Practical Questions ALL Flashcards
How do anti-bumping granules work
Makes bubbles smaller
Describe reflux diagram
Open top, condenser around pipe directly above the mixture, no gaps between open top and flask, heat source below
Colour of phenolphthalein in acid
Colourless
Colour of phenolphthalein in alkali
Purple
How to remove soluble impurities from a mixture
Add water
Why do we make a standard solution for a titration
Have enough of the solution to do multiple titres
Main sources of error in enthalpy changes
Heat loss to surroundings, incomplete combustion, water may evaporate, energy used to heat up copper can
How to measure the rate of reaction with temperature
See the formation of precipitate over time
What is the rate of reaction proportional to
1/x
Why does water enter from the bottom of a condenser
Water must enter from the bottom of the condenser in order to fill the entire condenser. If water enters from the top it drains from the bottom and never fills it up
Define hydrolysis
Splitting a molecule with water
How to measure how much gas is produced
Gas syringe
Describe the diagram for filtration
Funnel over a beaker, no gaps, filter paper on the funnel (v-shape)
Improvements to making a standard solution
Measure the solid by difference, wash any apparatus after transfer into the next container, read from the bottom of the meniscus, stir till all the solid dissolves
Why use anti-bumping granules
To prevent vigorous boiling
