introduction 3.1 Flashcards
what is a physical change
create no new substances
easy to reverse
absorb or release small amounts of energy
what is a chemical change
creates new substances
difficult to reverse
absorb or release large amounts of energy
chemical test for water
anhydrous copper(II) sulphate turns from white to blue
test for pure water
Mp = 0
Bp = 100
metal properties
high MP/BP
electrical conductors
malleable
shiny
non-metal properties
low MP/BP
electrical insulators
brittle
dull
7 diatomic molecules
hydrogen
nitrogen
fluorine
oxygen
iodine
chlorine
bromine
what is a compound
a substance containing more than one type of atom chemically bonded together
how are compounds formed
heating elements together
3 types of compounds
metallic, ionic, covalent
solute
substance which is going to be dissolved
solvent
liquid which is going to do the dissolving
solution
resulting mixture of solute dissolved in solvent
saturated
a solution in which no more solute can be dissolved in
suspension
a solid floating in a liquid because it cannot dissolve
how is solubility measured
g per 100g of solvent
what does the line of a solubility curve show
saturation, the max mass of a solid which can be dissolved at each temp
what does the area below the solubility curve show
soluble, it will dissolve
what does the area above the solubility curve show
insoluble, some will dissolve and some wont
