1 Chapter 3: Elements combine to form compounds Pages 70-92 By Lester Green Smallwood Academy Gambo.

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Presentation transcript:

1 Chapter 3: Elements combine to form compounds Pages By Lester Green Smallwood Academy Gambo

2 3.1 Compounds Pages 72-75

Identify and write chemical formula of common compounds. See international rules outlined in textbook on pages 81-83

Define compound Pure substances that consist of two or more elements combined in fixed proportions. Sodium Chlorine Barium Oxygen Lithium Fluorine Potassium Bromine

continued… Water Two hydrogen atom One oxygen atoms H2OH2O

continued... Hydrogen Peroxide Two oxygen atoms Two hydrogen atoms

continued... Carbon Dioxide One carbon atom Two oxygen atoms CO 2

continued... Carbon Monoxide One carbon atom One oxygen atom

Define compound A pure substance made up of more than one kind of element joined together Represented by a combination of symbols Symbols known as formula Examples: 1. H 2 O 2. MgF 2

Identify whether a compound is ionic or molecular 1.Ionic Atom gains or loses electrons to form ions Atom transfer electron(s)

continued… Atom gaining electron becomes negative Atom losing electron becomes positive Formed between metals and nonmetals. 11

continued… 2. Covalent  formed between nonmetals only.  Occurs when atoms shares electrons to form molecules.  This type of bonding may also be called molecular. 12

Identify whether a simple compound is ionic or molecular (covalent) Ionic compounds formed between metals and nonmetals Covalent (molecular) compounds are formed between nonmetals only

continued… ionic or covalent Ionic Covalent Sodium Chloride Magnesium Sulphide Carbon Tetrafluoride Silicon Disulphide Lithium Nitride Carbon Dioxide

15 Rules for Naming Ionic Compounds (82) 1. Name the metal ion 2. Name the non-metal ion by ending the element name with the suffix “ide”(table 3.1 page 81) 3. Write name of formula Examples: NaCl KBr Sodium Chloride Potassium Bromide

16 Rules for Naming Covalent Compounds (p83) 1. Name the first atom 2. Name the second atom by ending the element name with the suffix “ide” 3. Add prefix to the atom names to indicate the number of each atom in the compound 4. Write the name of the compound

17 Examples of covalent compounds CO Carbon Monoxide CO 2 Carbon Dioxide Silicon Tetrachloride SiCl 4

Compound is represented by element symbols known as a chemical formula Compounds represented by a combination of element symbols Symbols known as a chemical formula Formula indicates the proportion in which elements are present

continued… Examples Worksheet: Complete worksheet on name and ratio of elements in a compound 2 atom of Hydrogen and 1 atoms of oxygen H2OH2O NaCl 1 atom of sodium and 1 atom of chlorine

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