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Let’s start be thinking what exactly is a reaction. It takes place as an interaction between two or more particles. For that to happen, they must get close. Really close. And fast. Fast because otherwise ...

Na has more electron shells/ energy levels than Li. This means that Na has a greater atomic radius than Li. Therefore, the outer shell electron in Na experiences a weaker nuclear attraction than in Li. Le...

First, we can look at the number of hydrogens on either side. The equation shows 8 hydrogen atoms on the left hand side (in C3H8) whereas on the right hand side, we have 2 hydrogen atoms (in H2O). So we n...

1. Increase the temperature - this increases the kinetic energy of particles, so when they collide with each other the collision has a greater energy so is more likely to overcome the activation en...

They have the same number of 'free electrons' in their outer ring. They both have 7 free outer electrons, this means that all group 7 elements have 7 free outer electrons.