Quantitative Chemistry
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1
What is atomic no. ?
the number of protons and electrons
2
What is atomic mass?
the number of protons and neutrons
3
What is relative formula mass?
the sum of the relative atomic masses of all atoms in a formula
4
How do you find percentage by mass?
individual mass / total mass x 100
5
What is the law of conservation of mass?
Atoms can’t be created or destroyed; the mass of the reactants must equal the mass of the products
6
What does accuracy mean?
how close you get to an answer
7
What does precision mean?
how close a set of results or measurements are
8
What is resolution?
the smallest measurable part of a unit
9
What is 1 mole (Avogrado’s Constant)?
6.022 x 10*23 particles
10
What will 1 mole of a certain atom weigh?
The element’s relative atomic mass
11
How many grams of oxygen would equal 1 mole?
16g
12
How do you work out the moles from an amount of a certain element?
mass / relative formula mass
13
What are excess reactants?
where there’s more reactant than necessary
14
What are limiting reactants?
where the amount of reactant affects how much product is made; will be used up first and stops the reaction
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