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Week 14 & 15 - Gener al Chemi str y CH EM 151 Week...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 15/14
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UA GenChem Amounts in Chemical Reactions . We have learned to IDENTIFY different types of chemical reactions. But another important aspect of reactions is the question: How Much? We will look at this on both the microscopic and macroscopic levels.
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UA GenChem During a chemical reaction chemical bonds are broken and new bonds are formed. The chemical nature of the substances present in the system changes. Chemical Reactions Microscopic Representation O 2 SO 2 Reactants SO 3 Products SO 2 (g) + O 2 (g) SO 3 not balanced Chemical Equation Only black & White on exam
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UA GenChem Chemical Equations Write the chemical equations that corresponds to the following microscopic representations: X Y We write X 2 + 2 Y 2 2 XY 2 (simplest whole numbers) We see 2 X 2 + 4 Y 2 4 XY 2
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UA GenChem Chemical Equations Write the chemical equations that corresponds to the following microscopic representations: X Y We write 3 X 2 + Y 2 2 X 3 Y We see 6 X 2 + 3 Y 2 4 X 3 Y + Y 2 Remove 1Y 2 from both sides that did not react 6 X 2 + ( 3-1) Y 2 4 X 3 Y + ( 1-1 )Y 2 The reaction is 6 X 2 + 2 Y 2 4 X 3 Y
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UA GenChem Chemical Equations Write the chemical equations that corresponds to the following microscopic representations: X Y We write 3 X 2 + Y 2 2 X 3 Y Count the number of X and Y atoms on both sides. Count the number of MOLECULES on both sides Total of each atoms does not change Total number of molecules can change and often does
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UA GenChem Chemical Equations What reaction is happening in all of these containers. What is it? O S
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UA GenChem In Reactions II and III why did all the molecules NOT react? What is left and Why? Chemical Equations The same reaction is happening in all of these containers. O S 2 S + 3 O 2 2 SO 3 Rx I Rx II Rx III Limiting Reagent (totally consumed) Reagent in excess (left over)
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UA GenChem Chemical Equations The same reaction is happening in all of these containers. What is the outcome of this reaction? Limiting Reactant? O S 2 S + 3 O 2 2 SO 3
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UA GenChem Chemical Equations The same reaction is happening in all of these containers. Again,What is the outcome of this reaction? Limiting Reactant? O S 2 S + 3 O 2 2 SO 3
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UA GenChem Build a microscopic representation of the REACTANTS in following reaction: N 2 (g) and O 2 (g) react to produce NO 2 (g). . . What is the balanced chemical equation?
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UA GenChem Build a microscopic representation of the following reaction: Carbon reacts with oxygen to produce carbon monoxide. Using open and solid circles for atoms, show the situation of the reaction flask AFTER the reaction occurred. Identify LR . What is the balanced equation?
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UA GenChem Chemical Reactions During a chemical reaction chemical bonds are broken and new bonds are formed. The chemical nature of the substances present in the system changes.
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