quiz 11 Flashcards
Explain why alloys can be harder than pure metals
They have different atoms sizes
which disrupt the layers
so they cant slide over each other
Explain why pure metals have higher melting and boiling points.
strong metallic bonds between metal ions and delocalised electrons
require a lot of energy to overcome
Give 4 typical properties of pure metals
high melting and boiling points
malleable
good conductors of electricity
good conductors of thermal energy
State the effect of the concentration of a solution if the volume of water in its increased
it decreases
Describe the structure of metals
giant structure
metal ions in layers
delocalised electrons
In chemical reactions, explain why mass can sometimes appear to decrease
because one of the products is a gas and escapes
In chemical reactions, explain why mass can sometimes appear to increase
Because of the one of the reactants is a gas which is added to the products
State the equation that links moles,mass and Mr
moles= mass/Mr
Explain why metals are good conductors of thermal energy
Delocalised electrons can move through the metal and transfer energy
Explain why pure metals are malleable
layers of metal ions are free to slide over each other
State the unit of measurement used for chemical amounts
Moles
Give a reason for alloying a metal
To make it harder
Give the four state symbols
(s) solid
(l) liquid
(g) gas
(aq) aqueous
State the effect on the concentration of a solution if the amount of solute in it is increased
it increases
State the law of conservation of mass
mass cant be created or destroyed
