Which of the following are physical properties of matter a. size, shape, and color b. phase of matter and temperature c. density, solubility, and hardness d. all of these

The correct answer is D. All of the above

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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.