For a reaction to occur, the reactants must have enough energy to overcome a barrier so as to reach the transition state and consequently form products (Fig. 1). The reactants all possess ...

The big number written in front of a molecule (coefficient) shows how many of that molecule there are. All the atoms in the products come from the atoms in the reactants. The reactants are on the left ...

You can tell this because the products have less energy than the reactants, and the arrow showing the overall change in energy points downwards. In the profile for an endothermic reaction ...

As one mole of every gas will occupy the same volume at a given temperature and pressure, we can use volumes and the molar ratio to calculate volumes of reactants or products. Consider the ...