Hematite is a naturally occurring mineral and a common form of iron ore. The following statements describe physical and chemical changes occurring to hematite. Which statement describes a chemical change?

Chemical change, all matter is made up of tiny particles we call atoms or molecules. Properties related to the atomic or molecular structures of substances are called chemical properties. Properties such as burning, rotting, rusting, compounding are chemical properties.

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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the answer is 303.15 or 303