C4- Chemical Calculations Flashcards
Avogadro constant
The number of atoms, molecules, or ions in a mole of any substance (i.e., 6.02 x 10^-23)
Concentration
The amount of asuvstance dissolved in a give volume of liquid
Limiting reactant
The reactant in a chemical reaction that when used up causes the reaction to stop
Mole
The amount if a substance dissolved in a given volume of liquid
Relative atomic mass Ar
the average mass of the atoms of an element compared with carbon-12 (which is given a mass of exactly 12). The average mass must take into account the proportions of the naturally occurring isotopes of the element
ReLative formula mass Mr
the total of the relative atomic masses, added up in the ratio shown in the chemical formula, of a substance
Whats an acid
A solution that forms aquous solutions with a pH of less than 7
Whats a base
A substance with a pH greater than 7
Whats an alkali
A base that dissolves in water to form a solution with a pH greater than 7
What is the reaction between acids and bases called
Neutralisation
What does strong acids do
Strong acids ionise completely in water
What do weak acids do
Weak acids do not fully ionise in solution
What is the pH of an acid or alkali
Is a measure of the concentration of H+ions in the solution
What acroynm is tro remember reactivity series
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