Experiments for unit 1 Flashcards
how can reactions be followed?
MEASURING CHANGES IN CONCENTRATION, MASS OR VOLUME OF REACTANTS & PRODUCTS
reactions that release what are the easiest to follow?
reactions that release a GAS
pg7
what is the cotton wool experiment used to calculate
the decrease in MASS as the gas escapes (to follow reaction)
what is electrolysis used for
splits compound into constituent elements
what is electrolysis
the passing of a current through an electrolyte(solution/melt that can conduct electricity)
During electrolysis what forms at the positive electrode?
gas
During electrolysis what forms at the negative electrode
metal/solid
what can be concluded from a electrolysis experiment
during electrolysis POSITIVE METAL IONS are attracted to the NEGATIVE ELECTRODE where they GAIN ELECTRONS
NEGATIVE NON-METALS IONS are attracted to the POSITIVE ELECTRODE where they LOSE ELECTRONS.
how is a solution formed
when a SOLUTE(solid) dissolves in a SOLVENT
what’s a Standard Solution?
solution who’s Concentration is known accurately
what’s titration
technique that allows exact v of acid needed to neutralise alkali to be calculated
to make a soluble salt
what’s neutralisation
reaction of acid w a base, that produces…
what’s filtration
ex]2 base is insoluble
remove excess base through filtration
filtrate evaporated(Bunsen burner) to collect salt
how do u make a salt through titration
ex}2 soluble base
second time without indicator
product is dissolved in water so needs Evaporation (Bunsen burner)
what’s a precipitation reaction
making insoluble salts
when 2 solutions react to form a solid (precipitation)
solid can be collected by filtration
