Select the correct answer from each drop-down menu.
00
when a liquid is cooled, the kinetic energy of the particles
the space between the particles
between the particles
, and the matter changes its state to solid.
i

When a liquid is cooled, the kinetic energy of the particles decrease and the space between the particles also decrease, and the matter changes its state to solid.

Liquid is the state of matter which is one of the fluid, and its denser than gases but rarer than solids. The particles of liquid have a particular amount of kinetic energy which depends on the temperature of the liquid. As the temperature is decreased, the energy content of the matter as a whole decreases. This in turn, decrease the energy levels of individual molecules, and the kinetic energy of the molecule also decrease.

As the kinetic energy of the molecules decrease, the collision between the molecules decrease. This brings the molecules closer, binding them into the van der Waal's force. Thus they condense into solids.

d. temperate deciduous forest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.