OCR B Chemistry Practical Questions

When making an ester, conc sulphuric acid acts as a [blank_start]catalyst[blank_end].

When reacting iodine with starch solution, the solution will go from [blank_start]blue-black[blank_end] to [blank_start]colourless[blank_end].

When selecting which filter is complementary during colorimetry, you should use the filter that gives the [blank_start]maximum[blank_end] absorbance reading.

Heating under reflux means [blank_start]boiling[blank_end] the mixture and allowing it to [blank_start]condense[blank_end] and fall back into the flask.

Carbonates with a [blank_start]greater[blank_end] charge density will be less thermally stable becasue they will distort the large carbonate ion [blank_start]more[blank_end].

Weighing ou a larger sample will be more accurate than a smaller one becuase there is a smaller [blank_start]weighing error[blank_end].