Quantitative Chemistry PAPER 1 Flashcards
(18 cards)
What is the law of conservation?
That no atoms are lost or gain in a reaction. The mass of the reactants is equal to the mass of products. Therefore, no mass is lost or gained
What is the formula for percentage yield?
Actual yield / theoretical yield
How do you convert cm into dm?
Cm ÷ 1000
What is the formula for moles?
Mass ÷ Mr
What is the formula for atom economy
Relative formula mass/ all reactants x100
What is the formula for concentration (g/dm)?
Mass ÷ volume
What is the formula for concentration (mol/dm)?
Moles / volume
What is avogadro constant?
The amount of particles one mole contains which is 6.02×10²³
What is actual yield?
The amount of product formed from a reaction
What is a limiting reactant?
The reactant that is used up first. Not in excess
why should a white tile be place under conical flask in titration?
To ensure colour change can be observed
what are two improvements that can be made in titration?
swirl the flask
use a white tile
repeat and calculate mean
why is a burrette used in titration?
As it allows small increments of the solution to be dropped.
can measure in small intervals
what is polystrene?
A insultator/ poor heat conductor
what is a weak acid?
A solution that is partially ionised which produces hydogen ions in an aqueous solution
Titration is the what of an acid and akali?
The neutralisation of an acid and alkali
What is a strong acid?
An acid that is fully ionised in an aqueous solution
What are the steps in titration?
First add indicator to the conical flask
Then add acid to burrette
slowly drop the acid from burrette to the conical flask while swirling it
do this until visible colour change from indicator in solution
should change from pink to colourless
