Which is a characteristic of a decomposition reaction?
a. substance p replaces x in the compound xy.
b. substance xyz breaks down into x, y, and z.
c. substance z burns in the presence of oxygen to form zo.
d. substance x combines with y to form compound xy

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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c is the answer because when something is left after something evaporates that shows the chemical change.