Topic 2 - Bonding Flashcards
What does an ionic bond form between?
metal and non-metal
What does a covaltent bond form between?
non-metal and non-metal
What does a metallic bond form between?
metal and metal
How does an ionic bond form?
The metal loses electrons to become a positively charged ion, the non-metal gains electrons to become a negatively charged ion
How does a covalent bond form?
non-metals share pairs of electrons to gain full outer shells
How does a metallic bond form?
Metals lose their outer shell elctrons into a sea of delocalised electrons
Elements in group 0 will form ions with what charge?
Group 0 don’t form ions because they already have a full outer shell
When are elements stable?
When they have a full outer shell of electrons
In ionic bonding, how are ions held together?
Electrostatic forces of attraction
Explain how Calcium Oxide forms. Remember Calcium is in gorup 2 and Oxygen is in group 6
Calcium loses electrons becoming a positive ion and Oxygen gains electrons becoming a negative ion
Do ionic compounds have high or low melting points?
Ionic compounds have high melting points
Why do ionic compounds have high melting points?
Ions are held together by strong electrostatic forces of attraction
How are ions arranged in an ionic compound?
Giant ionic lattice
Can ionic compounds conduct electricity?
Yes but only when molten or dissolved in water
Why can ionic bonds only conduct electricity when molten or in a solution?
When solid, the ions in an ionic compounds can’t move. When molten or in solution th ions are free to move
Define the term: dissociate
To separate into separate ions. We talk about dissociation in terms of ions in ionic compounds dissociating when in a solution
True or False: All simple covalent molecular substances are insoluble in water
False, Some simple molecular substances are soluble and some are insoluble