The responses would be:
C. Bubbles form
E. There is a change in color
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While the chosen answers are indicative of chemical reactions, if you are solely referring to the chemical reaction in your example, these two answers represent the only options.
A chemical reaction occurs when reactants create a new substance. Indicators of a chemical reaction include alterations in smell, color, and temperature. At times, precipitates may develop.
The charge for a single electron is 1.602*10^ -19 C
80 µC can be expressed as 8*10^ - 5 C
This is basic arithmetic
Total Charge divided by the charge of one electron = Number of electrons
(8*10^ -5 C / 1.602*10^ -19 C) equals 4.99 * 10^14 electrons.
Answer:

Explanation:
When calculating Hall voltage, it is crucial to have the current, magnetic field strength, length, area, and number of charge carriers available. The Hall voltage can be expressed using the equation:

Where:
i= the current
B= the magnetic field strength
L = the length
n = the number of charge carriers
e= charge of an electron
We need to replace values and solve for n:



As a result, the charge carrier density is 
solution:
the spring force applied by a spring with spring constant k can be expressed as

where k acts as the spring constant
and x indicates the spring's deformation
to determine the work completed by the spring

the amount of work done by the spring when moving from x=0 to x=L

substituting the limits x=0 and x=L
we derive the work done in terms of k and L


The reaction force is F = -8 N. It is noted that the Earth's gravitational force pulls the toy down with a weight of 8.0 N. This problem utilizes Newton's third law of motion, which states that "for every action, there is an equal and opposite reaction." In a mathematical context, it is illustrated as follows: where the force exerted on one object by another is indicated. In this scenario, the force of Earth acting on the toy is the action force. Consequently, the reaction force is characterized as F = -8 N (the negative indicates that the reaction force is directed upward). In essence, the toy exerts an upward force of 8 N on the Earth, thus comprising the required solution.