Science: Chemistry Flashcards
What does relative atomic mass mean?
The average mass of an element
How do you work out relative atomic mass?
Find the bigger number of the periodic table
What does relative formula mass mean?
The sum of the relative atomic masses of the atoms in the numbers shown in the formula
How do you work out relative formula mass?
Add up the mass of all the elements in a compound
The equation for calculating percentage mass
% = 100 x relative mass of all atoms in an element ÷ Mr
What does the law of conservation of mass say?
No atoms are lost or made during a chemical reaction, the mass of the products equals the mass of the reactants
Equation triangle for moles
Mass = Mr x moles Mr = Mass ÷ moles moles = Mass ÷ Mr
How can you identify the limiting reactant in a reaction?
The limiting reactant is the reactant that is completely used up
What does concentration mean?
The mass of a substance in a given volume
Equation triangle for concentration
Mass = concentration x volume Concentration = mass ÷ volume volume = mass ÷ concentration
