wrong answers Flashcards
what colour does methyl orange turn when nutralised
orange
what colour does methyl orange turn when =, alkaline, neutral, and when acidic
yellow
orange
red
what is the equation for ammonium sulphate
(NH4)2SO4
why is graphene a good conductor
.carbon has 4 outer shell electrons
- 3 electrons used in bond each carbon forms 3 bonds
- one electron per carbon is free to move
what is the chemical equation for Sodium Hydroxide
2NAOH
what is the process in which an alcohol can be converted into an carboxylic acid
oxidation
what are the two steps to be taken to turn carbohydrate into ethanol solution
add yeast
warm
how to improve an experiment to give a temperature rise closer to the theoretical value
use a lid or a draught shield
so less energy escapes
why is the fermentation carried out at 30c and not 80c
yeast provides enzymes
at 80c the enzymes will denature
what is the equation for the production of ethanol through fermentation
glucose=ethanol + carbon dioxide
why is ceramic a more suitable material for washbasins than metal
no reaction with water, will not corrode
what will be SEEN when chlorine water is added to potassium bromide solution and shaken
-potassium bromide is colourless
-mixture will turn orange as bromine water is formed
what cation produces a red-orange flame
calcium
why is instrumental analysis better
more accuracy
how do u test for a carboxylic acid in solution (2 ways)
damp blue litmus paper will turn red due to acidic PH
sodium carbonate will effervesce as reaction takes place (sodium carbonate + butanoic acid= sodium butanoate + carbon dioxide + water )
