1. What are the ways in which matter and energy can interact?

Einstein tells us that the relationship between energy and matter is defined by the equation  E = M C 2 , where E is energy, and M is mass.

Explanation:

By looking at Einstein's equation we can see that matter (or something that has mass) and energy are actually the same thing

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.