Please help me with this question please just help me with what is this is or synthesis singlereplacement combustion
decomposition
double replacement

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %