Answer:
Generally, a solid changes into liquid and then into gas state.
But the process of transistion of solid directly into gas without passing throuhg the intetmidiate stage, liquid is called sublimation.
Some of uses of sublimation are:
- Sublimation helps to dry substance within getting moist. This process of sublimation is also beneficial in medicine.
- Piriciple of sublimation is used in air freshener solids used in room and toilets.
- Dry ice is the solid form CO2 gas whose sublimation is used as cooling agent and storing dead bodied.
- Camphor, a substance used in houseold sublimes to give a pleasant smell inside the house.
Answer:
Option (A) 3.6 hours
Explanation:
Data obtained from the question include:
Current (I) = 22.2A
Time (t) =..?
Next, we shall determine the quantity of electricity needed to reduce 1 mole of Al^3+ to aluminium metal.
This is illustrated below below:
Al^3+ + 3e —> Al
From the above equation, 3 electrons are needed to reduce 1 mole of of Al^3+ to aluminium metal.
Recall:
1e = 1 Faraday = 96500C
Therefore, 3e = 3 x 96500C = 289500C.
Therefore, 289500C of electricity is needed to reduce 1 mole of Al^3+ to aluminium metal.
Next, we shall determine the time taken for 289500C of electricity to reduce 1 mole of Al^3+ to aluminium metal using a current of 22.2A. This can be achieved as follow:
Quantity of electricity (Q) = 289500C
Current (I) = 22.2A
Time (t) =..?
Q = it
289500 = 22.2 x t
Divide both side by 22.2
t = 289500/22.2
t = 13040.5 secs.
Finally, we shall convert 13040.5 secs to hours. This is illustrated below:
3600 s = 1 hr
Therefore, 13040.5 s = 13040.5/3600 = 3.6 hrs
Therefore, the time taken for the reaction is 3.6 hours
Acids are ionic compounds with hydrogen at the front. Bases are ionic compounds with hydroxide at three back(bronsted definition)
A conjugate acid is a base that has gained a proton(hydrogen ion) and a conjugate base is formed when an acid has given up its proton.
The main cause of increased erosion is natural elements like rain, wind and ice. Erosion is the process by which the surface of the Earth gets worn down.
Soil erosion is also a big thing, it is caused by mostly rain that contributes to floods. This stuff is bad for farmers because they do a lot of farming and with erosion increasing the growing crops are decreasing because of erosion.
Answer:
Earth rotates from west to east
Explanation:
hope it helps
