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Descrição
FlashCards por Robert Hebbs, atualizado more than 1 year ago
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Criado por Robert Hebbs
quase 10 anos atrás
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| Questão | Responda |
| Why do atoms bond? | To get a stable full outershell of electrons |
| What type of bonding to you get with a metal an a non-metal | Ionic Bonding |
| What type of bonding do you get with two non-metals? | Covalent bonding |
| What happens to a metal in ionic bonding? | It loses its outer shell electrons to form a positive ion |
| What happens to a non metal in ionic bonding? | It gains electrons to get a full outer shell of electrons forming a negative ion |
| What is an ion? | A charged particle (metals form positive ions, non-metals negative ions) |
| What properties does an ionic compound have? | High melting point Only conduct electricity when molten or dissolved in water |
| Why do ionic compound have high melting points? | They have a giant ionic lattice containing lots of strong ionic bonds which need to be broken with large amounts of energy |
| Why do liquid and aqueous ionic compounds conduct electricity? (aqueous means they are dissolved in water) | Because their ions are free to move and carry charge. |
| What happens to the electrons of atoms in covalent bonding? | The two atoms share electrons to get a full outershell |
| What 2 types of covalent compounds are there? | Simple molecular & Giant covalent |
| What are the properties of a simple molecular covalent compound | Low melting point Does not conduct electricity |
| What are the properties of a giant covalent compound? | Very high melting points Do not conduct electricity except graphite & fullerenes |
| What are the properties of diamond? | High melting point & hard (Giant covalent structure, lots of strong bonds) |
| What are the properties of graphite? | High melting point (strong bonds) Conduct electricity (delocalised electrons) Slippy (layers can slide) |
| What type of bonding occurs in metals? | Metallic bonding |
| Why do metals conduct electricity? | Their outer shell electrons are delocalised and free to move carrying the charge |
| What's the difference between a pure metal and an alloy | An alloy is a mixture of metals and is harder |
| What is a nano particle? | A really really small particle |
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