Compounds and ionic and covalent bonding
- Created by: cassiarh01
- Created on: 15-03-18 17:12
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- Compounds
- Atoms join together to make compounds
- When 2 or more elements react
- The atoms of each element are in fixed proportions in the compound
- Atoms are held together by chemical bonds
- Only way to separate a compound into its elements is by using a chemical reaction
- Different types of a compound
- Covalent - non-metal bonding. They share pairs of electrons in their outer shells
- Have electrostatic forces - v strong
- Stable atoms because they make enough covalent bonds to fill up their outer shells
- Ionic - metals and non-metals bonding. They lost electrons to form + charged ions
- Non-metal atoms gain these electrons to form negatively charged ions
- Strongly attracted to each other by electrostatic forces
- The ionic bonds hold it together to make an ionic compound
- Have a giant lattice structure, strong electrostatic forces
- High metling & boiling points - lots of energy is needed to break all the strong ionic bonds, when solid can't conduct electricity, when melted can conduct, dissolve in water and conduct electricity
- Dot and Cross diagrams - show how ionic compounds are formed
- Electron - represented by a dot/cross
- Don't show the structure of the compound, the size of the ions or how they're arranged
- Covalent - non-metal bonding. They share pairs of electrons in their outer shells
- Atoms join together to make compounds
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