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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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6
v=1720 cm-1
v = 1150 cm 1
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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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"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
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H2O(l)
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The heat for the heater unit is produced by the reaction of magne-
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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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mol/L…
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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.
он
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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1.0 x 1014[H3O+]× [OH ]
When the [OH ] is known, the [H3O+] can be calculated using the equation
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which is called the
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[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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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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the partial pressures of each gas are 55.0 atm oxygen, 90.0 atm
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They mix: 40 mL of 10.0M HNO3 75mL KOH 1.20M 10mL
NaCl 0.450M Kw or= 1.00 x 10-14 Assuming that the volumes
are additive, determine: a) the initial mmoles of HNO3, KOH
and NaCl. b) the mmoles of HNO3 left over after the acid-
reaction is complete. base. c) the pH, pOH and pCl of the
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is complete. e) the non-thermodynamic Kw constant (assume
DHLL)
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9) In the reversible reaction Fe 3+ (ag) + SCN (ag) E → FESCN2+ (aq), the reactants are yellowish and the
product is red.
Why are iron (III) nitrate and potassium thiocyanate used to create this reaction mixture?
a) iron and thiocyanate are spectator ions
b) iron and thiocyanate are colorless
c) nitrate and potassium are spectator ions
d) nitrate and potassium are purple
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Can any of the following be used as primary standards:NaOH, H2SO4, HNO3?
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7) In the reversible reaction 2CrO,? (aq) + 2H* (aq) E→Cr,0;² (ag) + H2O (I), chromium (VI) oxide (the
reactant) is yellow and dichromate (the product) is orange.
What will happen when you add concentrated HCI (aq) to the reaction mixture?
a) The reaction mixture will become more yellow because increasing pH will shift the
equilibrium to the left.
b) The reaction mixture will become more yellow because decreasing pH will shift the
equilibrium to the left.
c) The reaction mixture will become more orange because increasing pH will shift the
equilibrium to the right.
d) The reaction mixture will become more orange because decreasing pH will shift the
equilibrium to the right.
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13. What were the 4 ancient elements that Empedocles described?
14. List the six ideas of John Dalton's model of the atom
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Company X was involved in developing materials to improve the properties of existing alloys and design
new alloys. As a material science engineer in the R&D department, your boss asks you to identify which
elements in Table 1 will make a complete solubility and interstitial solid solution with copper. You need
to present the result to the board of directors during the next meeting. Hence, prepare a short report and
justify your answer to support your choice.
Atomic
Radius
Crystal
Structure negativity Valence
Electro-
Element
(пт)
Cu
0.1278
FCC
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+2
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3-21 Complete this table for H₂O:
T, °C
220
190
P, kPa
400
2500
4000
u, kJ/kg
1450
3040
Phase description
Saturated vapor
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8) In the reversible reaction [Co(H,O)6]²*(aq) + 4CI (aq) +→[Co(H,O),Cl4]² (aq) + 4H,O(1), the initial color
of the reaction mixture was pink.
When concentrated HCI (aq) was added to the reaction mixture, the color changed to purple.
Which reactant is purple and why?
a) [Co(H2O)6]²*(aq) is purple because it is a cobalt compound
b) [Co(H2O)6]²*(ag) is purple because adding Cl (as HCI) shifted the reaction towards
products
c) HCl is purple because adding it turned the reaction purple
d) [Co(H2O),ClĄ]? (aq) is purple because adding CI (as HCI) shifted the reaction towards
products
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Calculate the molarity of a solution containing 217 grams of NaCl in 747 ml of solution? (Atomic masses of Na=23 and Cl=35.5)
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Sy derivative of x^{7cos( X
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Standard Enthalpy of Reaction
Item 4
Syllabus
II Review | Constants | Periodic Table
Scores
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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