Indices and Standard Form introduces index notation and writing numbers using index notation. There is a nice description of what x to the power of n means which is useful to start this topic off.
The laws of indices contains explanations, examples and exercises including a formal proof of the rules of indices and an explanation of why x^0 = 1. Students could be asked to investigate the laws for themselves.
Negative indices shows that a to the power -1 means the same as 1/a. The term reciprocal could be introduced here. It would be useful to recap arithemetic with negative numbers as a starter since some questions require students to perform calculations such as 4 - (- 3).
Fractional indices link to roots and powers. There is a useful 'true or false' exercise in question 5, which can be used to highlight common misconceptions and could be used as a mini-plenary to check students' understanding.