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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.

The boiling points of the elements in Group 7 tend to increase as you go down the group because the molecules get larger and the intermolecular forces get stronger.

In graphite, each carbon atom is covalently bonded to three other carbon atoms. One of the four outer shell electrons of each carbon atom is therefore not engaged in bonding, and becomes delocalised. Thes...