C3.1 Flashcards
What is the law of conservation of mass?
Atoms cannot be created or destroyed by chemical reactions
The same atoms are present at the start and end of a reaction just joined in different ways
Therefore the total mass stays the same
How can you investigate the law of conservation of mass?
Carrying out a reaction in a closed system
What is a half equation?
Models the change that occurs for one reactant in a reaction
What is an ionic equation?
Shows the ions present in a reaction mixture
What is the mole?
The unit for the quantity of a substance
What is Avagadro’s constant?
6.02 x 10^23
Number of entities in 1 mole
What is an equation for moles with mass?
Moles = mass/mr
What is a limiting reactant?
The reactant that is limiting in amount
Determines the amount of product formed
What is stoichiometry?
Describes the relative amounts of each substance
Balanced numbers
The big numbers
