Chemical Formulas and Equations

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What is written before the arrow in a chemical equation?

The Law of conservation of mass states that:

The large number that is written before a symbol or formula is called a:

The substances that exist before the reaction begins are called:

What is written after the arrow in a chemical equation?

This occurs naturally and cannot be changed:

In an exothermic reaction, the product will feel:

In an endothermic reaction, the product will feel: