Answer: True. Voltaic cells, also known as galvanic cells, are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow spontaneously. Redox reactions involve the transfer of electrons from one species to another, and the flow of electrons through a circuit can be used to do work, such as powering an electric motor or a lightbulb. The potential difference between the two half-cells in a voltaic cell is called the cell potential, and it determines the direction and magnitude of the flow of electrons.
Explanation:
the equilibrium constant of a redox reaction can be calculated from the standard reduction potentials of involved redox couples at given temperature.
The Nernst equation and the link between the standard cell potential and free energy can be used to determine the equilibrium constant of the redox process in an electrochemical cell.
The ratio of the product concentration to the reactant concentration is the equilibrium constant. a fixed value for a certain reaction at a specific temperature. The letter "c" denotes the expression of the equilibrium constant in terms of concentrations.
The standard cell potential, temperature, reaction quotient, and the cell potential of an electrochemical cell are all related by the Nernst equation. The Nernst equation can be used to determine the cell potentials of electrochemical cells even under unusual circumstances.
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High-purity benzoic acid (C6H₂COOH; AHxn for combustion = -3227 kJ/mol) is used as a standard
for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity = 1365 J/°C)
that contains exactly 1.240 kg of water. What temperature change is observed?
°℃
According to the given statement 5 °C temperature change is observed.
How does a calorimeter function and what is it?The variation in heat is measured by a calorimeter. A metal water container placed above an exhaust gases serves as the basic component of a calorimeter. The amount of water's temperature change is measured using a thermometer.
Briefing:The calorimeter burns a 1.221g sample.
The calorimeter contains 1.240 kg of water .
The calorimeter has a heat capacity of 1365 j/°C.
∆H rxn = -3227 kj/mol of benzoic acid
Given: 1.221 g is the mass of the benzoic acid
Benzoic acid's molecular weight is 122.12 g/mol.
122.12 g benzoic acid = 1 mol
1.221 g benzoic acid =1.221/122.12= 0.0099 moles
When burned, 1 mol of benzoic acid releases 3227 kj of energy.
Burning 0.0099 moles of benzoic acid produces energy
= 3227kj×(0.0099mols)/1 mol =32.2647 kj =32264.7 j
The calorimeter absorbed thermal energy
= 1365 j/C ×T
Water absorbs heat
= m× C× T
= 1240 g( 4.18 j/gC ) ×T
= 5183.2j/C×T
the total amount of heat absorbed
= 1365T + 5183.2T
=6548.2T
6548.2T=32264.7
T= 4.92 deg.C
T= 5 °C
The result is a 5 °C temperature change.
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Which if these options best describes the diagnostic cleavage that is typical of the mica group of minerals (which includes muscovite and bietet A) Three perpendicular cleavage planes B) Two cleavage planes intersecting at 90° C) Two cleavage planes intersecting at 120 D) A single planar cleavage
D ) The answer that best depicts the diagnostic cleavage that is typical of the mica group of minerals which include muscovite and bietet is a single, planar cleavage .
Cleavage is the splitting of minerals along natural planes of weakness
When there is only one cleavage plane, a single, planar cleavage known as the basal or pinacoidal cleavage takes place. cleaved at the base of the graphite. Mica (like muscovite or biotite) has basal cleavage, that's why mica can be peeled into thin sheets.
So single planar cleavage is answer of this question.
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