Unit 5 - Intro to Chem Reactions - Chem Final Exam Review

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What is a synthesis reaction?

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A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex product. Example: @@S + O_2 ightarrow SO_2@@.

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What is a decomposition reaction?

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A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products. Example: @@2H_2O ightarrow 2H_2 + O_2@@.

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What is a combustion reaction?

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A combustion reaction is a type of chemical reaction that occurs when a substance reacts with oxygen, producing energy in the form of heat and light. Example: @@C_3H_3 + 5O_2 ightarrow 3CO_2 + 4H_2O@@.

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What is a single replacement reaction?

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A single replacement reaction is a type of chemical reaction where one element replaces another in a compound. Example: @@Zn + 2HCl ightarrow ZnCl_2 + H_2@@.

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What is a double replacement reaction?

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A double replacement reaction is a type of chemical reaction where two compounds exchange ions or bonds to form two new compounds. Example: @@NaCl + AgNO_3 ightarrow NaNO_3 + AgCl@@.

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What indicates a chemical reaction has occurred?

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Indicators of a chemical reaction include color change, temperature change, gas production, formation of a precipitate, or change in odor.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction. Example: Mixing solutions of BaCl_2 and Na2SO4 produces BaSO4 as a precipitate.

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What is the law of conservation of mass?

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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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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 (e.g., melting ice), while a chemical change results in the formation of new substances (e.g., rusting iron).

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What is an example of a physical change?

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An example of a physical change is the melting of ice into water.