Energy and chem rxn 2022 Prachi Patel
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CHM 11100
Activities and Explorations:
10 points, Due November 20 at 11:59 PM
Claim, Evidence, Reasoning (CER) – Energy and chemical reactions
Instructions:
Upload your work on this page to Brightspace by typing or writing your responses
and saving the file as a pdf file with your first and last name and uploading that file. You can also
take pictures of your written work and paste them in!
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Learning Objectives
6.1-6.2: Energy and Energy changes in chemical reactions
Distinguish between exothermic and endothermic reactions.
Describe the factors that affect the amount of heat change for a process.
6.5 Calorimetry
Use quantitative relationships related to energy including specific heat and
calorimetry.
Question
:
How does the amount of energy released (the heat change) vary per gram and per
mole between two experiments for calcium chloride?
In this CER activity you will need to
complete a data table.
The claims are given to you.
Data and Observations
:
A team of students recorded the following data by dissolving a known
mass of CaCl
2
in 100.0 mL of water.
They noticed that the temperature increased for each
sample (data not shown, but reflected in the negative sign for the q
system
).
They went on to
calculate q
system
, the heat change for the dissolution of each sample.
1.
(2 pts.) Complete the table below and
show your work
. The molar mass for CaCl
2
is
110.98 g/mole. Be sure to get your answer in the correct units!
Data and calculations
Sample
CaCl
2
Mass CaCl
2
(g)
Calculated q
system
,
heat change for
the dissolution (J)
Heat change per mole
CaCl
2
(kJ/mol)
Sample #1
1.142
-824
-80.0
Sample #2
2.803
-2050
-81.3
CHM 11100
Claim A:
The amount of energy released increases with the amount of CaCl
2
dissolved.
Claim B: The heat change per mole is nearly constant between the two experiments.
(Yes, we’ve provided both claims.)
2.
(2 pts.) What evidence do you have from the data table and description of the experiment
that could be used to help support the claims? Describe at least 2 pieces of evidence
The amount of energy released does increase with the amount of CaCl
2
dissolved.
At 1.142
g, the heat change (energy released) is -824 J and at 2.803 g it is -2050 J. This shows that
more energy is being released because the number of heat change is becoming more negative
and increase as more amount of CaCl
2
is dissolved. Another evidence is because of the
CHM 11100
energy being released more is because of the temperature increasing. If the temperature
increases, the heat change will become more negative. The description of the experiment
even claimed that they noticed that the temperature increased for each sample.
3.
Reasoning to support Claim A: Connect your evidence to Claim A
.
(2 pts.) Define the system & surroundings
(1 pt) Discuss how heat flows in this chemical system (to the surroundings from
the system, or to the system from the surroundings – how do you know?) based
upon the data table and the description of the experiment. You can draw a picture
if that helps!
(1 pt) Use the data in the table to help you support your claim!
The system would be the CaCl
2
dissolved in water. The surrounding would be everything around
it, including the atmosphere and beaker the CaCl
2
was dissolved in.
The heat flow is system to
its surrounding. From the data I know the heat flow is exothermic going from the system to the
surrounding because heat change is negative. If the heat change is negative, it is exothermic and
energy is being released.
4.
Reasoning Claim B:
Connect your evidence – the data table -
to your claim.
(2 pts) Use the values you found to fill out the table to support Claim B.
The heat change per mole is nearly constant between the two experiments.
After I found my
values for heat change per mole CaCl
2,
the number for sample 1 was -80.0 kJ/mol and the number
for sample 2 was -81.3 kJ/mol. As you can see, the number for really close to each other which
can support claim B.
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Caleb Young
Oklahoma - CHEM 1315 (Section 001) - Fall20 - ROCHER > Activities and Due Dates > Week 15 Recitation
O Assignment Score:
50%
Resources
O Hint
Check Answer
Question 9 of 10 >
When methanol, CH, OH, is burned in the presence of oxygen gas, O,, a large amount of heat energy is released. For this
2:
reason, it is often used as a fuel in high performance racing cars. The combustion of methanol has the balanced,
thermochemical equation
CH,OH(g) + 0,(g) → CO,(g) + 2H,O(1)
AH = –764 kJ
How much methanol, in grams, must be burned to produce 629 kJ of heat?
26.33
mass:
TOOLS
x10
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The accelerometer keeps track of how quickly the speed of your vehicle is changing. When your car hits another car—or wall or telephone pole or deer—the accelerometer triggers the circuit. The circuit then sends an electrical current through the heating element, which is kind of like the ones in your toaster, except it heats up a whole lot quicker. This ignites the charge which prompts a decomposition reaction that fills the deflated nylon airbag (packed in your steering column, dashboard or car door) at about 200 miles per hour. The whole process takes a mere 1/25 of a second. The bag itself has tiny holes that begin releasing the gas as soon as it’s filled. The goal is for the bag to be deflating by time your head hits it. That way it absorbs the impact, rather than your head bouncing back off the fully inflated airbag and causing you the sort of whiplash that could break your neck. Sometimes a puff of white powder comes out of the bag. That’s cornstarch or talcum powder to…
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Name (please print):
Fall 2022
Basic Laboratory Operations
Post Lab Questions
1.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates
quickly). If you first measure the mass and then several minutes later you measure the volume of the
liquid will the measured density be higher than the true value, lower than the true value, or the true
density of the liquid. [It helps to understand this problem with the density equation.]
2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates
quickly). If you first measure the volume and then several minutes later you measure the mass of the
liquid will the measured density be higher than the true value, lower than the true value, or the true
density of the liquid. [It helps to understand this problem with the density equation.]
3.) You're attempting to calculate the density of an alloy. The alloy is in the shape of a cylinder. If the
mass of the alloy is…
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-
CVICW T C
OnstaILS IT CTIOUIC Tg
When 0.540 g of biphenyl (C12 H10) undergoes combustion in a
bomb calorimeter, the temperature rises from 24.9 °C to 30.1 °C.
You may need to reference (Pages 379 - 381) Section 9.5 while
completing this problem.
Part A
Find AErxn for the combustion of biphenyl. The heat capacity of the bomb calorimeter, determined in a separate experiment, is 5.86 kJ/° C.
Express the energy in kilojoules per mole to three significant figures.
V ΑΣφ
kJ/mol
ΔΕΧ
rxn
Request Answer
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Mon Sep 28 3:13 PM
session.masteringchemistry.com
Test Chapter 5
Hide Timer
Item 16
16 of 20
v Complete
I Review I Constants I Periodic Table
A high-protein diet contains 63.6 g of carbohydrate, 5.9 g of fat,
and 140 g of protein.
TABLE 3.7 Typical Energy
Values for the Three Food
Турes
Part A
How much energy, in kilocalories, does this diet provide? (Round off the kilocalories to the tens place.)
Food Type
kcal/g
kJ/g
Express your answer to two significant figures and include the appropriate units.
Carbohydrate
4
17
Fat
9.
38
Protein
4
17
Submit
Previous Answers
Completed; correct answer withheld by instructor
Part B
How much energy, in kilojoules, does this diet provide? (Round off the kilojoules to the tens place.)
Express your answer to three significant figures and include the appropriate units.
Submit
Previous Answers
Completed; correct answer withheld by instructor
Provide Feedback
Next >
00
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Consider the following data for bromine:
atomic mass
79.904
mol
electronegativity
2.96
kJ
324.6
mol
electron affinity
kJ
1139.9
mol
ionization energy
kJ
5.8
mol
heat of fusion
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please answer
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The following table is the data table recorded in the lab for the reactions listed on in your VCL 3-12.
Parameter
Reaction 1
Reaction 2
Reaction 3
Mass NaOH
3.9982
3.9958
25.00
25.00
24.99
Initial temperature (°C)
30.05
36.05
30.84
Final temperature (°C)
Assuming the experiments are done exactly as describe in VCL 3-12, calculated the energy released, in
kJ/mol, of NaOH in each reaction. Show all calculation steps.
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11.How many liters of gas were produced?
12.How much heat was released?
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Consider the following data for iridium:
192.22
mol
atomic mass
electronegativity
2.20
kJ
151.0
mol
electron affinity
kJ
880.
mol
ionization energy
kJ
26.
mol
heat of fusion
You may find additional useful data in the ALEKS Data tab.
Does the following reaction absorb or release energy?
release
absorb
(1) r @) + e → Ir(<)
Ir (g)
Can't be decided with the data given.
yes
Is it possible to calculate the amount of energy absorbed
or released by reaction (1) using only the data above?
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Figure
40
Petroleum
30
Natural
gas
Coal
Nuclear
electric
power
Hydroelectric
power
Wood
1800
1825
1850
1875
1900
1925
1950
1975
2000
Year
Since 1800, the main sources of energy have been fossil fuels, with other sources contributing
less than 20% of the total.
Chapter 3, Question 49
Using information in the figure above, calculate the total world energy consumption in 1975.
i
x 10
i
kJ
eTextbook and Media
Save for Later
Attempts: 0 of 3 used
Submit Answer
Energy consuption by source, 1018 kJ/yr
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Consider the reaction below:
A + 2B → C
You carry out a reaction using .100 moles A and .150 moles of B in a calorimeter with
Ccal = 4.12 kJ/°C. Given the data below, what is the enthalpy of reaction in kJ/mol?
Temperature (°C)
26
25
24
23
22
-110
0
30
60
Time (s)
90
Check the sign of AH, make sure you scale by moles of reaction.
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D21 1120 Ch-13 Homework - General Chemistry II
W 1120 Ch-12 Homewart
Write a balanced chemical equation for each reaction. (Include states-of-matter under the given conditions in your answer.)
(a) combustion of acetylene (ethyne, C₂H₂(g)) to form carbon dioxide gas and water vapor
The reactants are acetylene and oxygen (because this is a combustion reaction) and the products are carbon dioxide gas and water. The
Help
chemPad
XX
(b) synthesis of NO(g) from N₂O(g) and NO₂(g)
The reactants are N₂O and NO2, and the product is NO. The balanced chemical equation is the following.
Help
chemPad
XX¹
chemPad
XX
Greek
←
->>
(c) reaction of solid carbon graphite with water vapor to produce carbon monoxide gas and hydrogen gas
The reactants are C and H₂O, and the products are CO and H₂. The balanced chemical equation is the following.
Greek
→ Help
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help please answer in text form with proper workings and explanation for each and every part and steps with concept and introduction no AI no copy paste remember answer must be in proper format with all working
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Material:
Block Mass:
Wood
5.0 g 10.0 g
Heating Duration:
3 s
I final
Heat
Reset
Tinitial
150 J has been transferred to the block.
20.0 °C
37.0 °C
Experiment Complete
Click Reset for a new experiment.
Set the simulation to the following parameters and run the experiment by clicking Heat.
Material: Copper
Heating Duration: 2.0 s
Block Mass: 5.0 g
What is the final temperature of the block?
°C
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Please type this, dont write it on a paper.
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3.
Circle the processes that are nonspontaneous
Climbing stairs
dissolving salt in water
Converting table salt (NaCl) to its elements
2 H2O(1) → 2 H2(g) + O2(g)
O Type here to search
12:20 AM
4/24/2021
80
D FIG H
GIRAK
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Core Chemistry Skill: Balancing a Chemical Equation
5 of 33
>
to form four moles of the product, water.
Part A
Balance the chemical equation by indicating the number of each species in the appropriate blanks. For this exercise, indicate coefficients of 1 explicitly.
Match the numbers in the left column to the appropriate blanks in the chemical equations on the right. Make certain the chemical equation is complete before submitting your answer.
• View Available Hint(s)
Reset
Help
1
Fe (s) +
H2O (1) →
Fe3 04 (s) +
2
Н2 (9)
3
4
Submit
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I've attached a picture of the problem. Please let me know if you need any more info. Thank you.
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1.
Progress of Reaction
Potential Energy Diagram Equation
+
Match each of the potential energy diagrams above with the equation below. Use each of the diagrams only once
+
2.
N₂(g) + 20₂(g) + 11.1 kJ → N₂O4(9)
N₂(g) + O₂(g) → 2NO(g)
0.0
Progress of Reaction
FeO (s) + CO(g) → CO₂(g) + Fe(s)
AH° +197 kJ
2CH3OH(1) + 30₂(g) → 2CO₂(g) + 4H₂O(g) + 1275.8 kJ
A,H° -11.0 kJ
3.
Ep
(kJ)
Progress of Reaction
Ep
Progress of Reaction
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C
+
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Question 23.e of 23
Consider the following reaction at 25 °C:
5 SO3(g) + 2 NH3(g) → 2 NO(g) + 5 SO₂(g) + 3 H₂O(g)
If AH = 42.4 kJ./mol and AS° = 562.3 J/mol-K, estimate the
temperature at which this reaction would be at equilibrium assuming
that enthalpy and entropy are independent of temperature.
hp
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- Sign in Week 15 Recitation Caleb Young Oklahoma - CHEM 1315 (Section 001) - Fall20 - ROCHER > Activities and Due Dates > Week 15 Recitation O Assignment Score: 50% Resources O Hint Check Answer Question 9 of 10 > When methanol, CH, OH, is burned in the presence of oxygen gas, O,, a large amount of heat energy is released. For this 2: reason, it is often used as a fuel in high performance racing cars. The combustion of methanol has the balanced, thermochemical equation CH,OH(g) + 0,(g) → CO,(g) + 2H,O(1) AH = –764 kJ How much methanol, in grams, must be burned to produce 629 kJ of heat? 26.33 mass: TOOLS x10 about us careers privacy policy terms of use contact us help 5:14 PM 12/11/2020 50arrow_forwardreading: The accelerometer keeps track of how quickly the speed of your vehicle is changing. When your car hits another car—or wall or telephone pole or deer—the accelerometer triggers the circuit. The circuit then sends an electrical current through the heating element, which is kind of like the ones in your toaster, except it heats up a whole lot quicker. This ignites the charge which prompts a decomposition reaction that fills the deflated nylon airbag (packed in your steering column, dashboard or car door) at about 200 miles per hour. The whole process takes a mere 1/25 of a second. The bag itself has tiny holes that begin releasing the gas as soon as it’s filled. The goal is for the bag to be deflating by time your head hits it. That way it absorbs the impact, rather than your head bouncing back off the fully inflated airbag and causing you the sort of whiplash that could break your neck. Sometimes a puff of white powder comes out of the bag. That’s cornstarch or talcum powder to…arrow_forwardName (please print): Fall 2022 Basic Laboratory Operations Post Lab Questions 1.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the mass and then several minutes later you measure the volume of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 3.) You're attempting to calculate the density of an alloy. The alloy is in the shape of a cylinder. If the mass of the alloy is…arrow_forward
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