What needs to be done to balance this equation? Question options:

Add coefficient 2 to O 2 on the left side of the equation.

Remove coefficient 2 in front of H 2O on the right side of the equation.

Change O 2 to O 4 on the left side of the equation.

Do nothing (equation is balanced).

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?