Answer: The energy required to change water from a liquid to a solid is 333.7 kJ/kg while the energy required to boil water is 2257 kJ/kg. The amount of energy needed to change the phase of water to a gas from a liquid is 540 times the amount of energy needed to raise the same amount of water 1° C
Explanation:
The elements found in the Group 1, or the Alkali Metal Group, have electronic configurations that end in
![s^{1}](https://tex.z-dn.net/?f=%20s%5E%7B1%7D%20)
.This means that they have 1 electron readily available to release in order to achieve a stable state.
When these atoms release the valence electron, they will achieve a stable state. For example, Lithium's stable state will be
![Li^{+}](https://tex.z-dn.net/?f=%20Li%5E%7B%2B%7D%20)
and Sodium will be
![Na^{+}](https://tex.z-dn.net/?f=%20Na%5E%7B%2B%7D%20)
.
The oxidation state will then be +1.
The answer is C.
The net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N. Details about net force can be found below.
<h3>How to calculate net force?</h3>
The net force of a body can be calculated by multiplying the mass of the body by its acceleration as follows:
Force = mass × acceleration
According to this question, a box with a mass of 8.0 kg is sitting on a frictionless surface and experiences an acceleration of 4.0 m/s2 to the right.
Net force = 8kg × 4m/s²
Net force = 32N
Therefore, the net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N.
Learn more about net force at: brainly.com/question/18031889
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Answer:
2,250J
Explanation:
W = Fs = (450)(5) = 2,250
Speed =distance /time
0.75=30/time
Time=30/0.75=40mins