Chemistry, 30.07.2021 19:30 bsheepicornozj0gc

SiO2 has a melting point of 1700°C, whereas CO2 has a melting point of -78°C. What is the reason for this huge difference between two elements in the same group?

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Answer from: Chewbacka2020

The difference is because SiO2 is solid while CO2 is gaseous

Silicon and carbon are two elements that belong to the same group (Group 4) of the periodic table. They, however, both form oxides. Silicon bonds to two oxygen atoms to form silicon dioxide (SiO2) while carbon also bonds to two oxygen atoms to form CO2. According to this question, SiO2 has a melting point of 1700°C, whereas CO2 has a melting point of -78°C. The huge difference in the melting point values can be attributed to the state at which both molecules exist. SiO2 is a solid, hence, will require great heat to break the strong intermolecular forces that hold it's molecules. On the other hand, CO2 is a gas.

The difference is the melting point values despite belonging to the same group is their STATE OF MATTER.

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Answer from: Quest

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

Answer from: Quest

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( $n_2$ ) .

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.

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SiO2 has a melting point of 1700°C, whereas CO2 has a melting point of -78°C. What is the reason for...

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