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20 Nov
2020

which solvent (Distilled water, 0.5%NaCl, 02%NaCl, and 70% Isoprophy alcohol) provided the best separation?…

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which solvent (Distilled water, 0.5%NaCl, 02%NaCl, and 70% Isoprophy alcohol) provided the best separation? 2.Explain which characteristics of the solvent were used to effectively separate the analytes.3.Some children have reactions to yellow 5 or yellow 6 dye. Yellow 5 is a pale-yellow color and yellow 6 is more orange. Use the colors seen on the chromatograms to determine which m
1) A flask contains 250.0 g water at 20.00 °a. what is the temperature change C. If you add 5.000
1) A flask contains 250.0 g water at 20.00 °a. what is the temperature change C. If you add 5.000 g ice to the flask and let the solution reach equilibrium … of the water?b. what is the final temperature of the water?c. is there any ice left floating in the water?c for water is 4.184 J/g.°C.The energy required to melt ice = 333.6 J/gThis means it takes 333.6 J to melt 1.0 g ice
Consider an exothermicThe value of q for the system is negative process taking place in an Erlenmeyer flask at room
Consider an exothermicThe value of q for the system is negative process taking place in an Erlenmeyer flask at room temperature, determine if the following statement is true or false, then provide an explanation for your answer..Elaborate upon this in the explanations:Provide a definition of work and its relationship to enthalpy.The meanings of endothermic and exothermic.Defining a system and/or the surroundings.
Below is a generic equation for a reaction. If I mix 2 units of A, with 6 units of B,
Below is a generic equation for a reaction. If I mix 2 units of A, with 6 units of B, which of the following is true?2A 3B → C 3DA. Not enough information givenB. Substance B will be the limiting reactant.C. Substance A will be the limiting reactant.D. Both reactants will fully react.E. There would be no reaction.
The nuclear reaction shown below is an example of what type of process? A) fusion B) fission C) translation D)
Chemistry Assignment Writing ServiceThe nuclear reaction shown below is an example of what type of process? A) fusion B) fission C) translation D) alpha emission E) beta emission 2. Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of to the number of moles of produced? 4 Fe 3 O2 → 2 Fe2O3 A) B) C) D) E) 3. How many moles of C6H12O6 are in 90g C6H12O6? A) 0.50 moles B) 2.0 moles C) 6.0 moles D) 12 moles 4. What is the molar mass of magnesium hydroxide (Mg(OH)2) ? A) 58 g/mol B) 56 g/mol C) 42 g/mol D) 41 g/mol5. The combustion of ethanol with oxygen forms carbon dioxide and water. ___CH4(g) ___O2(g) → ___CO2(g) ___H2O(l) When this reaction is balanced, the coefficients in order are: A) 1, 2, 3, 3 B) 3, 3, 2, 1 C) 1, 2, 1, 2 D) 1, 3, 3, 26. Lead reacts with oxygen present in the air to form lead(IV) oxide. Pb(s) O2(g) PbO2(s) This reaction is classify as which following reaction: A) combination B) combustion C) decomposition D) double replacement7. What substance is being oxidized in this single-replacement reaction? Zn(s) 2 Ag 1(aq) Zn 2(aq) 2 Ag(s) A) Zn B) Zn 2 C) Ag D) Ag 1 8. How many moles of water (H2O) are needed to react with 2.5 moles of sodium? 2 Na H2O → Na2O H2 A. 1 mole B. 2 moles C. 6 moles D. 10 moles E. 1.25 moles9. How many grams of hydrogen (H2) are produced with 36.0 g of H­2O react? 2 Na H2O → Na2O H2 A. 4 grams B. 2 grams C. 1 gram D. 36 grams10. Which of the following is not part of the kinetic theory of gases? (Hint: go over your text book 256) A) A gas is composed of very small particles. B) There is very little empty space in a gas. C) Gas particles move rapidly. D) Gas particles do not attract or repel one another. E) Gas particles move faster when the temperature increases.11. The unit of 1 atmosphere used to describe the pressure of a gas is equal to ________. (Hint: go over text book page 258) A) 1 mmHg B) 100 mmHg C) 200 mmHg D) 600 mmHg E) 760 mmHg12. In Gay-Lussac’s law, the pressure of a gas increases due to an increase in temperature because ________. A) the molecules strike the walls of the container less often B) the molecules strike the walls of the container more often C) the molecules get bigger D) there is a decrease in the volume of the container E) there is an increase in the number of gas particles13. “The nitrogen bends” is caused by decreasing pressure too quickly after a period of increased pressure (such as ascending too quickly after a dive). It gets its name from the fact that nitrogen bubbles may form in or near the joints, causing pain and causing the diver to “bend over.” At a depth of 50. ft the initial pressure is 3.00 atm and the nitrogenbubble has a intimal volume of 0.019 ml. What will be the volume of the bubble at the sea level, where the pressure is 1.00 atm (change pressure)? A) 0.054 mL B) 3.0 mL C) 6.0 mL D) 18 mL14. A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank in the summer?(K = oC 273) A) 0.625 atm B) 4.44 atm C) 5.63 atm D) 40.0 atm E) 69.5 atm15. 1 mole of a gas occupies 22.4 L at ________. (Hint: STP ) A) 0 °C and 0.50 atm B) 0 °C and 760 mmHg C) 100 °C and 1 atm D) 100 °C and 10 atm E) 0 K and 1 atm16. A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 torr and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr? (1.0 atm = 760 torr) A) 330 torr B) 430 torr C) 760 torr D) 1.4 torr E) 1100 torr1.When nigrogen-14, , is bombarded with helium-4 (alpha particle), , a proton and one other particle are produced. What is the other particle? → ? A) B) C) D) 2. The nuclear reaction shown below is an example of what type of process? A) fusion B) fission C) translation D) alpha emission E) beta emission 3. Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of to the number of moles of produced? 4 Fe 3 O2 → 2 Fe2O3 A) B) C) D) E) 4. How many moles of C6H12O6 are in 90g C6H12O6? A) 0.50 moles B) 2.0 moles C) 6.0 moles D) 12 moles 5. What is the molar mass of magnesium hydroxide (Mg(OH)2) ? A) 58 g/mol B) 56 g/mol C) 42 g/mol D) 41 g/mol6. The combustion of ethanol with oxygen forms carbon dioxide and water. ___CH4(g) ___O2(g) → ___CO2(g) ___H2O(l) When this reaction is balanced, the coefficients in order are: A) 1, 2, 3, 3 B) 3, 3, 2, 1 C) 1, 2, 1, 2 D) 1, 3, 3, 27. Lead reacts with oxygen present in the air to form lead(IV) oxide. Pb(s) O2(g) PbO2(s) This reaction is classify as which following reaction: A) combination B) combustion C) decomposition D) double replacement8. What substance is being oxidized in this single-replacement reaction? Zn(s) 2 Ag 1(aq) Zn 2(aq) 2 Ag(s) A) Zn B) Zn 2 C) Ag D) Ag 1 9. How many moles of water (H2O) are needed to react with 2.5 moles of sodium? 2 Na H2O → Na2O H2 A. 1 mole B. 2 moles C. 6 moles D. 10 moles E. 1.25 moles10. How many grams of hydrogen (H2) are produced with 36.0 g of H­2O react? 2 Na H2O → Na2O H2 A. 4 grams B. 2 grams C. 1 gram D. 36 grams11. Which of the following is not part of the kinetic theory of gases? (Hint: go over your text book 256) A) A gas is composed of very small particles. B) There is very little empty space in a gas. C) Gas particles move rapidly. D) Gas particles do not attract or repel one another. E) Gas particles move faster when the temperature increases.12. The unit of 1 atmosphere used to describe the pressure of a gas is equal to ________. (Hint: go over text book page 258) A) 1 mmHg B) 100 mmHg C) 200 mmHg D) 600 mmHg E) 760 mmHg13. In Gay-Lussac’s law, the pressure of a gas increases due to an increase in temperature because ________. A) the molecules strike the walls of the container less often B) the molecules strike the walls of the container more often C) the molecules get bigger D) there is a decrease in the volume of the container E) there is an increase in the number of gas particles14. “The nitrogen bends” is caused by decreasing pressure too quickly after a period of increased pressure (such as ascending too quickly after a dive). It gets its name from the fact that nitrogen bubbles may form in or near the joints, causing pain and causing the diver to “bend over.” At a depth of 50. ft the initial pressure is 3.00 atm and the nitrogenbubble has a intimal volume of 0.019 ml. What will be the volume of the bubble at the sea level, where the pressure is 1.00 atm (change pressure)? A) 0.054 mL B) 3.0 mL C) 6.0 mL D) 18 mL15. A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank in the summer?(K = oC 273) A) 0.625 atm B) 4.44 atm C) 5.63 atm D) 40.0 atm E) 69.5 atm16. 1 mole of a gas occupies 22.4 L at ________. (Hint: STP ) A) 0 °C and 0.50 atm B) 0 °C and 760 mmHg C) 100 °C and 1 atm D) 100 °C and 10 atm E) 0 K and 1 atm17. A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 torr and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr? (1.0 atm = 760 torr) A) 330 torr B) 430 torr C) 760 torr D) 1.4 torr E) 1100 torr1.When nigrogen-14, , is bombarded with helium-4 (alpha particle), , a proton and one other particle are produced. What is the other particle? → ? A) B) C) D) 2. The nuclear reaction shown below is an example of what type of process? A) fusion B) fission C) translation D) alpha emission E) beta emission 3. Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of to the number of moles of produced? 4 Fe 3 O2 → 2 Fe2O3 A) B) C) D) E) 4. How many moles of C6H12O6 are in 90g C6H12O6? A) 0.50 moles B) 2.0 moles C) 6.0 moles D) 12 moles 5. What is the molar mass of magnesium hydroxide (Mg(OH)2) ? A) 58 g/mol B) 56 g/mol C) 42 g/mol D) 41 g/mol6. The combustion of ethanol with oxygen forms carbon dioxide and water. ___CH4(g) ___O2(g) → ___CO2(g) ___H2O(l) When this reaction is balanced, the coefficients in order are: A) 1, 2, 3, 3 B) 3, 3, 2, 1 C) 1, 2, 1, 2 D) 1, 3, 3, 27. Lead reacts with oxygen present in the air to form lead(IV) oxide. Pb(s) O2(g) PbO2(s) This reaction is classify as which following reaction: A) combination B) combustion C) decomposition D) double replacement8. What substance is being oxidized in this single-replacement reaction? Zn(s) 2 Ag 1(aq) Zn 2(aq) 2 Ag(s) A) Zn B) Zn 2 C) Ag D) Ag 1 9. How many moles of water (H2O) are needed to react with 2.5 moles of sodium? 2 Na H2O → Na2O H2 A. 1 mole B. 2 moles C. 6 moles D. 10 moles E. 1.25 moles10. How many grams of hydrogen (H2) are produced with 36.0 g of H­2O react? 2 Na H2O → Na2O H2 A. 4 grams B. 2 grams C. 1 gram D. 36 grams11. Which of the following is not part of the kinetic theory of gases? (Hint: go over your text book 256) A) A gas is composed of very small particles. B) There is very little empty space in a gas. C) Gas particles move rapidly. D) Gas particles do not attract or repel one another. E) Gas particles move faster when the temperature increases.12. The unit of 1 atmosphere used to describe the pressure of a gas is equal to ________. (Hint: go over text book page 258) A) 1 mmHg B) 100 mmHg C) 200 mmHg D) 600 mmHg E) 760 mmHg13. In Gay-Lussac’s law, the pressure of a gas increases due to an increase in temperature because ________. A) the molecules strike the walls of the container less often B) the molecules strike the walls of the container more often C) the molecules get bigger D) there is a decrease in the volume of the container E) there is an increase in the number of gas particles14. “The nitrogen bends” is caused by decreasing pressure too quickly after a period of increased pressure (such as ascending too quickly after a dive). It gets its name from the fact that nitrogen bubbles may form in or near the joints, causing pain and causing the diver to “bend over.” At a depth of 50. ft the initial pressure is 3.00 atm and the nitrogenbubble has a intimal volume of 0.019 ml. What will be the volume of the bubble at the sea level, where the pressure is 1.00 atm (change pressure)? A) 0.054 mL B) 3.0 mL C) 6.0 mL D) 18 mL15. A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0 °C. During the summer, the temperature in the storage area reached 40.0 °C. What was the pressure in the gas tank in the summer?(K = oC 273) A) 0.625 atm B) 4.44 atm C) 5.63 atm D) 40.0 atm E) 69.5 atm16. 1 mole of a gas occupies 22.4 L at ________. (Hint: STP ) A) 0 °C and 0.50 atm B) 0 °C and 760 mmHg C) 100 °C and 1 atm D) 100 °C and 10 atm E) 0 K and 1 atm17. A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 330 torr and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the mixture in torr? (1.0 atm = 760 torr) A) 330 torr B) 430 torr C) 760 torr D) 1.4 torr E) 1100 torr
On your first day working in a research lab, you are asked to make a pH= 3.5 buffer solution. You
On your first day working in a research lab, you are asked to make a pH= 3.5 buffer solution. You have only 5 different species available to use in the lab: HCl, NaOH, and the following three molecules: H2PO4- (pKb = 11.88) H3PO4 (pKa = 2.12) HCOOH (pKa = 3.75) a) Specify which two species you would add to water to prepare the buffer (write the molecular formulae of both species). b) What approximate ratio of moles of the species you chose in part (a) would you use to prepare the buffer?
Write the equation for Beer’s Law, and explain what each term stands for in thatequation. Given the following data and
Write the equation for Beer’s Law, and explain what each term stands for in thatequation. Given the following data and graph, calculate the concentration of the unknown.You must use the graph/equation of the line to calculate the unknown.Concentration Absorbance at 425 nm25 % Tartrazine 0.3850 % Tartrazine 0.7975 % Tartrazine 1.15100 % Tartrazine 1.62unknown0.95
Find the ΔpH/ΔV values and the average volume values with the data below. mL 0 0.5 1 1.5 2 2.5
Find the ΔpH/ΔV values and the average volume values with the data below. mL 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 17.5 18pH 2.64 2.72 3.22 3.38 3.43 3.59 3.78 3.82 3.96 4.05 4.14. 4.17 4.27 4.32 4.39 4.44 4.56 4.63 4.69 4.76 4.94 5.07 5.54 5.87 5.96 8.32 8.74 10.13 11.09 11.65 11.78 11.89 11.93 12.03 12.17 12.22 12.29
A 40.00 mL sample of 0.1000 M diprotic malonic acid is titrated with 0.0900 M KOH. What volume KOH must
A 40.00 mL sample of 0.1000 M diprotic malonic acid is titrated with 0.0900 M KOH. What volume KOH must be added to give a pH of 5.697?Ka1 = 1.42 × 10−3 and Ka2 = 2.01 × 10−6.A. Va = 66.67 mLB. Va = 44.44 mLC. Va = 22.22 mLD. Va = 88.89 mLE. Va = 111.11 mL
Complete Data and Calculations Sections of the Experiment and show your calculations inside the boxes. Part 1: Dilution of the
Complete Data and Calculations Sections of the Experiment and show your calculations inside the boxes. Part 1: Dilution of the 1.0 M NaOH Solution Data and CalculationsWhat is the concentration (mol/L or M) of a new NaOH solution prepared by diluting 25.0 mL of 1.0 M NaOH solution up to the total volume of 250.0 mL?Concentration of the new NaOH solution (M): (1.0M x 25.0mL) = C2(250.0mL) → 25 = C2(250.0mL) → 25 / 250 = 0.1 = C2 → C2 = (C1 x V1) / V2 → 0.1M = (1.0M x 25.0mL) / 250.0mL _____________Hint: C1V1 = C2V2 Part 2: Standardization of the NaOH SolutionResultsMass of dried KHC8H4O4 used to prepare the 250.0 mL of the acid solution : 4.175 gTitration/Trial Trial 1Trial 2Trial 3initial buret volume reading (mL):0.0020.000.00final buret volume reading (mL):19.7039.2519.10Data and CalculationsConcentration of the KHC8H4O4 solution (M) used in the experiment: ___________________Hint: C = n/V Molar mass of KHC6H4(CO2)2 = 204.22 g/mol204.22g / 0.25L = 816.88 M Titration/Trial Trial 1Trial 2Trial 3Volume of NaOH dispensed (mL): ___________________________________________Average volume of NaOH solution (mL) needed to titrate with 25.00 mL of KHC6H4(CO2)2_________________________Concentration of NaOH solution (M): ______________

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