Grade 11 chemistry - Quantities in Chemical Formulas
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10 Terms
Qualitative Analysis
the process of identifying substances present in a sample; no measurements are involved
Quantitative analysis
The process of measuring the quantity of a substance in a sample, providing numerical data
mole
a unit of amount; the amount of substance containing 6.02 × 1023
Avogardo’s constant (NA )
The number of entities in 1 mol of a substance
amount (n)
the quantity of a substance, measured in moles
Molar mass
the mass of 1 mol of a substance; unit symbol g/mol
percentage composition
the percentage, by mass, of each element in a compound
law of definite proportions
the statement that a compound always contains the same proportion of elements by mass
Empiricial formula
a formula that shows the simplest whole-number ration of elements in a compound
Molecular formula
a formula that shows the element symbols and exact number of each type of atom in a molecular compound