What is the formula for Ba+2 and F-?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.