Calculate the mass of Helppp pleaseee
hydrogen formed when 25 grams of aluminum
reacts with excess hydrochloric acid.
2Al + 6HCl + Al_C16 + 3H2
0.41 g
1.2g
1.89
2.8 g

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

Describe the forces both attractive and repulsive that occur as two atoms move closer together.