Construct a word equation for the burning of hydrogen ​

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

What is a number added in front of a formula in order to balance the equation