Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
Like all objects, rockets are governed by Newton's Laws of Motion. The First Law describes how an object acts when no force is acting upon it. So, rockets stay still until a force is applied to move them. Newton's Third Law states that "every action has an equal and opposite reaction".
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The reaction in which more reactive element replace a less reactive element from its compound is called displacement reaction.
Ex:-

Well, an independent variable ids the thing that stays the same and a dependent variable is the thing that changes.