What type of reaction takes place when the melting of a solid occurs? combination reaction endothermic reaction exothermic reaction precipitation reaction combustion reaction

Option (b) is the correct answer.

Explanation:

In a solid, molecules are closely held together by strong inter molecular forces of attraction. As a result, the molecules are not able to move freely in a solid state.

So, when a solid absorbs heat or is heated at high temperature then intermolecular forces between the molecules break. As a result, molecules start to move randomly and thus they gain kinetic energy.

For example, ice cube melts at room temperature because it absorbs heat from the surrounding.

Also, it is known that in an endothermic reaction heat is absorbed by reactants in a chemical reaction whereas in a exothermic reaction heat is released in a chemical reaction.

Thus, we can conclude that endothermic reaction takes place when the melting of a solid occurs.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.