Chemistry C2 Flashcards
what piece of equipment measures time and what is the unit
stopwatch in seconds
what piece of equipment is used to measure temperature and that is the unit
thermometer in degrees Celsius
what piece of equipment is used to measure mass and what is the unit
mass balance in grams
which 3 pieces of equipment measure volume of a liquid and what is the unit
measuring cylinder, volumetric pipette, burette in cm^3
what piece of equipment is used to measure volume of gas and what is the unit
gas syringe in cm^3
what process is used to separate two or more solids that are soluble
paper chromatography
how do you calculate Rf values in a paper chromatography
distance moved by solute / distance moved by solvent
define a pure substance
a substance that contains a single element or compound not mixed with any other substance
describe 3 ways that the purity of a substance can be assessed
melting point, boiling point, chromatography
describe how melting point and boiling point can be used to assess purity
a pure substance will have a sharp melting/boiling point. impure substances will have a wider range
describe how chromatography can be used to assess purity
a pure substance will have only one defined spot on a chromatogram
describe two examples where purity of substances is important
the manufacturing of compounds used in drugs and food additives
what is a solvent
a substance that dissolves a solute
what is a solute
a substance that is dissolved in a solvent
what is a solution
a liquid mixture composed of two or more substances
