Which of the following pairs of elements will form covalent bonds with each other? PLEASE HELP

Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.

If the molar mass of the compound is 96.69 g/mol, what is the molecular formula of the compound?

During an acid-base titration, when do the contents of the beaker consist of only water, a salt, and a trace of indicator?