Practicals -Chemistry Flashcards
(16 cards)
What practical is it when water is being filtered
filtration
what is the distillation practical
a separation technique used to separate liquids from mixtures based on their boiling points,
what is distillayion practical used for
purify water or separate components of a solution.
whats an example of ditillation
extracting pure water from saltwater
what is the Rf value
to measure how far a substance moves on a stationary phase compared to the solvent front.
what does Rf value stand for
retention factor
how to calculate Rf value
distnace travvled by the substance/ distance travelled by the solvent front
what happnes when lithium reacts with water
it floats, fizzes, moves about, no flame
what happnes when sodium reacts with water
reacts faster, floats, moves around, fizzes, yellow/orange flame or no flame
what hapens when potassium reacts with water
bursts in to flames, purple flame, pops and fizzes, moves around
why does pottassiums flame turn purple
because it is an alkali metal
why should you draw the starting line in pencil on the chromotograhy paper
because the ink might react with the water
how to calculate the gradient
vlume of gas/ time
why would a curve on a graph stop increasing at a certain point
because the element is all used up
how would you know if an acid is the most concentrated on a graph
it would increase first and rise more steep
