A nickel coin is a mixture of metals called an alloy. It is 75% copper and 25% nickel. Design and conduct an experiment to find out how many nickel and copper atoms there are in one 5 cent coin.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

give me abc and i will get it for u.