If there are 6 waves in a 2-second time frame, what is the frequency

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it