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—— » R B © *+ @ Speed of Sound_2-07-24 — Saved to my Mac v Draw Design Layout References Mailings Review Q Tell me DComments fEditing v AsNew.‘, vi13 viA A | Aav | A _E V:E__r i‘v T:L: 2= IQ/V [2 @ é Styles Styles Dictate Sensitlvity Editor A ¥ l q Pane OBJECTIVE (3 points): A The objective for this experiment is to determine the speed of sound waves in the air by : comparing measured values of speed to the theoretical value. This will be done by adjusting the level of eater in a tube and finding resonances for specific keyboard notes. Experimental Data (3 point): How many resonance do you find in E3? 336.2 +/- 32.96 m/s How many resonance do you find in B4? 296.3 +/- 98.78 m/s Data Analysis (10 points): Theoretical Speed of Sound I Room Temperature T = 20 °C (provided in the Simulation) } Theoretical speed of sound in air at temperature T: ¢ v, = (331.5 + 0.607T) Experimental Speed of Sound 1) Frequency 1 - note E3 fea= 164.81 Hz 2) The length of air column for the first resonance L= 0.38 +/-0.005 m 3) The length of air column for the second resonance L= 1.40 +/-0.005 m nd_2-07-24.docx”; 3,615 characters (an approximate value) e = = E3J Focus G =
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Use the References to access important values if needed for this question.
A sample of solid silver is heated with an electrical coil. If 30.4 Joules of energy are added to a 12.1
gram sample and the final temperature is 35.6 °C, what is the initial temperature of the silver?
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Question 1
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Question 2
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"Heater Meals" are food packages that contain their own heat source. Just pour water into the heater unit, wait a few minutes, and voilà! You have a hot meal.
Mg(s) + 2 H2O(l) → Mg(OH) 2 (s) + H2(g)
Question 3
1 pt
Species
AH° (kJ/mol) S° (J/mol·K) AƒG° (kJ/mol)
Question 4
2 pts
Mg(s)
0
32.67
0
Question 5
1 pt
Question 6
× 2 pts
H2O(l)
Mg(OH)2(s)
-285.83
69.95
-237.15
-924.54
63.18
-833.51
H2(g)
0
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Question 7
1 pt
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2 pts
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1 pt
HEATER MEALS
Question 10
2 pts
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1 pt
Question 13
Charles D. Winters
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HEATER MEALS
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Question 14
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The heat for the heater unit is produced by the reaction of magne-
sium with water.…
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8.52. Use the molar volume to calculate each of the following at STP:
a) the number of moles of CO, in 4.00 L of CO2 gas
b) the volume, in liters, occupied by 0.420 mole of He gas
c) the volume, in liters, occupied by 6.40 g of 02 gas
d) the number of grams of Ne contained in 11.2 L of Ne gas
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Molarity (M) of NaOH (from the bottle of NaOH): 0.204 mol/L
Titration Number
3
4
34.44
mL
0.50ML
Final Volume buret reading (mL NAOH)
34.00
33.85
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0.50mL
33.80
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0.50mL
0.50mL
Initial Volume buret reading (mL NaOH)
Volume NaOH used in titration (mL) =
Final Volume buret reading (mL NAOH) - mL
Initial Volume buret reading (mL NaOH)
33.94
For calculations multiply mL by 10-3 to
convert mL toL
Molarity (M or mol/L) NaOH
from the bottle of NaOH
0.204
mol/L
10.0 mL 10.0mL
0.204
0.204
0.204
mol/L
10.0 mL 10.0 mL
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Please answer the following questions fully and to the best of your ability
1) Please state how you would synthesize the following polymer below and show the mechanism behind
the reaction. Note that this also means you need to tell me which molecule you are starting with as well
as specifying all conditions required.
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OH
2) Will either the polymer or the monomers you used to make it show peaks if IR spectroscopy analysis
was done on them, and if so where? How about if UV-vis spectroscopy was performed instead?
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Can any of the following be used as primary standards:NaOH, H2SO4, HNO3?
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Ethanol (C₂H6O) burns in air
C₂H60) +O2(g) → CO2(g) + H₂O (1)
Balance the equation and determine the volume of air in liters at 35°C and 790 mm Hg required to burn 227 g of ethanol.
Assume that air is 21% O₂ by volume.
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1.0 x 1014[H3O+]× [OH ]
When the [OH ] is known, the [H3O+] can be calculated using the equation
User Settings
pH = - log [H3O+]
which is called the
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1.0 x 10 14
[H3O+] x [OH
After rearranging to solve for [H30+], this equation can then be substituted into the expression to
water neutralization expression
solve for pH, which is
to determine the pH of a solution from the given [OH ].
water equilibrium equation
pH = - log [OH]
1.0 x 107 = [H3o*]× [OH]
pH = log [H3O*]
water dissociation expression
pH = 0.5 log [H30*]
|1.0 x 10-7= [H3O*] × [OH¯]
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Learning Goal:
What is AHm for the following chemical reaction?
To understand how standard enthalpy of reaction is
related to the standard heats of formation of the
CO2 (g) + 2KOH(s)→H2O(g) +K2CO3 (s)
Pearson eText
reactants and products.
You can use the following table of standard heats of formation (AH:) to calculate the enthalpy of the
Study Area
The standard enthalpy of reaction is the enthalpy
change that occurs in a reaction when all the
reactants and products are in their standard states.
The symbol for the standard enthalpy of reaction is
AHn. where the subscript "rxn" stands for…
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