F. Give reason for the following
1. Gases exert pressure in all direction. 2. All temperatures in the absolute Kelvin scale are in positive figures.
3. Combustion of carbon is an exothermic reaction.
4. M shell can contain maximum 18 electrons.
5. Helium can accommodate masimum two electrons only.
Answers
Answer:
1 The molecules of a gas move apart, when they collide with other gas molecules. They bounce all around the container. Gravity also has a very little effect on them because of their small size. So these move randomly exerting pressure in all directions
2. 0 K or absolute zero is the lowest temperature on the Kelvin temperature scale and considered as the lowest temperature possible. This is the reason that all temperatures on the Kelvin scale are in positive figures.
3. Combustion is an exothermic oxidation reaction, with materials such as hydrocarbons reacting with oxygen to form combustion products such as water and carbon dioxide. The chemical bonds of the hydrocarbons break and are replaced by the bonds of water and carbon dioxide.
4. Don't know sorryyy!!
5. The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins
Explanation:
hope this was useful!