Q = I x t
Calculate the quantity of electricity, Q, obtained when a current of 25 amps runs for 1 minute.
Q = ? C
I = 25 A
t = 1 minute = 60 seconds
Q = 25 x 60 = 1,500 C
Calculate the current needed to provide 30,000 coulombs of electricity in 5 minutes.
Q = 30,000 C
I = ? A
t = 5 minutes = 5 x 60 = 300 seconds
I = Q ÷ t = 30,000 ÷ 300 = 100 amps
Calculate the time required to produce 12,000 C of electricity using a current of 10 amps.
Q = 12,000 C
I = 10 A
t = ?
t = Q ÷ t = 12,000 ÷ 10 = 1,200 seconds = 1,200 ÷ 60 = 20 minutes
Calculate the quantity of electricity obtained from 2 moles of electrons
Q = n x F
Q = ?
n = 2 mol
F = 96,500 C mol-1
Q = 2 x 96,500 = 193,000 C
Calculate the moles of electrons obtained from 250 C of electricity
n(e) = ? mol
Q = 250 C
F = 96,500 C mol-1
n(e) = 250 ÷ 96,500 = 2.59 x 10-3 mol
Ag+ + e -----> Ag(s)
moles of Ag(s) deposited, n(Ag) = moles of electrons required, n(e)
moles of Ag = n(Ag) = mass ÷ MM
mass Ag deposited = 56g
MM = 107.9 g mol-1 (from Periodic Table)
n (Ag) 56 ÷ 107.9 = 0.519 mol = n(e)
Q = ? C
n(e) = 0.519 mol
F = 96,500 C mol-1
Q = 0.519 x 96,500 = 50,083.5 C
Q = 50,083.5 C
I = 4.5 A
t = 50,083.5 ÷ 4.5 = 11,129.67 seconds
t = 11,129.67 ÷ 60 = 185.5 minutes
t = 185.5 ÷ 60 = 3.1 hours
I = 0.50 A
t = 10 seconds
Q = 0.50 x 10 = 5.0 C
Q = 5.0 C
F = 96,500 C mol-1
n(e) = 5.0 ÷ 96,500 = 5.18 x 10-5 mol
Cu2+ + 2e -----> Cu(s)
1 mole of copper is deposited from 2 moles electrons
n(Cu) = ½n(e) = ½ x 5.18 x 10-5 = 2.59 x 10-5 mol
MM = 63.55 g mol-1 (from Periodic Table)
mass (Cu) = (2.59 x 10-5) x 63.55 = 1.65 x 10-3 g = 1.65 mg
Calculate the minimum number of kilowatt-hours of electricity needed to produce the sodium metal.
Write the equation for the electrolysis of Na+:
Na+ + e -----> Na(s)
moles of Na(s) = moles of electrons used n(e)
n(e) = n(Na) = mass ÷ MM
mass = 1kg = 1,000g
MM = 22.99 g mol-1 (from Periodic Table)
n(e) = 1,000 ÷ 22.99 = 43.497 mol
n(e) = 43.497 mol
F = 96,500 C mol-1
Q = n(e) x F = 43.497 x 96,500 = 4.2 x 106 C
Q = 4.2 x 106
V = 4.5 V
E = 4.2 x 106 x 4.5 = 1.89 x 107 J
E = (1.89 x 107) ÷ (3.6 x 106) = 5.25 kWH
An electrolysis process is based upon movement and flow of ions. More is the solution dilute, more is the movement of ions and more is the conductance of solution. Thus, when the solution is dilute more copper ions flow to the electrode and get deposited there
Using a pH indicator such as litmus which displays a colour change based on the pH of the solution, or using a sold state digital probe which would give a numerical result on the display.
electrometry is a powerful technique of analytical chemistry , which is based on the electrical properties and involves measurement of current ,voltage, or resistance in relation to the concentration of a certain species in solution . Apart from electrogrvimetry where the material deposited on one of the electrodes is weighed after the electrolysis is carried out .
The effects will vary based on the amount of overpotential, the current density, the electrode materials used, and the concentration of the brine, but in general: - higher overpotential will increase the reaction rate - the brine will become warmer and thermodynamic efficiency decreases - side reactions are more likely to occur, such as electrode stripping and increased Cl2 production at anode
Elements are listed in the periodic table. Each element has its individual atomic number and symbol. The atomic number is based on the number of protons within the nucleus of the atom. As of 2006 the table contained 117 chemical elements. 94 found naturally on earth and the rest are synthetic elements that have been produced artificially in particle accelerators.
Many elements are discovered by electrolysis, many technological processes are based on electrolysis.
electric motor and electric generator
Numerical relays are all microprocessor based, but there are relays that take the advantage of microprocessor technology and are not fully numerical. In other words, if a relay is fully based on processing the samples of input signals it is numerical relay.
quantiative.
No, they are both copper based. Copper and steel cause the problem.
Stem and leaf plot
The answer is Statistics
Digital computer
Frank Stenger has written: 'Handbook of sinc numerical methods' -- subject(s): Differential equations, Numerical solutions, Galerkin methods 'Numerical methods based on Sinc and analytic functions' -- subject(s): Differential equations, Galerkin methods, Numerical solutions
Probability is a numerical measure. Occasionally, though, it is expressed in words such as very likely or not at all likely. But these phrases are (or should be) based on the fact that probability itself is a number.
Terminal digit filing is a filing system used to organize numerical records in numerical order. In this system, the last digit of each record is used as the filing criterion. To convert straight numerical to terminal digit filing, you must first identify the last digit in each numerical record. Then, you must organize the records in numerical order based on the last digit. For example, if the numerical records are 12, 21, 17, and 31, the last digits are 2, 1, 7, and 1, respectively. The records should be organized in numerical order based on the last digit to be 1, 1, 2, 7 (21, 31, 12, 17).
A type of research that is usually based on numerical measurements is known as quantitative research. This style of research is used to examine relationships among variables, describes variables, and is useful in determining cause and effect interactions between variables.