30 points will give brainliest to first answer Answering to the ones place
what is the pH of a 0.0001 M solution of HCl?

Bohr's model could only explain the spectra of which type of atoms? single atoms with one electron single atoms with more than one electron bonded atoms with one electron bonded atoms with more than one electron

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus