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No atoms are lost or made during a chemical reaction, so the total mass of the products is equal to the total mass of the reactants.
Student drawings will indicate a central nucleus with 6 neutrons and 6 protons, as well as 6 surrounding electrons in one shell.
The three subatomic particles are electrons, protons and neutrons. Protons are positively charged and have a relative mass of 1 whilst neutrons are neutral in charge and also have a positive charge of 1. ...
Protons have a +1 charge and electrons have a -1 charge. The overall charge on an atom is 0, therefore there must be an equal number of protons and electrons in an atom so that the charges cancel out. So ...
(Using a diagram of energy changes) The simplest way of thinking about it is that exothermic reactions release energy, such as heat, to the surroundings whereas endothermic reactions absorb energy from th...
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