Answer:
Ice is less dense than water because of the way it forms a hexagonal crystalline structure. Each water molecule consists of two hydrogen atoms bonded to the bottom of an oxygen atom. ... In the winter, temperatures in a lake get close enough to freezing that the colder water is less dense and floats to the top
Explanation:
Answer:
Kb = 1.6*10^-6
Explanation:
The given reaction is:
The ionization constant of the base Kb is given as:
![Kb = \frac{[N2H5+][OH-]}{[N2H4]}------(1)](https://tex.z-dn.net/?f=Kb%20%3D%20%5Cfrac%7B%5BN2H5%2B%5D%5BOH-%5D%7D%7B%5BN2H4%5D%7D------%281%29)
The pH = 10.66
therefore, pOH = 14-pH = 14-10.66 =3.34
![[OH-] = 10^{-pOH} =10^{-3.34} =4.57*10^{-4} M](https://tex.z-dn.net/?f=%5BOH-%5D%20%3D%2010%5E%7B-pOH%7D%20%3D10%5E%7B-3.34%7D%20%3D4.57%2A10%5E%7B-4%7D%20M)
[N2H5+] = [OH-] = 4.57*10^-4M
[N2H4] = 0.133 M
Based on eq(1)
![Kb = \frac{[4.57*10^{-4}]^{2}}{[0.133]}=1.6*10^{-6}](https://tex.z-dn.net/?f=Kb%20%3D%20%5Cfrac%7B%5B4.57%2A10%5E%7B-4%7D%5D%5E%7B2%7D%7D%7B%5B0.133%5D%7D%3D1.6%2A10%5E%7B-6%7D)
Answer:
Natural gas
Explanation:
Natural gas is a gaseous fossil fuel produced from organic matter that is used to heat homes and cook food.
Natural gas is one of the most volatile part of hydrocarbons that exist together with fossil fuel.
- In a reservoir, natural gas is usually on top of the fossil fuel reserve.
- It can also be distilled from crude oil as they rises up on top of the column first due to their low boiling point
- The gas mixture is made up light hydrocarbons from methane to hexane.
Ground state of Al is 1s²2s²2p⁶3s²3p¹.
Exited state of Al is 1s²2s²2p⁶3s¹3p².
Answer:
Tundra
Explanation:
In physical geography, tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons.
