Answer:
B
Explanation:
The mechanism of this process: the electrolytic cell converts the electrical energy to chemical energy, using external energy source.
The statement which describes one characteristic of an operating electrolytic cell is it requires an external energy source.
Hence, option (B) is correct answer.
What is Electrolytic Cell ?Electrolytic cell can be defined as an electrochemical device that requires an external source of electrical energy to facilitate a non-spontaneous redox reaction. It converts electrical energy in to chemical potential energy and this process is called electrolysis. In electrolytic cell anode is positive and cathode is negative.
What is Non-spontaneous redox reaction ?A nonspontaneous redox reaction occurs when an external voltage is applied. Electrolytic cell is non spontaneous redox reaction.
Thus, from above conclusion we can say that The statement which describes one characteristic of an operating electrolytic cell is it requires an external energy source.
Hence, option (B) is correct answer.
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At standard pressure (760 mm) water boils at 100C. A vacuum pump is used to reduce the ambient pressure above water under a sealed bell jar. By reducing the pressure, the boiling point is lowered so that the water begins to boil at room temperature. What is the approximate pressure at which water boils at room temperature (22C)?
Answer:
601mmHg.
Explanation:
Step 1:
Data obtained from the question.
Initial pressure (P1) = 760mmHg
Initial temperature (T1) = 100°C = 100°C + 273 = 373K
Final temperature (T2) = 22°C = 22°C + 273 = 295K
Final pressure (P2) =..?
Step 2:
Determination of the new pressure at which the water will boil.
The new pressure on the at which the water will boil can be obtained as follow:
P1/T1 = P2/T2
760/373 = P2/295
Cross multiply to express in linear form
373 x P2 = 760 x 295
Divide both side by 373
P2 = (760 x 295) / 373
P2 = 601mmHg
Therefore, the new pressure at which the water will boil is approximately 601mmHg.
Answer:
C. 18-20 mm
Explanation:
are energy levels and orbitals the same thing?
Answer:
No they are not
Explanation:
Energy levels of electrons have fixed distance from the nucleus of an atom where electrons may be found.
orbitals is the path that electrons revolve
Calculate the Zn conc. of Zn/Zn++ // Cl/Cl- 0.1M Emf=2.21v
answers:
a)0.1M
b)0.2M
c)0.05M
d)0.15M
Thanks!
Answer:
Option a. = 0.01 M
Explanation:
To do this, we need to gather the data:
E = 2.21 V
[Cl⁻] = 0.1 M
And the Redox reaction taking place is the following:
Zn(s) + Cl₂(g) <-------> Zn²⁺(aq) + 2Cl⁻(aq) Q = [Zn] [Cl]²
E° Cl⁻/Cl₂ = 1.36 V
E° Zn/Zn²⁺ = -0.76 V
According to this, the expression to use will be the Nernst equation, and we can assume we are working at 25 °C, therefore, the Nernst equation will be:
E = E° - (0.059/n) logQ
E = E° - (0.059/n) ln([Cl⁻]² * [Zn²⁺]) (1)
From there, we can solve for Zn later.
First, we need to write the semi equation of oxidation and reduction, and get the standard potential of the cell:
Zn(s) --------> Zn²⁺(aq) + 2e⁻ E₁° = 0.76 V
Cl₂(g) + 2e⁻ -----------> 2Cl⁻(aq) E₂° = 1.36 V
---------------------------------------------------------------
Zn(s) + Cl₂(g) -------> Zn²⁺(aq) + 2Cl⁻(aq) E° = 0.76 + 1.36 = 2.12 V
Now, let's replace in (1) and then, solve for [Zn]:
2.21 = 2.12 - (0.059/2) log ([0.1]² * [Zn])
2.21 - 2.12 = -0.0295 log (0.01[Zn])
- 0.09 / 0.0295 = log (0.01[Zn])
-3.0508 = log (0.01[Zn])
10^(-3.0508) = 0.01[Zn]
8.8961x10⁻⁴ = 0.01[Zn]
[Zn²⁺] = 0.08896 M
This value can be rounded to 0.1 M. so the correct option will be option A.
Order the following in terms of decreasing ionization energy:
N, F, C,O,B
Answer:
F, N O, C, B
Explanation:
Ionization on the periodic table, goes from left to right, so in order to decrease in ionization, you go right to left.
Therefore leading to (F)luorine, (N)itrogen, (O)oxygen, (C)arbon, and (B)oron
Pleasee help me (15 points)
Answer:
Full moon.
Explanation:
This diagram shows a full moon because the sunlight is shining directly onto the side of the moon facing the earth in this instance.
Answer:
It is A
Explanation:
1. What type of reaction occurs when an acid reacts with a base?
Balance these chemical equations mg(s)_ + _N2(g) = _mg3N2
Answer:
[tex]3 Mg(s) + N_2(g) = Mg_3N_2(s)[/tex]
Explanation:
The valance of magnesium atom is [tex]+2[/tex]
While the valence of nitrogen atom is [tex]- 3[/tex]
Let us first write the first half-reactions
[tex]Mg ---> Mg^{2+} + 2e^{-}[/tex]
The second half reaction is
[tex]2N + 6e^- -----> N_2[/tex]
Adding the above two reactions and writing the final reaction, we get -
[tex]Mg + N2 = Mg_3N_2[/tex]
The balance equation is
[tex]3 Mg(s) + N_2(g) = Mg_3N_2(s)[/tex]
What types of reactions is shown below? check all that apply 2H2O2–>2H2O+O2
A) synthesis
B) decomposition
C) combustion
Answer:
Type of reactions :
Decomposition (O is seperated)What volume of 17.8 M stock sulfuric acid solution would be needed to make 2.0L of 0.200 M diluted sulfuric acid solution?
Answer:
Required Volume is 22.47ml
Explanation:
To make 2.0L of 0.2M sulfuric acid required moles = 0.2 x 2 = 0.4 moles
To get 0.4 from 17.8M required quantity = 1000/17.8 x 0.4 = 22.47ml
How many grams of beryllium phosphate are produced when 38 grams of beryllium oxide reacts with iron (III) phosphate? Show your work.
3BeO + 2FePO₄ → Be₃(PO₄)₂ + Fe₂O₃
Answer: 305 g of [tex]Be_3(PO_4)_2[/tex] will be produced from 38 grams of beryllium oxide
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} BeO=\frac{38g}{25g/mol}=1.52moles[/tex]
[tex]3BeO+2FePO_4\rightarrow Be_3(PO_4)_2+Fe_2O_3[/tex]
According to stoichiometry :
3 moles of [tex]BeO[/tex] produce = 1 mole of [tex]Be_3(PO_4)_2[/tex]
Thus 1.52 moles of [tex]BeO[/tex] will produce =[tex]\frac{1}{3}\times 1.52=0.507moles[/tex] of [tex]Be_3(PO_4)_2[/tex]
Mass of [tex]Be_3(PO_4)_2=moles\times {\text {Molar mass}}=0.507moles\times 602g/mol=305g[/tex]
Thus 305 g of [tex]Be_3(PO_4)_2[/tex] will be produced from 38 grams of beryllium oxide
1. Energy is required for chemical
reactions to take place. What form of
energy is used in cooking?
Benzene, C6H8, has an enthalpy of fusion = 10.19 kJ/mol. Calculate the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C?
1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.
What is energy?In order to perform work and to produce heat and light, energy must be delivered to a body or to an external physical system. Energy is a quantitative property. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.
A moving object's kinetic energy, an object's potential energy, an object's elastic energy, chemical energy linked to chemical reactions, electromagnetic radiation's radiant energy, and the internal energy of a thermodynamic system are examples of common kinds of energy.
mole of benzene = 85.2/78.11 =1.09mol
1 mole of benzene requires 10.19 kJ/mol energy
1.09 mole of benzene requires 1.09× 10.19 kJ/mol = 11.107kJ/mol energy
= 1107 Joule energy
Therefore, 1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.
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How much energy is required to heat 250 grams of water from 20.0°C to 80.0°C? The heat capacity of water is 4.186 J/g°C
Q=mc∆T
Answer:
62,790J
Explanation:
Q=mcT
= 250g*4.186J/gc*80-20
=250*4.186*60=62,790J
A gas at 80 kPa occupies a volume of 5 mL. What volume will the gas occupy at 70 kPa
Answer:
Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]
Explanation:
As per the gas law
[tex]P_1V_1 = P_2V_2[/tex]
Here
[tex]P_1 =[/tex] initial pressure of the gas
[tex]P_2[/tex] = final pressure of the gas
[tex]V_1 =[/tex] Initial volume of the gas
[tex]V_2[/tex] = the final volume of the gas
here,
[tex]P_1 = 80[/tex] kPa
[tex]V_1 = 5[/tex] mL
[tex]P_2 = 70[/tex]
Substituting the given values in above equation, we get -
[tex]80 * 5 = 70 * V_2\\V_2 = 5.71[/tex]
Volume will the gas occupy at [tex]70[/tex] kPa [tex]= 5.71[/tex]
What two agents are the biggest proponents of chemical weathering?
Answer:
water and carbon dioxide
Explanation:
Chemical weathering is the process of changing the composition of a mineral in order to break it down. The two agents that are the biggest proponents of chemical weathering are water and carbon dioxide. Water is used in a process called Hydrolysis which uses it to break down substances such feldspar in granite rocks changing to clay. While Carbon Dioxide in the atmosphere dissolves in rainwater forming carbonic acid, which slowly dissolve rocks when it comes into contact with them.
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves. How should the table be changed to correctly distinguish between mechanical and electromagnetic waves? Earthquake waves and radiation waves need to change places. Light waves and X-ray waves need to change places. Ocean waves and X-ray waves need to change places. Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places
Explanation:
Just did this assignment on edge. Sound waves are mechanical because they need matter to travel through, while light waves are electromagnetic.
Answer:
Sound waves and light waves need to change places
Explanation:
An elements’ neutral atoms have 5 valance electrons and 3 electron shells. What element is it?
Answer:
Phosphorus
Explanation:
Group 5A has 5 valence electrons.
3 electron shells equals 15 electrons on Phosphorus. Furthermore, 2 on shell 1, 8 on shell 2, and 5 on shell 3.
- Hope that helps! Please let me know if you need further explanation.
Which is associated with a fission reaction? *
6 points
hydrogen nucleii
radioactive waste
reactant with light mass
containment problem
Answer: Radioactive waste
Explanation:
The nuclear fission reaction consists of heavy atomic particles or heavy nucleus, like plutonium and uranium and in radioactive heavy metals. In the fission reaction the nucleus get split into equal masses of particles. This process is associated with release of large amount of energy. The fission of radioactive waste can cause deadly mutations in living beings.
What are the 5 categories of the food chain?
Answer:
Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
Decomposer
Un compuesto tiene la siguiente composición en tanto por cien: 19,3% de Na, y 26,9% de S y 53,8% de O. Su peso molecular es 238.Calcula la fórmula molecular
Answer:
[tex]NaSO_{4}[/tex]
Explanation:
Asúmase que existen 100 gramos de compuesto, las cantidades molares de cada componente son, respectivamente: (Let assume that exist 100 grams of the composite, the molar quantities of each component are, respectively:)
Na
[tex]n = \frac{19.3\,g}{22.99\,\frac{g}{mole} }[/tex]
[tex]n = 0.839\,moles[/tex]
S
[tex]n = \frac{26.9\,g}{32.065\,\frac{g}{mole} }[/tex]
[tex]n = 0.839\,moles[/tex]
O
[tex]n = \frac{53.8\,g}{15.999\,\frac{g}{mole} }[/tex]
[tex]n = 3.363\,moles[/tex]
La fórmula molecular empírica es (The empirical molecular formula is):
[tex](Na_{0.839}S_{0.839}O_{3.363})_{1.192}[/tex]
[tex]NaSO_{4}[/tex]
A student claims that if she wanted to make a solution quickly, she should use small pellets instead of powder along with heating and stirring. Do you agree or disagree with the student's claim? I am confused on this so I would greatly appreciate anyone’s help.
Answer: Yes, the student is right, one should use pellets of the reactant should be heated and stirred for mixing properly.
Explanation:
In case of smaller particles the surface area that is being exposed increases and the due to this the reaction occurs faster.
Increasing the temperature of the temperature, increases the kinetic energy of the particles which helps in easy mixing of the particles.
The collision in between the particles also increase while stirring and thus the rate of reaction increases.
So, the heating and stirring is more preferred over powered reactant for making a solution quickly.
Vaporization that takes place inside a liquid is called________.
Answer:
evaporation
Explanation:
Answer:
Boiling
Explanation:
When a substance transitions from liquid to gas, it's called evaporation if it's on the surface, and boiling if it's all throughout the liquid.
Picture boiling water in a pot: it starts on the bottom, and the bubbles go toward the top. Evaporation starts on the surface.
What is the definition of density
How compact a certain object or person is
Answer:
Density is a measure of mass per unit of volume.The average density of an object equal its total mass divided by its total volume.
Give an example of a system in which people use steam for a mechanical advantage.
Answer:
Turbines.
Explanation:
Hello,
In this case, we define steam as high-energy vapor water, which has the capacity to be cooled to release energy to a system. For instance, turbines, use overheated steam to produce energy, by feeding the steam to the turbine's rotor blades in order to make the rotate and generate work. As a consequence of the rotation, the steam loses energy, for which it goes out from the turbine at low both temperature a pressure, even do, in some cases it could go out liquid so a condensation may occur.
Regards.
Answer:
Steam turbines
Explanation:
Mechanical advantage is used to describe the attainment of an amplified force output from a minimal force input
Steam is the water in gaseous form
Therefore, an example of where people use steam for mechanical advantage includes the steam turbines in power generation being turned by steam produced from burning water from a supply.
Here the expansion of the water to steam provides power to drive the the turbines so as to perform mechanical work.
4. All of the following are examples of natural causes of air pollution
except -
hurricans
factory emissions
forest fires
tornadoes
ANSWER PLEASE AND THANK YOU☺️(bless you btw)
Answer:
factory emissions
Explanation:
In some areas of the world, deserts are expanding into places that were once forests. During this process, some of the forest trees will die off because of the change in climate.
But, some of the trees may survive this process. What adaptation would give a tree a chance to survive this environmental change?
A) The growth of limbs that are skinnier and longer.
B) The use of cones to protect and eventually spread seeds.
C) The type of root system that can grow deep into the ground.
D) Increased hardness of the wood in the tree that allows it to grow higher, and absorb more sunlight.
Answer:
i would say (c)
Explanation:
Answer:c
Explanation:
why did early astronomers believe in the geocentric model?
HELP ME SOLVE THIS PLEASE
Answer:
B. 47.3
Explanation:
What is thermal equilibrium?
When 100.g Mg3N2 reacts with 75.0 g H2O, 15.0 g of NH3 is formed. What is the % yield?
Answer:
% yield = 44.5 %
Explanation:
Step 1: Data given
Mass of Mg3N2 = 100.0 grams
Mass of H2O = 75.0 grams
Mass of NH3 = 15.0 grams
Molar mass of Mg3N2 = 100.95 g/mol
Molar mass of H2O = 18.02 g/mol
Molar mass of NH3 = 17.03 g/mol
Step 2: The balanced equation
Mg3N2 + 3H2O → 3MgO + 2NH3
Step 3: Calculate moles
Moles = mass / molar mass
Moles Mg3N2 = 100 grams / 100.95 g/mol
Moles Mg3N2 = 0.99 moles
Moles H2O = 75.0 grams / 18.02 g/mol
Moles H2O = 4.16 moles
Moles NH3 = 15.0 grams / 17.03 g/mol
Moles NH3 = 0.88 moles
Step 4: Calculate the limiting reactant
For 1 mol Mg3N2 we need 3 moles H2O to produce 3 moles MgO and 2 moles NH3
Mg3N2 is the limiting reactant. It will completely be consumed (0.99 moles)
H2O is in excess. There will react 3*0.99 = 2.97 moles
There will be produced 2*0.99 = 1.98 moles of NH3
Step 5: calculate mass of NH3
Mass of NH3 = moles NH3 * molar mass NH3
Mass NH3 = 1.98 moles * 17.03 g/mol
Mass of NH3 = 33.7 grams
Step 6: Calculate the % yield
%yield = (actual yield/ theoretical yield) * 100 %
% yield = (15.0 grams / 33.7) * 100 %
% yield = 44.5 %
The percentage yield of ammonia in the given reaction has been 44.44%.
The balanced chemical reaction can be:
[tex]\rm Mg_3N_2\;+\;3\;H_2O\;\rightarrow\;3\;MgO\;+\;2\;NH_3[/tex]
The moles can be given as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of [tex]\rm Mg_3N_2[/tex] = [tex]\rm \dfrac{100}{100.95}[/tex] molMoles of [tex]\rm Mg_3N_2[/tex] = 0.99 mol
Moles of [tex]\rm H_2O[/tex] = [tex]\rm \dfrac{75}{18.02}[/tex]Moles of [tex]\rm H_2O[/tex] = 4.16 mol
Moles of [tex]\rm NH_3[/tex] = [tex]\rm \dfrac{15}{17.03}[/tex]Moles of [tex]\rm NH_3[/tex] = 0.88 mol
The limiting reactant can be:
From the balanced equation for 3 moles of water, there has been 1 mole of magnesium nitrite. So, for 4.16 moles of water, there will be 1.38 moles of [tex]\rm Mg_3N_2[/tex]. Since the amount of [tex]\rm Mg_3N_2[/tex] has been completely consumed in the reaction, [tex]\rm Mg_3N_2[/tex] has been the limiting reactant.
So, the moles of ammonia produced =
1 moles [tex]\rm Mg_3N_2[/tex] = 2 moles ammonia.
0.99 moles [tex]\rm Mg_3N_2[/tex] = 0.99 [tex]\times[/tex] 2 moles [tex]\rm NH_3[/tex]
0.99 moles [tex]\rm Mg_3N_2[/tex] = 1.98 moles of ammonia.
The theoretical yield of ammonia = 1.98 moles
The actual yield of ammonia = 0.88 mol.
% Yield of Ammonia = [tex]\rm \dfrac{Actual\;yield}{Theoretical\;yield}\;\times\;100[/tex]
% Yield of Ammonia = [tex]\rm \dfrac{0.88}{1.98}\;\times\;100[/tex]
% Yield of Ammonia = 44.44 %
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