Explanation:
We know that,
Energy = .......... (1)
and, Energy = ............ (2)
Now, equating both equations (1) and (2) as follows.
=
v =
=
=
= m/s
or, = 18 km/s
Thus, we can conclude that initial speed the electron must have in order to reach an infinite distance from the sphere and have zero kinetic energy when it gets there is 18 km/s.
The reaction is an exothermic reaction and the temperature change is calculated using the formula below:
- Change in temperature = final temperature - initial temperature
<h3>What kind of heat change occurs when anhydrous copper(II) sulfate is dissolved in water?</h3>
When, anhydrous copper(II) sulfate is dissolved in water, heat is given off to the surroundings and the temperature of the solution formed is higher than the temperature of the water used in dissolving it.
This type of reaction is known as an exothermic reaction.
The temperature increase is calculated using the formula below:
- Change in temperature = final temperature - initial temperature
In conclusion, exothermic reactions result in increase in temperature of their surroundings.
Learn more about exothermic reactions at: brainly.com/question/2924714
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The solvent for the mixture is water
<em><u>Explanation</u></em>
- <em><u> </u></em>Solvent is substance that dissolves the solute in a solution.
- solvent must be present at a higher percentage as compared to solute.
- water is the solvent in a homogeneous mixture that consists 12% ethanol, 28% methanol and 60% water, since it contain more % than ethanol and methanol.
In bleaching a stain, you see that the stain fades, and doesn't come back, which indicates that it has undergone a change.
Buring a match, you would see the ashes, and that it cannot be it's original substance again.
In rusting of an iron nail, the nail cannot be unrusted easily, which indicates that it has been through a chemical reaction.
Answer:
1 x 10^-12 mol dm^-3
Explanation:
[H+] = 10 ^ -pH
Therefore, pH 12 = 1 x 10^-12 hydrogen ion concentration