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Graded Assignment Science | Unit: Reaction Rates and Equilibrium | Lesson: Mid-Unit Test
Name: Emma Arnone Date: 5/3/2022
Graded Assignment
Mid-Unit Test, Part 2
Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for
full credit.
(8 points)
1. This energy diagram is for the thermal decomposition of solid mercury (II) oxide (also Score
known as mercuric oxide) into liquid mercury and oxygen gas.
Click or tap here to enter text.
A graph. The x-axis is labeled Reaction pathway. The y-axis is labeled Energy. Adashed horizontal line labeled Reactants is plotted at about one-fifth across the y-axis. A dashed horizontal line labeled Activated complex is plotted near the top of the y-axis. A line labeled Products is plotted on the graph. Products starts a t the origin of Reactants, extends horizontally to the right, curves upward to the right with downward opening until Activated complex, slightly curves downward to the right, and extends horizontally to the right. The distance between Reactans and Activated co mplex is labeled (a).
Write a balanced equation for the reaction.
Explain what feature is shown by the arrow labeled (a).
Using chemical symbols and dashed lines (this can be done with type), draw what the activated
complex or transition state might look like.
Is this reaction exothermic or endothermic? Explain.
Answer: 2 HgO(s) → 2 Hg(l) + O2(g)
The feature indicated by line (a) is Activation energy Hg- - -O
The reaction is Endothermic due to the energy of products being higher than energy of the reactant.
(8 points)
2. The diagram below shows steps in the exothermic chemical reaction of bromomethane Score
with hydroxide to form methanol and bromide ion. The black spheres are carbon atoms,
the white spheres are hydrogen atoms, the red spheres are oxygen atoms, and the blue Click or tap here to enter text.
dots are bromine atoms.
Three molecular structures labeled A, B, and C. A. Two group s of circles. The first group is composed of a white and a red circle. To the right is a black circle in the middle with three small white and one large blue circles attached on it. B. Two groups of circles. The first group is composed of a red circle with a small white circle attached on it, attached to a black circle with three small white circles attached on it. To the right is a big blue circle. C. A group of circles. A small white circle is attached on a red circle. The red circle is attached to a black circle. Three small white circles are attached on the black circle. A big blue circle is attached on the black circle.
Write a balanced chemical equation to represent the reaction.
Using the figures in the diagram, draw the steps of the reaction in the correct order, label each
molecule in the drawings, and describe what is happening in the reaction.
© Stride, Inc. All rights reserved. No reproduction without written consent of Stride, Inc. Page 1 of 3
about:blank
featuring complete and verified
Chemistry
questions
5.08
andUnit
answers
Test Pt
designed
2Chemistry
EArnone.pdf
to strengthenChemistry
5.08 Unit Test Pt 2 EArnone.pdf1/3 Pt 2 E
5.08 Unit Test
featuring PM
complete and verified
Chemistry
questions
5.08Chemistry
andUnit
answers 5.08
Test Pt Unit Test
designed
2Chemistry
EArnone.pdfPt 2 EArnone
to strengthenChemistry
5.08 Unit Test Pt 2 EArnone.pdf
5.08 Unit Test Pt 2 E
Graded Assignment Science | Unit: Reaction Rates and Equilibrium | Lesson: Mid-Unit Test
Name: Emma Arnone Date: 5/3/2022
Graded Assignment
Mid-Unit Test, Part 2
Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for
full credit.
(8 points)
1. This energy diagram is for the thermal decomposition of solid mercury (II) oxide (also Score
known as mercuric oxide) into liquid mercury and oxygen gas.
Click or tap here to enter text.
A graph. The x-axis is labeled Reaction pathway. The y-axis is labeled Energy. Adashed horizontal line labeled Reactants is plotted at about one-fifth across the y-axis. A dashed horizontal line labeled Activated complex is plotted near the top of the y-axis. A line labeled Products is plotted on the graph. Products starts a t the origin of Reactants, extends horizontally to the right, curves upward to the right with downward opening until Activated complex, slightly curves downward to the right, and extends horizontally to the right. The distance between Reactans and Activated co mplex is labeled (a).
Write a balanced equation for the reaction.
Explain what feature is shown by the arrow labeled (a).
Using chemical symbols and dashed lines (this can be done with type), draw what the activated
complex or transition state might look like.
Is this reaction exothermic or endothermic? Explain.
Answer: 2 HgO(s) → 2 Hg(l) + O2(g)
The feature indicated by line (a) is Activation energy Hg- - -O
The reaction is Endothermic due to the energy of products being higher than energy of the reactant.
(8 points)
2. The diagram below shows steps in the exothermic chemical reaction of bromomethane Score
with hydroxide to form methanol and bromide ion. The black spheres are carbon atoms,
the white spheres are hydrogen atoms, the red spheres are oxygen atoms, and the blue Click or tap here to enter text.
dots are bromine atoms.
Three molecular structures labeled A, B, and C. A. Two group s of circles. The first group is composed of a white and a red circle. To the right is a black circle in the middle with three small white and one large blue circles attached on it. B. Two groups of circles. The first group is composed of a red circle with a small white circle attached on it, attached to a black circle with three small white circles attached on it. To the right is a big blue circle. C. A group of circles. A small white circle is attached on a red circle. The red circle is attached to a black circle. Three small white circles are attached on the black circle. A big blue circle is attached on the black circle.
Write a balanced chemical equation to represent the reaction.
Using the figures in the diagram, draw the steps of the reaction in the correct order, label each
molecule in the drawings, and describe what is happening in the reaction.
© Stride, Inc. All rights reserved. No reproduction without written consent of Stride, Inc. Page 1 of 3
about:blank
featuring complete and verified
Chemistry
questions
5.08
andUnit
answers
Test Pt
designed
2Chemistry
EArnone.pdf
to strengthenChemistry
5.08 Unit Test Pt 2 EArnone.pdf1/3 Pt 2 E
5.08 Unit Test
