Thermite demo CER 2022 Prachi Patel
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CHM 11100
Activities and Explorations
Claim, Evidence, Reasoning
Thermite Demonstration due November 20 at 11:59 PM, worth 10 points
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Watch the Thermite reaction demonstration and answer the following questions.
1.
(1 pts) Casey claimed that the thermite reaction was an exothermic reaction, identify at
least 2 pieces of evidence from the video that support her claim (the reaction is
exothermic).
The reaction is exothermic because there was a lot of heat
and spark given off. The heat was going from the system to
the surroundings. The system lost energy through sparks.
2.
This is a rendering of the thermite reaction. Include
labels and a description for the following:
(1 pt) The system (Hint:
What is in the crucible, the
cup in the ring stand?),
The system is the Iron oxide, Aluminum, and
Potassium permanganate with the glycerin
(1 pt.) the surroundings, and
The surrounding is everything else including the crucible, the sand, the air in the
atmosphere, and the ring stand.
(1 pt.) draw an arrow or arrows to describe the flow of energy between system and
surroundings (which way does it flow, system to surroundings, or surroundings to
system?).
3.
(3 pts.) Write a balanced chemical equation for the thermite reaction showing all states
of reactants and products.
Assign oxidation numbers to all elements in the reactants
and products.
Fe
2
O
3
(s) + 2Al(s)
à
2 Fe(l) + Al
2
O
3
(s)
Fe=+3 so Fe
2
=+6 O=-2 so O
3
=-6 Al=0 Fe=0 Al=+3 so Al
2
=+6 O=-2 so O
3
=-6
4.
Write out reasoning for the following claim:
The thermite reaction is exothermic. (We are
giving you the claim!)
Reasoning: (3 pts) Assemble an argument by connecting your observations and evidence to the
claim to justify why the reaction is exothermic.
Explain your reasoning and use scientific
principles about heat flow that we have explored in class.
You must discuss the energy flows in
the reaction and what evidence you have for that energy exchange (you can use your picture
drawn in #2!).
The thermite is an exothermic reaction. It is an exothermic reaction because the light that was
given off during the reaction indicated that the heat was being released. If the heat is being
released it is going from the system to the surrounding. That’s the arrows are on two are going
to the surroundings from the system. In exothermic heat is given off and it goes from the system
to the surroundings; that is why this reaction is exothermic.
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Experiment 4: Preparation and Properties of Hydrogen and Oxygen Gases
Toriana Mieer -Jones
Name:
Section:
Lab Instructor:
L/26
Date:
Pre-Lab Exercise 4
1. In this experiment, simple chemical reactions are used to generate small quantities of hydrogen and
oxygen gases. These methods would be too expensive and too complicated if large quantities of these
gases were needed, however. Use your textbook, a chemical encyclopedia, or an online source to look
up the major industrial methods of preparing very large quantities of these gases. Summarize your
findings here.
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The K. for the following reaction is 15 at 220 °C. If an equilibrium mixture contains 0.40 M CO
and 0.20 M H2, what is the molar concentration of CH4O ?
CO (g) + 2H2 (g) CH,0(g)
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Be sure to answer all parts.A sample of natural gas contains 6.626 moles of methane (CH.), 1.335 moles
of ethane (C2H6), and 0.380 moles of propane (C3Hg). If the total pressure of the gases is 3.86 atm, what
are the partial pressures of the gases?
PCH, =
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atm
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You may want to reference (Pages 782 - 784)
Section 16.15 while completing this problem.
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a) Briefly describe two fundamental differences between the two theories. You could consider differences in
the models, the mathematics, or the results. "Brief description" means two to three sentences per
difference.
b) Briefly describe an advantage that valence bond theory has over molecular orbital theory.
c) Briefly describe an advantage that molecular orbital theory has over valence bond theory.
6) Use a Jablonski diagram or potential energy curves to show the theoretical difference between fluorescence and
phosphorescence. Describe how you determine the difference experimentally.
7)…
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a) Briefly describe two fundamental differences between the two theories. You could consider differences in
the models, the mathematics, or the results. "Brief description" means two to three sentences per
difference.
b) Briefly describe an advantage that valence bond theory has over molecular orbital theory.
c) Briefly describe an advantage that molecular orbital theory has over valence bond theory.
6) Use a Jablonski diagram or potential energy curves to show the theoretical difference between fluorescence and
phosphorescence. Describe how you determine the difference experimentally.
7)…
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Building Vocabulary
From the list below, choose the term that best completes each sentence.
matter
physical change
endothermic reaction
chemical change
chemistry
precipitate
exothermic reaction
7. Any change that alters a substance without changing it into another
substance is a(n)
8.
is anything that has mass and takes up space.
9. A reaction that releases energy in the form of heat is called a(n)
10. A(n)
absorbed.
11. A chemical reaction is also referred to as a(n)
is a reaction in which
energy
is
12. A(n)
a chemical reaction.
is a solid formed from a solution during
13.
is the study of the properties of matter and
how matter changes.
OPearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved…
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dearly identifying your answers. Use the Browse My Computer button to upload an image.
The following data was collected for the formation of N205. By reaction of NO2 and 0₂
4NO2 02 2N₂Os
Time in Mantes
10.0
20.0
30.0
40.0
50.0
60.0
70.0
10.0
90.0
100.0
[0₂] units of Molarity
0.0078
0.0077
0.0075
0.0072
0.0065
0.0063
0.0057
0.0048
0.0056
0.0021
0.0010
a. Show all your work, what is the average rate of the reaction?
b. Show all your work, what is the instantaneous rate from 10.0 to 40.0 minutes?
c. Show all your work, what is the instantaneous rate from 30.0 to 60.0 minutes?
d. Show all your work, what is the instantaneous rate from 50.0 to 90.0 minutes?
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..1.. 4..
. I6 Il 7
Scenario 2
The airbags in vehicles contain a mixture of NaN,, KNO, and SiO, When a car decelerates at a rapid
pace, an electrical signal goes to the gas generator inside the airbag, triggering a series of three
chemical reactions:
10NAN.
10NA +2KNỎ,
K,O + Na,0 + Na + SiO, - K,SiO,
10NA + 15N,(g)
KO + 5Na O + N,(g)
These reactions produce gas (N.) to fill the airbag and convert sodium azide (NaN,), a highly toxic
substance, to alkaline silicate (K,SiO ).
The quantity of NaN, must be carefully calculated to ensure that the volume of gas is adequate to fill
the airbag firmly enough to protect the passenger but not overfill and cause the bag to explode. A
standard airbag needs 67 L of N, (g) to properly inflate.
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Y-ray photons with a wavelength of 2.54x10-5 nm
Express the energy numerically in kilojoules per mole.
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Module 14 Discussion: Logarithmic Application A
Radiative Forcing
Radiative forcing, R, measures the influence of carbon dioxide in altering the additional solar ration trapped in Earth's atmosphere. The
International Panel on Climate Change (IPCC) in 1990 estimated k to be 6.3 in the radiative forcing equation R = k In(), where Co is the
preindustrial amount of carbon dioxide and C is the current level. (Data from Clime, W., The Economics of Global Warming, Institute for
International Economics, Washington, D.C.)
(a) Use the equation R = 6.3 In() to determine the radiative forcing R, in watts per square meter (W) to the nearest tenth, expected by
the IPCC if the carbon dioxide level in the atmosphere doubles from its preindustrial level.
(b) Determine the global temperature increase T, in degrees Fahrenheit to the nearest tenth, that the IPCC predicted would occur if
atmospheric carbon dioxide levels were to double, given T(R) = 1.03R.
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Module 1: You have been linked to a
version of you where you have
hotdogs for fingers, fearing that Jobu
Topaki is coming for your life you need
to get back, and in order to get back
you need to supply a specific amount
of electricity to your pinky toe with a
battery from a barbie playhouse.
However the conversions are different
here, supplied with the knowledge
from Alphaverse Waymond figure out
how much energy is needed to supply
12 eV to your pinky toe. How much
haays is needed? (1eV=1.6x10^-19 J; 1 J
= 5 aken; 1 aken = 30 haays)
O2.88 x 10^-16 haays
O 1.125 x 10^22 haays
O 4.5 x 10^20 haays
5.0 x 1017 haays
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Chapter 2 An Introduction to the Chemistry of Life
37
SELF-QUIZ: TESTING YOUR KNOWLEDGE
1. Each atom has a nucleus made up of
р. 24.
2. In atoms, the number of protons is usually equal to the number
of
3. The atomic number of an atom is equal to the number of
7. Proteins and carbohydrates consist primarily of carbon,
hydrogen, and oxygen; these two molecules are types of
and neutrons.
-compounds. p. 31.
8. On the pH scale, a pH of is neutral; a solution with a pH
less than this is
this is
9. Chemicals like bicarbonate that resist pH change are called
р. 25.
and a solution with a pH greater than
р. 32,
in the nucleus. p. 26.
4 An alternative form of an atom is called an
differs in the number of neutrons in the nucleus. p. 26.
5. A bond formed between two atoms that share electrons is called
it
p. 33.
10. When water molecules dissociate, they form and
ions. p. 32.
bond. p. 28.
bonds form between oppositely charged atoms of
a(n)
polar covalent bonds of…
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Determine AH
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- For this question you will need to work all of your answers on scratch paper. Once completed, upload an image of your answers showing all work and dearly identifying your answers. Use the Browse My Computer button to upload an image. The following data was collected for the formation of N205. By reaction of NO2 and 0₂ 4NO2 02 2N₂Os Time in Mantes 10.0 20.0 30.0 40.0 50.0 60.0 70.0 10.0 90.0 100.0 [0₂] units of Molarity 0.0078 0.0077 0.0075 0.0072 0.0065 0.0063 0.0057 0.0048 0.0056 0.0021 0.0010 a. Show all your work, what is the average rate of the reaction? b. Show all your work, what is the instantaneous rate from 10.0 to 40.0 minutes? c. Show all your work, what is the instantaneous rate from 30.0 to 60.0 minutes? d. Show all your work, what is the instantaneous rate from 50.0 to 90.0 minutes?arrow_forward..1.. 4.. . I6 Il 7 Scenario 2 The airbags in vehicles contain a mixture of NaN,, KNO, and SiO, When a car decelerates at a rapid pace, an electrical signal goes to the gas generator inside the airbag, triggering a series of three chemical reactions: 10NAN. 10NA +2KNỎ, K,O + Na,0 + Na + SiO, - K,SiO, 10NA + 15N,(g) KO + 5Na O + N,(g) These reactions produce gas (N.) to fill the airbag and convert sodium azide (NaN,), a highly toxic substance, to alkaline silicate (K,SiO ). The quantity of NaN, must be carefully calculated to ensure that the volume of gas is adequate to fill the airbag firmly enough to protect the passenger but not overfill and cause the bag to explode. A standard airbag needs 67 L of N, (g) to properly inflate. notesarrow_forwardNonearrow_forward
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