A combustible substance cannot catch fire or burn as long as its temperature is lower than its ignition temperature. Please explain this with a suitable activity. (PLEASE DON'T WASTE MY POINTS)

Can someone me with these questions plz.

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.