Homework Answers
At equilibrium soil water potential is equal to cell water potential hence -1300 k pascal
Preasure potentail = soil water potential + solute water potentail + root cell water potential
= (-1300) + ( -1300) + (-212)
= -2812 kpas
UESTION 1 What would enhance water uptake by a plant cell? O decreasing the Ψ of...
UESTION 1 What would enhance water uptake by a plant cell? O decreasing the Ψ of the surrounding solution O increasing the pressure exerted by the cell wall ( the loss of solutes from the cell o increasing the Ψ of the cytoplasm O positive pressure on the surrounding solution QUESTION 2 The value for Ψ in root tissue was found to be- O be from the tissue into the sucrose solution O be from the sucrose solution into the...
A galvanic cell has an iron electrode in contact with 0.12 M FeSO4 and a copper...
A galvanic cell has an iron electrode in contact with 0.12 M FeSO4 and a copper electrode in contact with a CuSO4 solution. PartA f the measured cell potential at 25 °C is 0.64 V, what is the concentration of Cu+ in the Cus04 solution? Express your answer using two significant figures. 2+ Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining
Suppose that the root-mean-square velocity Us of water molecules (molecular mass is equal to 18.0 g/mol)...
Suppose that the root-mean-square velocity Us of water molecules (molecular mass is equal to 18.0 g/mol) in a flame is Feedback found to be 1170 m/s. What temperature does this represent? The root-mean-square velocity Urms of a molecule in a gas is related to 5.95 x109 temperature the mass of the molecule m and the temperature of the gas T. 3KT Urms The Boltzmann constant is k = 1.38 x 10-23 J/K.
1. A voltaic cell is constructed that is based on the following reaction: Sn2+(aq)+Pb(s)→Sn(s)+Pb2+(aq). A. If...
1. A voltaic cell is constructed that is based on the following reaction: Sn2+(aq)+Pb(s)→Sn(s)+Pb2+(aq). A. If the concentration of Sn2+ in the cathode compartment is 1.30 M and the cell generates an emf of 0.25 V , what is the concentration of Pb2+ in the anode compartment? B. If the anode compartment contains [SO2−4]= 1.30 M in equilibrium with PbSO4(s), what is the Ksp of PbSO4? 2. A voltaic cell utilizes the following reaction: 2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq). A. What is the emf...
Consider a galvanic cell where one compartment has Br2 (aq) at a concentration of 0.50 M and Br ̄ at a concentration of...
Consider a galvanic cell where one compartment has Br2 (aq) at a concentration of 0.50 M and Br ̄ at a concentration of 0.10 M with a platinum electrode and the second compartment has Cr3+ at a concentration of 0.20 M and a Cr electrode. Use the following reduction potentials to answer the questions: Cr3+ (aq) + e ̄→Cr(s) εo = - 0.73 V Br2(aq) + 2e ̄→2Br ̄ (aq) εo =1.09V a. What is the standard cell potential for...
Page 3 An electrochemical is prepared from a chromium metal electrode in contact solution of 0.500 M chromium (III)...
Page 3 An electrochemical is prepared from a chromium metal electrode in contact solution of 0.500 M chromium (III) nitrate and a standard hydrogen half-cell elect The two half cells are connected by a porous disk or a KCl salt bridge. Standard Reduction Potentials at 298 K Cr+ (aq) + 3e ----> Cr(s) Cr+ (aq) + e ----> Cr2+ (aq) E° = -0.740 V E° = -0.440 V a) Write the reaction for the cell and calculate the standard free...
Question 4 Steven incubated rhubarb epidermal peel cells in water with increasing concentrations of sucrose for...
Question 4 Steven incubated rhubarb epidermal peel cells in water with increasing concentrations of sucrose for a period of 1 h and observed the extent of plasmolysis under the microscope and recorded the data in following table. Using the results obtained and the formula provided, calculate the osmotic pressure the cell exerts on the walls. Table: Plasmolysis gradient results after 1h of incubation % cells plasmolysed Sucrose concentration Number of cells /25 plasmolysed 0 0.0 M Sucrose 0.10 M Sucrose...
The following oxidation/reduction reaction of copper and tin has an equilibrium constant equal to 1.48 at...
The following oxidation/reduction reaction of copper and tin has an equilibrium constant equal to 1.48 at 300 Kelvin. At this temperature the equilibrium concentrations are measured to be [Sn^2+]=0.124 M, [Cu+]=0.148 M and [Sn^4+]=0.176. Determine the equilibrium concentration of Cu^2+
The Nernst equation is one of the most important equations in electrochemistry. To calculate the cell...
The Nernst equation is one of the most important equations in electrochemistry. To calculate the cell potential at non-standard-state conditions, the equation is Part A E E- 2.303 RT logO For the reaction nF 2C03 (aq)2Ci (aq)+2C02+ (aq) Cl2 (g). E = 0.483 V where E is the potential in volts, E° is the standard potential in volts, R is the gas constant, T what is the cell potential at 25 °C if the concentrations are Co3+ M, and the...
Plant physiology questions To be completed and turned in next week: POST-LAB QUESTIONS: 1. If a...
Plant physiology questions
To be completed and turned in next week: POST-LAB QUESTIONS: 1. If a potato core is allowed to dehydrate by sitting in the open air, would the water potential of the potato cells decrease or increase? Why? 2. If a plant cell has a lower water potential than its surrounding environment and if pressure is equal to zero, is the cell hypertonic (Gn terms of solute concentration) or hypotonic to its environment? Will the cell gain or...
UESTION 1 What would enhance water uptake by a plant cell? O decreasing the Ψ of the surrounding solution O increasing the pressure exerted by the cell wall ( the loss of solutes from the cell o increasing the Ψ of the cytoplasm O positive pressure on the surrounding solution QUESTION 2 The value for Ψ in root tissue was found to be- O be from the tissue into the sucrose solution O be from the sucrose solution into the...
A galvanic cell has an iron electrode in contact with 0.12 M FeSO4 and a copper electrode in contact with a CuSO4 solution. PartA f the measured cell potential at 25 °C is 0.64 V, what is the concentration of Cu+ in the Cus04 solution? Express your answer using two significant figures. 2+ Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining
Suppose that the root-mean-square velocity Us of water molecules (molecular mass is equal to 18.0 g/mol) in a flame is Feedback found to be 1170 m/s. What temperature does this represent? The root-mean-square velocity Urms of a molecule in a gas is related to 5.95 x109 temperature the mass of the molecule m and the temperature of the gas T. 3KT Urms The Boltzmann constant is k = 1.38 x 10-23 J/K.
Page 3 An electrochemical is prepared from a chromium metal electrode in contact solution of 0.500 M chromium (III) nitrate and a standard hydrogen half-cell elect The two half cells are connected by a porous disk or a KCl salt bridge. Standard Reduction Potentials at 298 K Cr+ (aq) + 3e ----> Cr(s) Cr+ (aq) + e ----> Cr2+ (aq) E° = -0.740 V E° = -0.440 V a) Write the reaction for the cell and calculate the standard free...
Question 4 Steven incubated rhubarb epidermal peel cells in water with increasing concentrations of sucrose for a period of 1 h and observed the extent of plasmolysis under the microscope and recorded the data in following table. Using the results obtained and the formula provided, calculate the osmotic pressure the cell exerts on the walls. Table: Plasmolysis gradient results after 1h of incubation % cells plasmolysed Sucrose concentration Number of cells /25 plasmolysed 0 0.0 M Sucrose 0.10 M Sucrose...
The Nernst equation is one of the most important equations in electrochemistry. To calculate the cell potential at non-standard-state conditions, the equation is Part A E E- 2.303 RT logO For the reaction nF 2C03 (aq)2Ci (aq)+2C02+ (aq) Cl2 (g). E = 0.483 V where E is the potential in volts, E° is the standard potential in volts, R is the gas constant, T what is the cell potential at 25 °C if the concentrations are Co3+ M, and the...
Plant physiology questions
To be completed and turned in next week: POST-LAB QUESTIONS: 1. If a potato core is allowed to dehydrate by sitting in the open air, would the water potential of the potato cells decrease or increase? Why? 2. If a plant cell has a lower water potential than its surrounding environment and if pressure is equal to zero, is the cell hypertonic (Gn terms of solute concentration) or hypotonic to its environment? Will the cell gain or...
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