HELP ME PLZ trying to do a assignment in science and im stuck on this question

Study the following reaction carefully. what classification should this reaction have? 4al + 3o2 2al2o3synthesisdecompositionsingle replacementdouble displacement

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?