A researcher is trying to identify whether household substances are basic. Which approach would BEST help investigate whether substances are basic?
A Mix each substance with a weak base and record the results.
B. Test each substance with blue litmus paper.
C. Observe each substance and record its color.
D. Test each substance with red litmus paper.

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.