Conditions under which metals react with water

Reactions of Metals with Water

Metals with moderate to low reactivity react very slowly with water. However, they react moderately with steam when heated and give hydrogen gas and metal oxides. Metals low in the metal reactivity series do not react with water even at high temperature.

Explanation:

Order of reactivity                     Metal               Reactions with water or steam

↑                                           sodium (Na)         Vigorous reaction with cold water

↓                                        calcium (Ca)    Less vigorous reaction with cold water

least reactive           magnesium (Mg)    Slow reaction with cold water, vigorous                                                                                                   .                                                                 with hot water

i would say b

explanation:

but i think i would need more information than that

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.