Heat is released when h2 gas and o2 gas react to form h2o. why?
a. breaking the h–h bond in h2 gas releases heat.
b. breaking the o–o bond in o2 gas releases heat.
c. forming the h–o bonds in h2o releases heat.
d. both a and b are responsible for heat being released in the reaction.
i guessed d

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth