7H FLASHCARD- on Law of Conservation of Mass

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What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

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What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

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What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

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What happens to atoms during a chemical reaction?

Back

Atoms rearrange to form new substances, but they are not created or destroyed.

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What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature.

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases heat to its surroundings, resulting in an increase in temperature.

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What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.

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What is a product?

Back

A product is a substance that is formed as a result of a chemical reaction.

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula that indicates how many molecules or moles of that substance are involved in the reaction.

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How can you tell if a chemical equation is unbalanced?

Back

A chemical equation is unbalanced if the number of atoms of each element is not the same on both sides of the equation.