Boron oxide (B2O3) decomposes into boron (B) and oxygen gas (O2). What will the ratio of boron and oxygen atoms be? Complete the reaction

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

[tex]\delta h=e_p-e_r[/tex]

[tex]\delta h[/tex]= enthaply

[tex]e_p[/tex] = energy of products

[tex]e_r[/tex] = energy of reactants

as [tex]e_p< e_r[/tex], thus [tex]\delta h[/tex] comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

And a) oxygen i believe

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid