8G All That Glitters Flashcards
Most gemstones are
Minerals
What does the chemical form of a substance show
The ratio of atoms of each element that are bonded together.
How do you get iron out of a mixture of sulphur and iron
A magnet
When is energy usually released
When the atoms bond together and this energy is given to the surroundings
What is fools gold
Fake gold which is iron sulphide
Iron sulphide word formula
Iron + sulphur
What are physical changes
Change of state
Decomposition def
The breaking or splitting apart of a substance
What is a precipitation reaction
No heat is needed for the reaction
Are mixtures more common than pure substances
Yes
Electrolysis only works if
Compounds are molten or in a solution
A metal will formst which electrode
The negative electrode and the non metal at the positive elctrode
What is electroplating
When you use electrolysis to put a thin plating of a metal on top of an other metal
The melting point is the same as the
Freezing point
The temperature at which evaporation happens
Is the boiling point
