5.0 Chemical Reactions

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What is an endothermic reaction?

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

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NGSS.HS-PS1-4

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What is an exothermic reaction?

Back

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

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NGSS.HS-PS1-4

Front

What does the Law of Conservation of Mass state?

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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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NGSS.HS-PS1-7

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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 in a balanced equation that indicates the number of molecules or moles of that substance.

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What is a subscript in a chemical formula?

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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 is a chemical reaction?

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A chemical reaction is a process that transforms one set of chemical substances (reactants) into another set (products) through breaking and forming chemical bonds.

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What is the purpose of balancing chemical equations?

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The purpose of balancing chemical equations is to ensure that the same number of each type of atom appears on both sides of the equation, adhering to the Law of Conservation of Mass.

Tags

NGSS.HS-PS1-7

Front

What happens to the coefficients when balancing a chemical equation?

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When balancing a chemical equation, we change the coefficients to ensure that the number of atoms for each element is equal on both sides.

Tags

NGSS.HS-PS1-7

Front

What is the difference between a physical change and a chemical change?

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A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes a change during a chemical reaction, starting materials that are transformed into products.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5