mole Flashcards
define relative atomic mass
the relative atomic mass of an element is the mass of one atom relative to 1/12 the mass of one atom of 12C.
how many particles are there in one mole?
6.23x10^23 particles
what is one mole
it is the amount of substance that contains 6.23x10^23 particles
define empirical formula
empirical formula of a compound is the formula that shows the simplest whole number ratio of the atoms of the different elements in the compound
define molecular formula
it shows the actual number of atoms of each element present in one molecule of a compound
how to draw the table that determines empirical formula
element, then % by mass, then Ar, then amount then simplest ratio
general equation of combustion of hydrocarbon?
CxHy + (x + y/4) O2 -> xCO2 + y/2 H2O
how to calculate the concentration of dilute solution
c1V1 = c2V2
pH range of methyl orange?
3.1 - 4.4
colour changes of methyl orange?
acidic: red
alkaline: yellow
end point: orange
pH range of thymol blue
8.0 - 9.6
colour changes of thymol blue
acidic: yellow
alkaline: blue
end point: green
pH range of thymolphthalein?
9.3 - 10.5
colour changes of thymolphthalein?
acidic: colourless
alkaline: blue
end point: light blue
pH range of phenolphthalein?
8.3 - 10.0
