Which statement correctly describes a physical change? involves breaking and creating chemical bonds but not changing a phase
B. may involve a change in phase but does not involve a change in the molecular structure
OC. may involve converting two or more substances into new substances
D. involves changes at the molecular level
involves energy transfer and change in color

what is the question?

it is the most commonly accepted one

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.