A student adds iron filings to a copper(II) chloride solution at room temperature. A balanced equation
for the reaction that occurs is shown below.
Fe(s) + CuCl2(aq) - FeCl2(aq) + Cu(s)
Which of the following changes would most likely
increase the reaction rate?
A. using larger pieces of iron
B. performing the reaction in an ice bath
C. decreasing the volume of the CuCl2 solution
D. increasing the concentration of the CuCl2
solution

i need mutiple choices

it is the most commonly accepted one

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.