Which of the following equations is balanced?

2h2+o2—2h20

2na+ o2–2na20

fes+hci —2fecl2 + h2s

in need of with chemistry!

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Drug abuse will not lead to physical and psychological dependence. true or false ?