Which of the following is an example of how a scientist might use a model? a. the end of a slinky is moved vertically up and down to simulate a wave b. a wrench is used to tighten a nut onto a piece of wood c. stopwatches measure the amount of time it takes for runners to complete a mile d. microscopes are used to magnify a group of cells on sets of slides

D Microscopes

because they use them for DNA

a,b,and c, all you an item that can be used and not tested with.

The answer is 100% A

The slinky is the model... it simulates a wave.

A wrench, stopwatch, or microscope is not a model.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.