Answer:
hot air rises because gases expand as they heat up.When air heats up and expands,its density also increases.The warmer,less dense air effectively floats on top of the colder, dense air below it. This creates a buoyant force that causes warmer air to rise.
cold air sinks because it is heavier as its more dense ( because of closely packed molecules) soits harder for them to move and they absorb less energy. Also, gravity pulls on it more strongly.
Hope it helps :)
The current needed to deposit all of the nickel in 5 hours is 2.219 A
<h3>
What is Faraday's Law of electrolysis?</h3>
According to the first law of Faraday, the amount of substance liberated at an electrode is directly proportional to the quantity of charge passed through an electrolyte.
m = zq , where z = electrochemical equivalent
An electrochemical equivalent is the mass of the substance liberated at an electrode when 1 Columb of charge is passed through the electrolyte.
For the nickel,
![Ni^{2+} (aq) + 2e^- \rightarrow Ni (s)](https://tex.z-dn.net/?f=Ni%5E%7B2%2B%7D%20%28aq%29%20%2B%202e%5E-%20%5Crightarrow%20Ni%20%28s%29)
z = 2
The molar mass of NiS0₄ = 154.75 g
154.75 g of Ni needs 2 x 96485 C
32 g of Ni needs ![\frac{2\times 96485\times 32}{154.75} \\](https://tex.z-dn.net/?f=%5Cfrac%7B2%5Ctimes%2096485%5Ctimes%2032%7D%7B154.75%7D%20%5C%5C)
32 g of Ni needs 39944.79 C
We know,
q = It
Where q = charge
I = current and t = time in seconds
q = 39944.79 C and t = 5 x 60 x 60 = 18000 s
![I = \frac{q}{t} \\ = \frac{39944.79}{18000}](https://tex.z-dn.net/?f=I%20%3D%20%5Cfrac%7Bq%7D%7Bt%7D%20%5C%5C%20%20%20%20%20%3D%20%5Cfrac%7B39944.79%7D%7B18000%7D)
= 2.219 A
Hence, the current needed to deposit all the nickel is 2.219 A in 5 hours
Learn more about Faraday's law of electrolysis:
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Answer:
Reason Down below
Explanation:
It is important because when you make observation you get a clue sometimes and it reactants i feel like it also takes places with observation. :)
29. B) A population changes in response to a change in the environment.
<u>Evolution is the process by which new species of organisms develop from earlier forms. Most often, in response to a change in a species environment. It's the frequent change of the alleles in a population. </u>
30. A) Describes the relationship between an organism and its environment
<u>Darwin made this theory of evolution by natural selection as an explanation for adaptation. Darwin defined natural selection as the </u>
<u>"principle by which each slight variation, if useful, is preserved."</u>
Answer:
the correct option is:
We only need one electron to achieve a noble gas configuration
Explanation:
Halogens have 7 valence electrons in their outer energy shell, so when reacting with another element they satisfy the octet rule.
Halogens show trends in their binding energy from top to bottom on the periodic table with fluoride showing minimal deviation. They are shown to have strong bonding energy with other atoms but weak interactions with the F2 diatomic molecule. This means that as you go down the periodic table the reactivity of the element decreases due to the increase in the size of the atom.
Halogens are highly reactive, so they can be harmful to biological organisms in sufficient quantities. Its high reactivity is due to the high electronegativity that its atoms present due to its highly effective nuclear charges.