reversible reactions Flashcards
what is the symbol?
2 arrows both facing opposite ways
if there is mass lost in an experiment, what could 2 errors be?
- errors way have been made weighing substances
- student way not have heated the substances for long enough in the experiment
water changes the colour of anhydrous copper sulphate from … to …
from blue to white
what are food additives?
any substances natural or synthetic added to food to extend its shelf life, improve taste or appearance
what can we use to test food additives?
using analytical techniques
advantages an disadvantages of industrial methods
advantages
- accurate
- quick
- sensitive
disadvantages
- expensive
- can go wrong, if so training needed
why is there a lid used in a chromatography experiment?
it keeps the solvent from evaporating
why is there a pencil line in a chromatography experiment?
so that the results don’t blend into the line
what happens in a chromatography experiment?
can separate different colours in food ➡️ some colours dissolve well and rise up the paper ➡️ some colours don’t dissolve well
