Suppose the following exothermic reaction is allowed to reach equilibrium. a(g) + 3b(g) ⇋ 2c(g) + 3d(g)then we make each of the following changes and allow the reaction to reestablish equilibrium. tell whether the amount of b present at the new equilibrium will be (i) greater than, (ii) less than, or (iii) the same as the amount of b before the change was imposed.(a) the temperature is decreased while the volume is kept constant; (b) more a is added(c) more c is added(d) a small amount of d is removed; (e) the pressure is increased by decreasing the volume

(a) The temperature is decreased while the volume is kept constant;

Because the reaction is exothermic when we decrease the temperature the equilibrium will shift to the right.

The amount of B will be (ii) less than before the change was imposed.

(b) more A is added

Equilibrium is shifted to the right.

The amount of B will be (ii) less than before the change was imposed.

(c) more C is added

Equilibrium is shifted to the left.

The amount of B will be (i) greater than before the change was imposed.

(d) a small amount of D is removed

Equilibrium is shifted to the right.

The amount of B will be (ii) less than before the change was imposed.

(e) the pressure is increased by decreasing the volume

The equilibrium will shift to the part where we have a lower number of moles which is the left side.

The amount of B will be (i) greater than before the change was imposed.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.