This is about thermal physics, not a chemical question at all. If there's no energy lost from the system then, energy lost by hot substance cooling down = energy gained by cold substance heating up. Where mc(T(hot) - T(equilibrium) ) = mc (T(equilibrium) - T(cold)) where m = mass c = specific heat capacity T … Read more

When an atom gains or loses protons, it becomes a isotope. Chemical properties are related to the number of electrons so isotopes of the same element have identical chemical properties. Since their mass is different their physical properties such as density and boiling point are different.

All atoms of the same elements must contain the same number of protons, however they may contain a different number of neutrons. Such atoms are known as isotopes. Chemical properties are related to the number of electrons so isotopes of the same element have identical chemical properties. Since their mass is different their physical properties … Read more

The answer depends on what kind of formula do you want. Empirical, molecular or structural. Formulas for empirical and molecular for the lead(IV) oxide are the same. Which is PbO2 if you are asking for structural formula, the answer should be 　　　Ｐｂ 　／／　＼＼　　 Ｏ　　　　　Ｏ (IV) after the lead states that the oxidation number of it … Read more