Module 1 Ionic compounds Flashcards
what elements are required for ionic compounds to form?
A Metal and non-metal element
How can you predict the ionic charge from position in the periodic table?
The group number tells you the charge an element would have when it gave away its outer shell of elections. For E.G. Magnesium (group 2) would have a charge 2+
What are positive ion’s sometimes called (Mostly in electrolysis)
Cations
What are negative ion’s sometimes called (Mostly in electrolysis)
Anions
Why do ionic bonds stay together?
The reacted ions are held together by a strong electrostatic attraction caused from the gain of opposite charges when their electrons are given away.
What are some properties of ionic compounds?
High melting points.
Non-conductive as a solid
Brittle
Why are ionic substances brittle?
As the layers begin to move over each other, the negative ions begin to come into contact and repel each other causing the structure to fall apart.
Why do ionic substance’s conduct electricity as an aqueous solution or when molten but not when solid?
When not in a solid state, the compound can undergo electrolysis in which the +ve and -ve ions are now free to move to the Cathode and Anode
what happens when the ions reach the electrode? (cathode/Anode)
At the Cathode the negative Ions gain the electrons they’re missing and become a neutral atom (In terms of charge. At the Anode, the positive ions gain electrons and become neutral (In terms of charge).
Which ionic compounds are soluble?
Common salts of Sodium, Potassium and ammonium.
All Nitrates
Chlorides (Except Silver and lead chloride)
Sulfates (Except Lead, barium and calcium sulfates
Carbonates and hydroxides are insoluble (Except Sodium, Potassium and Ammonium)
What is the definition of an ionic bonding
Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions.
