Periodic Table
What are ions?
When an atom gains or loses an electron, it produces a charged particle called an ion
True or false? Quenching creates smaller crystals but a more brittle metal
True
Name 2 properties of ionic compound:
-Able to conduct electricity
in liquid and aqueous forms,
but not solid form
-Vary from being very soluble to insoluble in water
-Hard but brittle
-High melting and boiling points
How many molecules in one mole of lithium?
How many double covalent bonds exist within Carbonate ?
1
What is the simple shell configuration of chlorine?
2, 8, 7
What is the name of the ionic compound SnCl4?
tin (IV) chloride
What is the molar mass of H3PO4?
98g per mole
How many electrons do carbon atoms share with one another in Diamonds ?
4
What are isotopes?
Isotopes of atoms have the same number of protons but different number of neutrons.
Explain why metals conduct electricity
free moving/ delocalised electrons
What is the name given to the compound H2PO4- ?
dihydrogen phosphate
how many moles in 22g of argon?
0.55 Moles
Why do covalent bonds exist?
In order to lower the potential energy of the individual atoms, and stabilise them and make them less reactive
What does the Schrodinger's Model State?
Within an atom there are major energy levels which we call shells. Numbered 1,2,3, and so on
Within shells are levels of similar energy called subshells which are labelled by letters s, p, d and f
Subshells are made up of orbitals: the region in which the electrons move. One orbital contains two electrons: think of them as pairs
List three properties of metals
lustrous, malleable, ductile, conducts electricity, relatively high boiling and melting temperatures, relatively high densities
Describe what a brittle means:
If sufficient force is applied, liked charged ions that come into contact with each other, may repel one another, and cleave and shatter the ionic compound
what is the percentage composition of Magnesium in magnesium carbonate?
28.38 %
Describe the shape of Borane (BH3) ?
Trigonal planar