Answer:
cold
Warm air lifted over a moving cold air mass will produce a _____ front.
The mass of oxygen and hydrogen must be equal to the mass of the substance they create the water. So if the hydrogen is 2.8 g the oxygen must account for the rest of the mass. Basically just subtract 25.4-2.8=mass of oxygen
False. Pb is lower than Al in the reactivity series. It cannot replace aluminium in AlCl3