Consider the following reaction. what is the change in enthalpy in kj/mol?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules