Which of the following combinations will result in a reaction that is spontaneous at all temperatures? A: positive enthalpy change and positive entropy change B: positive enthalpy change and negative entropy change C: negative enthalpy change and positive entropy change D: negative enthalpy change and negative entropy change

What is the empirical formula for c4h8o2

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided