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So, the empirical formula means the smallest value, like the lowest common denominator in maths, but instead of fractions we are going to be using chemical formulae. I always find it easiest to set it out...

Elements in the periodic table are arranged by increasing atomic number (number of protons). Atomic number of elements steadily increases across a period (horizontal rows of the periodic table). Elements ...

Particles in a solid state are packed very close together whereas in a gaseous state they are very far apart.Particles in a solid state have a regular, structured pattern whereas gaseous particles are ran...

If you increase the pressure the equilibrium tries to reduce it and moves to the direction of fewer gas molecules.
If you decrease the pressure, the equilibrium moves to increase it and moves where ...

In the solid phase the ionic lattice has no mobile ions as all the ions are fixed in place. However when dissolved in a solution or in the molten phase, the ionic lattice breaks down allowing the ions to ...