Quantitative Chemistry Flashcards
What is the Conservation of Mass?
Atoms cannot be created or destroyed
When a Metal forms a Metal Oxide, why does the Mass increase?
Oxygen Atoms have been added
When an Acid reacts with a Metal, why does the Mass decrease?
A Gas is produced and it escapes
What is the Relative Formula Mass?
The Sum of the Relative Masses of each Atom in a Compound
What are the 4 State Symbols?
Solid (s)
Liquid (l)
Gas (g)
Aqueous (aq)
What is the Symbol for Relative Formula Mass?
Mr
What is a Mole?
A Number of Particles
What is Avogadro’s Number?
6.022* 10^23
Which Formula relates Moles, Mass and Mr?
Moles= mass/Mr
What is a Limiting Reactant?
A Reactant that does not have enough Mass to react with all the other Reactants
What is the Unit for Concentration?
g/dm^3
Which Formula relates Concentration, Mass and Volume?
Concentration= mass/Volume
If the quantity of a Solute in a Solution is Increased, what happens to the Concentration?
It Increases
If the Volume of Water in a Solution is Increased, what happens to the Concentration?
It Decreases
What is the Yield of a Chemical Reaction?
How much Useful Product there is
What is the Theoretical Yield of a Chemical Reaction?
The Yield which you would expect to get in a Reaction
What is the % Yield of a Chemical Reaction?
How much actual product there is divided by the Theoretical Yield
Why is the % Yield almost never 100%?
Reversible Reaction
Loss of Product on Separation
Unexpected Side Reactions
What is Atom Economy?
How much starting Material ends up as Useful Product
Why is Atom Economy important?
Economic and Sustainability reasons
How is Atom Economy Calculated?
100*Mr Desired Product
What are the 2 Units for Concentration?
g/dm^3
mol/dm^3
What is the purpose of Titration?
To establish the Concentration of an unknown Solution
What do Moles of Gases and their Volumes have in common?
At the same Temperature they occupy the same Volume
What is the Volume of one Mole of any Gas at Room Temperature and Pressure?
24dm^3
