Quantitative Chemistry- Chemistry Paper 1 Flashcards
What does Ar mean?
Relative atomic mass
What does Mr mean?
Relative formula mass
What would you expect to happen during the reaction of zinc and hydrochloric acid?
The mass of the flask and the reactants will decrease as some hydrogen is lost to the atmosphere
Give an example of when the mass changes during a reaction?
Corrosion of metals/zinc+hydrochloric acid/combustion of wood
Every chemical measurement involves some….
uncertainty
To reduce uncertainty, what can we do?
We can take multiple readings and obtain an average from them
What does the molecular formula show?
The actual amount of atoms that make up a molecule
What does the empirical formula show?
The simplest ratio of atoms which makes up a molecu;e
1 mole of a substance is…… atoms of that substance
6.02x10^23, otherwise known as Avogadro’s constant
What is the relative formula mass of a substance equal to?
The mass of one mole of that substance in grams
What is the equation for moles?
Moles = Mass/Formula Mass
What is a limiting reactant?
A reactant thats completely used up during a reaction and the reaction stops once its used up
What is concentration equal to?
mass/volume or moles/volume
What can the units of concentration be?
g/dm^3 OR mol/dm^3
