Flashcards
structure and bonding
Flashcards do conjunto (20)
- 1definition of a metallic bond?the force of attraction between the positive metal ions and the delocalised outer electrons
- 2definition of a ionic bond?the force of attraction between 2 oppositely charged ions
- 3definition of a covalent bond?the force of attraction between a shared pair of electrons and 2 positive nuclei
- 4why do simple molecular substances have (molecules) have low melting and boiling points? and what does this explain?they have weak intermolecular forces between their molecules, this explains why many elements are gases at room temp
- 5giant structures.....DO NOT HAVE WEAK INTERMOLECULAR FORCES!
- 6why do metals conduct?because they have delocalised electrons
- 7why does ionic compounds and ionic solutions conduct?because they have free moving ions that carry charge when voltage is applied.
- 8why dont ionic solids conduct?because the ions are held in place by strong forces of attraction.
- 9what are metals malleable and ductile?they are made up of layers of positive ions that can slide over each other when a force is applied.
- 10giant ionic typical properties?particles present- + ions -ions
type of bonding- strong ionic bonds
melting point- high
conduct electricity- not as a solid but molten or in a solution. - 11giant covalent typical properties?particles present- atoms
type of bonding- strong ionic bonds
melting point- high
electricity conductivity- not at all (except graphite) - 12simple molecular typical properties?particles present- molecules
type of bonding- weak intermolecular forces
melting point- low
conduct electricity- no - 13giant metallic typical properties?particles present- +ions, delocalised electrons
type of bonding- strong metallic bonds
melting point- high
electricity conductivity- solid yes, molten or in solution yes - 14definition of an atom?a particle with an equal amount of protons and electrons
- 15definition of a molecule?small group of atoms bonded together
- 16definition of an ion?an atom that has lost or gained electrons- it is a charged particle
- 17definition of an element?a pure substance made up of one type of atom
- 18definition of a compound?a substance made up of two or more elements chemically bonded together
- 19definition od a cation and an anion?cation- positively charged ion, lost an electron
anion- negatively charged ion, gained an electron - 20delocalised electrons?electrons that are not fixed in position; they are free to move aroubd
Informações
- Descrição
- definitions of atom molecule ect. properties of structures
- Criado por
- walleri
- Visualizações
- 45
- Avaliação