15128637
Description
Flashcards by Oluoma Onugha , updated more than 1 year ago
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Created by Oluoma Onugha
about 6 years ago
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| Question | Answer |
| What is Covalent bonding? | Covalent bonding is the sharing of electrons between 2 non-metals |
| List the properties of small covalent molecules? | - low melting + boiling points - usually liquids/ gas at room temp - weak forces of attraction - do not conduct electricity because molecules have no overall electrical charge |
| What is Ionic bonding? | Ionic bonding is when atoms lose/ gain electron to have a full outershell. Metal atoms lose electron to become positively charged ions. Non-metal atoms gain electons to become negatively charged ions |
| What is Metallic bonding? | The strong electrostatic forces of attraction between metal ions and a sea of delocalised electrons. |
| list the properties of large covalent molecules? | - always solid at room temperature - high melting + boiling points |
| What are the properties of a solid. | - have a fixed shape (cannot be compressed) - strong forces of attraction between particles - particles very close together - vibrate around a fixed point (small amount of kinetic energy) |
| describe the structure and properties of a diamond | - giant rigid covalent structure (lattice) - each carbon atom covalently bonded to 4 other carbon atoms - very high melting and boiling point - cannot conduct electricity as no free electrons to carry charge |
| What are the properties of a liquid. | - hard to compress - take the shape of their container - particles are close together but not as close as solids so forces of attraction are not as strong - have a random shape - vibrate but have more kinetic energy than solids |
| What are the properties of gases? | - easy to compress - take the shape of their container - have a random arrangement - particles very far apart (no forces of attraction) - move quickly in all directions |
| What is this an example of? How do you know? | ionic bond as it involves gaining/losing electrons from the elements |
| name the 2 allotropes of carbon | diamond + graphite |
| give the structure and properties of silicon dioxide (silica) | - oxygen and silicon covalent bond together - each oxygen is joined to 2 silicon atoms - each silicon is joined to four oxygen atoms - high melting and boiling point |
| what is this an example of? How do you know? | covalent bond as it involves sharing of electrons |
| give the structure and properties of graphite. | - a form of carbon - high melting and boiling point - 1 carbon atoms covalently bonded to 3 carbon atoms layered hexagonal structure - no covalent bonds between layers + held together by weak intermolecular forces so are slide past each other - slippery and soft so good as lubricant - can conduct electricity |
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