 H2O CaCO3 H2SO4 NaCl HNO3 CuCO3 MgCl2 Carbon monoxide Hydrogen oxide

Presentation If there is time left, produce a poster in your book which explains formula (as a revision guide) You may wish to add examples, and ways to work out the ratio of atoms…