HELP! I WILL GIVE BRAINIEST AND 20 POINTS what is a hypothesis? give an example of a hypothesis

By definition:

A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.A proposition made as a basis for reasoning, without any assumption of its truth.

Example:

If I study hard in school, I will get good grades.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na