Each pure substance has characteristic physical and chemical properties that can be used to identify it. Compare and contrast physical properties and chemical properties of a substance. Give and example for each:

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

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.