The diagram shows the course of the reaction for a chemical reaction. With and without catalyst. R stands for reactant and p stands for product. Which statement or statements are true? 1. H4 and H5 together make up the total enthalpy change of the reaction.❌?
2. The reaction is endothermic.❌
3. The presence of catalyst allows a larger amount to be formed a larger amount of the products.❌?
4. H1 <0 ✅
(EXOTERM h1 <0
(Endotherm h1> 0)
5. The activation energy is higher for the catalyzed reaction ❌?
6. The reaction is exothermic
7. H1 is the total enthalpy change ✅?
Activation energy non-catalyzed reaction = H3? ✅

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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