The reaction described by h2(g)+i2(g)⟶2hi(g) has an experimentally determined rate law of rate= some proposed mechanisms for this reaction are: mechanism a (1) h2(g)+i2(g)−→(g) (one-step reaction) mechanism b (1) i2(g)⥫⥬=−(g) (fast, equilibrium) (2) h2(g)+2i(g)−→(g) (slow) mechanism c (1) i2(g)⥫⥬=−(g) (fast, equilibrium) (2) i(g)+h2(g)−→(g)+h(g) (slow) (3) h(g)+i(g)−→(g) (fast) which of these mechanisms are consistent with the observed rate law?

  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-

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.