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Chemistry (In the mock) (Core (Atomic Structure (Proton (Protons have a…
Chemistry (In the mock)
Core
Atomic Structure
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Electron
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Orbit the Nucleus in shells, because of their positive charge
There is always the same number of electrons as protons in an atom. If there is an imbalance this is called an ion.
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Elements in the periodic table are in order of their atomic number, which is the number of protons they have
On the top part of the symbol there is a number, which is the atomic weight. The atomic weight is the numbers of protons + the number of neutrons
Hydrocarbons
Cracking Hydrocarbons
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Cracking hydrocarbons creates saturated hydrocarbons which are used as fuel (alkanes) and unsaturated hydrocarbons which are used in the process of making plastic (alkenes)
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Additional
Equilibrium
In a chemical equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on at the same rate as each other.
Other factors:
If we remove the products from an equilibrium mixture, more reactants are converted into products. If a catalyst is used, the reaction reaches equilibrium much sooner, because the catalyst speeds up the forward and reverse reactions by the same amount. The concentration of reactants and products is nevertheless the same at equilibrium as it would be without the catalyst.
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