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There are two hydrogen atoms in the formula. Therefore you place a two in front of the H in the chemical formula. In the end, you have 2 hydrogen atoms and 1 oxygen atom.

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The atoms rearrange during the reaction because matter can neither be created nor destroyed.

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There's no new mass created when the light bulb. Light has no mass.

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Why does the formula change?

Answer:
The chemical formula changes when an oxygen atom is created during the chemical reaction. During a chemical reaction, the atoms are moved around. To obey the law, the equation must be balanced.

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The law that states that mass can not be created or destroyed during ordinary physical and chemical changes.

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The basic building block of matter.

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A shorthand way to use chemical symbols and numbers to represent a substance.

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https://www.youtube.com/watch?v=3lHHOiTdmK4

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Vacation or Conservation (Of Mass): Crash Course Kids #23.1

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How do you balance a chemical equation?
Answer:
To balance out the equation, a number must be placed in front of the formula. Meaning you're adding energy to the existing equation.

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When you have to write a chemical formula after a chemical reaction has happened, conservation of mass might come into play. The order of the elements and number of elements will often be different afterwards, though not gone because matter cannot be created or destroyed so the conservation of mass can help you make sure to have all of the elements accounted for and the chemical formulas written correctly. This also applies to everyday life, for instance, when you leave a cup of water out, over time some of the water will dissapear, the water doesn't just leave it simply is rearanged when it goes into the air. Instead of being the chemical formula of H₂O it becomes 2H₂O₂. It also applies to many other things.

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Bold terms in your reading
Must be defined
Include image if applicable

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Matter cannot be created or destroyed.