OCR UNIT 1: ELECTRONS, BONDING AND STRUCTURE all included
- Created by: carys ☺
- Created on: 14-05-13 15:16
Other questions in this quiz
2. What are three characteristics that ionic compounds have (when in a giant ionic structure)?
- always conducts electricity, low boiling point, cannot dissolve in water
- conduct electricity when molten or dissolved, have high boiling points, dissolve in water
- dissolve in water, low boiling point, can not conduct electricity
- high boiling point, always conducts electricity and cannot dissolve in water
3. How do the delocalised electrons in metallic bonding effect the melting point?
- They make the melting point lower because it stops the positive ions being attracted togther
- They make the bonding between atoms weaker
- The more electrons there are, the stronger the bonding will be and the higher the meling point because the positive metal ions will have more electrons to be attracted to
- Because the shared pair of electrons create a strong intermolecular force
4. What is dative covalent bonding?
- When there are less than 8 electrons in outer shell
- When both electrons come from one atom
- When there are more than 8 electrons in outer shell
- When atoms share more than one pair of electron e.g. in N2
5. What is the definition of the first ionisation energy?
- a high attraction between the electron and the nucleus
- the ability to remove all the electrons from the outer shell in an exothermic process
- the energy needed to remove 1 electron from each atom in 1 mole of gaseous atoms to form one mole of gaseous 1+ ions.
- the energy needed to remove 1 electron from each ion in 1 mole of gaseous 1+ ions to form one mole of gaseous 2+ ions.
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