Not all substances heat up and cool down at the same rate. A substance's resistance to temperature change is described by its specific heat capacity, or specific heat for short. For example, the specific heat of iron is 0.46 J/g °C. That means it takes 0.46 joules of heat energy to increase the temperature of a gram of iron by one degree Celsius.

Iam not sure butch i thinnk it is ab

Ithink the answer is d.

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m