Part A
A volume of 105 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.00 ∘C , what is the mass of the steel bar?
Use the following values:
specific heat of water = 4.18 J/(g⋅∘C)
specific heat of steel = 0.452 J/(g⋅∘C)
| please show work |
Part B
The specific heat of water is 4.18 J/(g⋅∘C). Calculate the molar heat capacity of water?
In: Chemistry
What is the molarity of a solution of s2o32- if 58 ml were required to titrate 42 ml of a 0.2M solution of IO3-
In: Chemistry
A) Does the pH increase, decrease or remain the same on the addition of the of the following?
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B) Which of the following (select all that apply) gives a buffer solution when equal volumes of the two solutions are mixed?
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0.10 M HF and 0.10 M NaF |
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0.10 M HF and 0.10 M NaOH |
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0.50 M HF and 0.25 M NaOH |
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0.25 M HCl and 0.50 M NaF |
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Fluoride Selective Ion Electrode. Describe how a fluoride selective ion electrode measures the fluoride ion concentration and explain why the potential approaches 0 at high concentrations
In: Chemistry
In: Chemistry
7. Given the standard reduction potential for the following two half-cell reactions (in the presence of 1.00 M HCl):
Fe3+ + e <==> Fe2+, E0 = + 0.68 V
AsO4 - + 2H+ + 2e <==> AsO3 - + H2O, Eo = +0.559 V.
Please calculate the system potential at the equivalence point when Fe3+ was used to titrate AsO3 - in the presence of 1.00 M HCl.
Answer: 0.60 V
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5. For the titration of 50.00 mL of 0.0500 M Ce4+ with 0.1000 M Fe2+ in the presence of 1 M H2SO4, please calculate the system potential while 3.00 mL of Fe2+ is added.
Ce4+ + e <==> Ce3+, E0 = + 1.44 V (in 1 M H2SO4)
Fe3+ + e <==> Fe2+, E0 = + 0.68 V (in 1 M H2SO4).
Answer is 1.49 V
5b) In the above titration, what's the electrode potential after 28.90 mL of Fe2+ is added?
Answer is 0.73 V.
Just wondering, how they got that?
In: Chemistry
1,All of the following are true concerning nuclear fission except
a) Uranium is typically split into smaller atoms
b) Nuclear reactors are used to make electricity
c) The energy involved can be calculated using E = mc2
d) The reaction involved is called a thermonuclear reaction
e) During fission there is a change in mass called the mass defect
2,
All of the following are true concerning nuclear fusion except
| a)Typically hydrogen is fused together to form helium | |
| b) The amount of hydrogen needed to achieve this is called the critical mass | |
| c) At this time there have been no economically successful fusion reactors created | |
| d )Fusion requires extremely high temperatures | |
| e) Nuclear fusion is the process that powers the sun |
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Which of the following salts would be more soluble in acid solution than in pure water?
PbBr2
AgNO3
SrCl2
AgI
Please provide a thorough explanation as I was absent during this lecture... Thank you!!
In: Chemistry
Name the complex ion [Cu(NH3)2(H2O)4]2+. The oxidation number of copper is +2.
In: Chemistry
Phenolphthalein was the indicator you used in your titration.
a. What made phenolphthalein a good choice of indicator? (Meaning, how do you choose an appropriate indicator for a titration.)
b.You used only a couple drops of a 1% solution. Why is it important to use such a small quantity of indicator in a titration?
c.The point where the color changed is known as the end point. What is the difference between the end point and equivalence point?
d.Can the end point be used quantitatively? Why or why not?
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At T=Tc, (∂P/∂V)V T=Tc = 0 and (∂2P/∂V2)T=TC = 0. Use this information to derive expressions for a and b in the van der Waals equation of state in terms of experimentally determined Pc and Tc.
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A chemical process stream enters a shell-and-tube exchanger at a temperature of 200 °F and does two passes on the shell side, exiting the exchanger at 170 °F. For this particulate scenario, the heat exchanger has 200 stainless steel tubes that are 2-in. OD and 10 ft long. Indicate whether the temperature of the process stream will increase, decrease, or remain the same under the following scenarios. Justify your answer. a) The flow rate of the cooling fluid is increased. b) There are 100 tubes that are 1.5-in. OD and 26.6 ft long. c) The number of shell passes is doubled. d) The tube material is changed to copper.
In: Chemistry
1. Ka for hydrocyanic acid, HCN, is 4.00×10-10. Ka for acetylsalicylic acid (aspirin), HC9H7O4, is 3.00×10-4. Ka for phenol (a weak acid), C6H5OH, is 1.00×10-10
| What is the formula for the strongest acid? |
2. Ka for nitrous acid, HNO2, is 4.50×10-4. Ka for hydrocyanic acid, HCN, is 4.00×10-10. Ka for phenol (a weak acid), C6H5OH, is 1.00×10-10.
| What is the formula for the strongest conjugate base? |
3. The compound ammonia , NH3, is a weak base when dissolved in water. Write the Kb expression for the weak base equilibrium that occurs in an aqueous solution of ammonia :
4. Write the Ka expression for an aqueous solution of acetic acid , CH3COOH :
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2. Outline essential structural features a 1,4-Dihydropyridine must possess for effective Ca2+ channel blocking capability. Why are dimethyl 1,4-Dihydro-2,6-Dimethylpyridine-3,5-Dicarboxylate and diethyl 1,4-Dihydro-2,6-Dimethylpyridine-3,5-Dicarboxylate ineffective in this regard?
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