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Unit 1: Formulae, Equations and Amount of Substance
Transcript of Unit 1: Formulae, Equations and Amount of Substance
1.3a Demonstrate an understanding of the terms atom, element, ion, molecule,
compound, empirical and molecular formulae
1.3b Write balanced equations (full and ionic) for simple reactions, including the
use of state symbols
Note the mass of each element
Divide by the atomic number
Divide by the lowest figure
Obtain the lowest whole number ratio to get the empirical formula
Find the empirical formula mass
Divide the relative molecular mass by the empirical formula mass
Multiply the number of atoms in the empirical formula by the number in step 2
Full and Ionic Equations
Only some of the ions in an equation take part in the equation. The ions that play no part in the reaction are called spectator ions. Spectator ions are the ions that change state.
In your own words, define the following terms
Definitions you need to know!
The smallest unit of mass that defines the chemical elements
A pure chemical substance consisting of a single type of atom distinguished by its atomic number
A charged atom or molecule
Two or more elements chemically bonded together
A substance made of two or more different elements chemically bonded together
The formulae that tells us the simplest ratio of the different atoms present in a molecule
The formulae that tells us the actual numbers of each type of atom in a molecule
Chemical formulae and state symbols
It is sometimes useful to specify the physical states of the reactants and products in a chemical reaction.
s = solid
l = liquid
g = gas
aq = aqueous ( a solution in water)
State symbols are written after the formula of each reactant and product