1) a controlled experiment is one in which only a is changed.
2) a chemical bond formed by the sharing of electrons is bonding.
3) if a solution has a ph with a high concentration of hydrogen ions (h+) it is considered a(n) solution

1) variable  2) ionic bonding 3) basic solution

Explanation:

1) An experiment in which an observer tests a hypothesis by looking for changes brought on by alterations to a variable. In a controlled experiment, an independent variable is the only factor that is allowed to be adjusted, with the dependent variable as the factor that the independent variable will affect.

2) Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.

3) A solution with a high number of hydrogen ions is acidic and has a low pH value, known as basic solution