URGENT PLEASe HELP



Balance the following chemical equations. (please) Also, please explain each one briefly so I understand. Thanks in advance! (unless the answer is useless) I don't know if any of these make sense I'm just writing what I see on the paper.)


___CH4 + __O2 -----> ____ CO2 + ____H2O


____AgI + ____Na2S ------> ____Ag2S + ____NaI


____NH3 + ____O2 ------> _____NO + _____H2O


_____SiO2 + ___HF ----> ______SiF4 + ____H2O