Answer:
C. ion concentrations are no longer changing and the voltage is 0.
Explanation:
Electrochemical cells are a device that generates current from redox reactions. In the cell, the equilibrium is reached when the voltage drops to 0. Thus, option C is correct.
What is an electrochemical cell?An electrochemical cell is a voltaic device that uses chemical energy to generate electrical energy and vice versa. It is of two types electrolytic and galvanic cells depending on the energy it produces.
The electrochemical cell comprises two electrodes namely an anode and cathode, a salt bridge or the porous barrier, and an external connection.
The connection shows the voltage that indicates the equilibrium. When the current flow stops and the voltage reaches zero, the electrochemical cell is said to be in equilibrium.
Therefore, no change in the ionic concentrations and zero voltage indicates equilibrium.
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Using these metal ion/metal standard reduction potentials calculate cell potential for Cu2+(aq) + Cd(s) →Cd2+(aq)+ Cu(s) Cu2+(aq)|Cu(s) + 0.34 VNi2+(aq)|Ni(s) -0.25 Cd2+(aq)/Cd(s) -0.4V
Solution :
Cd(s) ----------------------> [tex]Cd^{+2}[/tex] (aq) + 2[tex]e^-[/tex] , [tex]E_0[/tex] = 0.34 v
[tex]Cu^{+2}[/tex] (aq) + 2[tex]e^-[/tex] ------------> Cu (s) , [tex]E_0[/tex] = -0.04 v
----------------------------------------------------------------------------------------------
Cd(s) + [tex]Cu^{+2}[/tex] (aq) -------------> [tex]Cd^{+2}[/tex] (aq) + Cu (s) , [tex]E_0[/tex] = 0.30 v
The cell potential is defined as the measure of [tex]\text{ potential difference }[/tex] between the [tex]\text{two half cells}[/tex] of an electrochemical cell.
potassium permanganate + water = ? which product will they form,and in which phase is it?
KMnO4 + H2O = MnO2 + O2 + KOH
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6 What is cell wall? where is it found? insy.
Answer:
what is cell wall?
A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea
where is it found
They are found in bacteria, archaea, fungi, plants, and algae.
I want Brainliest plz!!
Answer:
The cell wall is the protective, semi-permeable outer layer of a plant cell. A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection.
step by step of how to convert fahrenheit and celsius to kelvins -5F to kelvins please and thank you
the volume of a gas is 568.4 ml at 23.2 if the temperature is increased to 93.4 without changing the pressure what is the new volume of the gas ?
Answer:
Do not incinerate "why the gas in the gas is initially at 23degree and 360kPa and the can has a volume of 350Ml
D
Balance
Mg +O2
NH3+ H2SO4
H20+O2
Answer:
MgO2
H202
NH4)2SO4
Explanation:
hope this helps you
Grease is applied to the moving part of machine.
Answer:
Explanation:
The moving part won't move on its own there's a force but the force isn't enough for something like a bike chain it need grease to move smoothly or else it will just be super stuck or slow.
Answer:
because grease produce more fiction which helps moving part of machine not get jamm while working
Which of the following is the formula for vanadium (II) oxide? Question 11 options: A) VO2 B) VO C) V2O3 D) V2O5
Answer: A. ( VO2)
Explanation:
Answer:
B) VO
Vanadium(II) oxide is the inorganic compound with the idealized formula VO.
A new stable element with an atomic number of 120 and an atomic mass of 246 is created in a particle accelerator. Enough of this element is created to determine that it combines with chlorine in a 1:2 ratio. Element 120 should be placed in the same group as _____ on the periodic table.
Answer:
Be,Mg,Ra etc
Explanation:
It should be palced in group 2A because as it reacts with chlorine in ratio of 1:2 . It's valancy is 2 and is metal as it react with non metal donating two electrons .
one more thing it fits there orderly
BF3 is the Lewis____in the
following reaction.
BF3(g) + F-(aq) → BF4 - (aq)
A. acid
B. base
Answer:
A
Explanation:
Its an acid.
How is an exothermic reaction indicated in an equation?
O A. Heat is written above the arrow in the equation.
O B. Heat is included as one of the reactants.
O C. Heat is included as one of the products.
D. Heat is added to both sides of the equation.
Answer:
Heat is included as one of the products for eg:
C+O2 gives CO2 + heat
hope it helps!
Explain why the reaction between lead oxide and carbon is called a redox reaction.....
Answer:
Explanation:
It's called a Redbox reaction because when a change in oxidation number occurs in a reaction, with both an increase in number and a decrease in number, then the reaction is classified as redox. If this doesn't occur, then the reaction is non- redox.
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why does increasing the pressure of a gas increase the reaction rate?
A. it increases the temperature of the gas.
B. it increases the reaction-rate constant.
C. it increases the activation energy.
D. if increases the number of collisions
Answer:
d it increase the number of collisions
Explanation:
cos collision is a type reaction to other particles
Hope that helps you
Please follow
Option A may be I think!!!!!
Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
Answer:
ionic
Explanation:
I'll put the rest if the answers in comments
Answer:
1. Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
*The bonds can shift because valence electrons are held loosely and move freely.*
2. Between which types of elements do ionic bonds occur, and how do electrons act within the bond?
*metals and nonmetals, electrons transferred*
3. Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
*ionic*
4. Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA?
*four covalent bonds*
5. How many covalent bonds is nitrogen (Group 5A) likely to form?
*three*
These are all the answers to the Bonds Quick Check.
Please help
I need answers now
Answer:
this is my answer.........
16. The valency of sodium is +1 and that of chlorine is -1, why?
Answer:
It because ,sodium is a metal and chlorine is a non metal
write the molecular formula of nitrate using criss cross method
Answer:
NO3 that is the answer to the question
Predict with a reason, what would happen to a packet of potato chips that is packed with air when it is taken to o high mountain.
Explanation:
If you bring an unopened bag of potato chips aboard an airplane you'll notice that the bag puffs up as the plane ascends to a higher altitude explain why this happens using the information and terminology you learned in this module
Which of the following type of matter has weakest interparticle force of attraction O a. Liquid water
O b. Iron
O c. Steam
O d. sand
Answer:(b)liquid water is correct option . Because it is a molecular solid and molecular solid has weak interparticle forces of attraction
Explanation:
What is occurring during boiling?
A. Solvent particles increase in kinetic energy until they knock solute particles out of the solution and into the air.
B. Solute particles increase in kinetic energy until they knock solvent particles out of the solution and into the air.
C. Vapor pressure is greater than atmospheric pressure and water molecules escape from the solution into the air.
D. Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air.
Reset Selection
Answer:
D: Atmospheric pressure is greater than vapor pressure,and water molecules escape from the solution into the air.
Atmospheric pressure is greater than vapor pressure, and water molecules escape from the solution into the air, which occurs during boiling. The correct option is D.
What is boiling?Boiling is a process when more heat is given to any liquid, it starts to boil. When the temperature is increased, boiling happens, but only in liquid. The molecules of liquid start to turn into vapor and start to escape into the atmosphere.
It is also called the vaporization of the liquid. The boiling points of different liquids are different, and they start to boil at their own temperature.
Thus, the correct option is D. Water molecules escape from the solution into the air when atmospheric pressure exceeds vapor pressure.
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HELP URGENT PLS!1!! In what direction and how many spaces must you move the decimal point to make the following conversion?
600 L to mL
left; 6 spaces
left; 6 spaces
left; 3 spaces
left; 3 spaces
right; 6 spaces
right; 6 spaces
right; 3 spaces
To convert from L to ml, we move three spaces to the right and the decimal place moves three places.
Our task here is to convert 600 L to mL. we have to remember that to convert from L to ml, we have to multiply the value in L by 1000
In other words, the value 1000 is known as the conversion factor.
When we do this, we move the decimal place three places to the right to have 600000.00mL
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what is the product of SO2+H2O.
Answer:
H2O + SO2 → H2SO3
Explanation:
H2O + SO2 → H2SO3
Answer:
l think this is the answer .
What is known about a reaction with a positive enthalpy?
Answer:
"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."
Explanation:
When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. When enthalpy is negative and delta H is less than zero, this means that a system released heat. This is called an exothermic reaction.
What does a high positive enthalpy mean?
The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.
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Read ""the Ozone Hole"" and answer the question below list at least three scientific disciplines related to chemistry mentioned or alluded to in the article
Answer:
Any 3 of the following:
atmospheric science
environmental science
climate science
biology
astronomy
human physiology and medicine
Explanation:
Got it right on edge 23
Luisa is flying from Dallas to New York to visit her cousin. Her carry-on bag weighs 39.4 lbs. However, there is a weight restriction of 18 kg per bag. Will she be permitted to bring her bag on the plane?
An atom has mass number 23 and atomic number 11.
a) How many electrons are revolving around the nucleus?
b) How many electron shells are there in the atom?
A): The closest orbital to the nucleus, called the 1s orbital, can hold up to two electrons. This orbital is equivalent to the innermost electron shell of the Bohr model of the atom. It is called the 1s orbital because it is spherical around the nucleus. The 1s orbital is always filled before any other orbital.
10th grade chemistry pls help!!
Express each answer to the correct number of significant figures.
Answer:
410-52=358
3.054+1.16=4.214
Plzzz help do your best to answer these questions
The empirical formula is the simplest formula of a chemical compound.
To find the empirical formula, we take the following steps;
Divide the percentage by mass of each element by its relative atomic mass.Divide the quotient of each by the lowest value obtained instep 1 aboveWrite the result of step 2 above as the subscript following each atom.1) O - 88.10/16, H - 11.190/1
O - 5.5, H - 11.19
O - 5.5/5.5, H - 11.19/5.5
O - 1, H - 2
Empirical formula = OH2
2) C - 41.368/12 H - 8.101/1, N - 32.162/14, O - 18.369/16
C - 3, H - 8, N - 2, O - 1
C - 3/1, H - 8/1 N - 2/1 O - 1/1
C - 3, H - 8, N - 2, O - 1
Empirical formula = C3H8N2O
To obtain the molecular formula where n = number of atoms of each element;
Molecular weight = 174.204 g/mol
[ 3(12) + 8(1) + 2(14) + 16]n = 174
n= 174/88
n = 2 (to the nearest whole number)
Hence, we have;
[C3H8N2O]2
The molecular formula is C6H16N4O2
3) C - 19.999/12, H - 6.713/1, N - 46.646/14, O - 26.641/16
C - 2, H - 7, N - 3, O - 2
C - 2/2, H - 7/2, N - 3/2, O - 2/2
C - 1, H - 4, N - 2, O - 1
Empirical formula - CH4N2O
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who was the first person to go to the moon
Answer:
The first person to go to the moon
Explanation:
Neil Armstrong was the first person !
heres more info on NASAs page!
https://www.nasa.gov/audience/forstudents/k-4/stories/first-person-on-moon.html
Why does Ce2(SO3)3 have a lower solubility than KCl?
Answer:
Down vote
A saturated solution is at equilibrium (rate of dissolution is equal to rate of crystallization) with some equilibrium constant K1. If you change the temperature of the system at equilibrium, you will observe a different equilibrium constant K2. Whether the equilibrium constant increase or decreases is described by the Van't Hoff equation:
ln(K2K1)=−ΔHR(1T2−1T1)
So it depends on the sign of the enthalpy of reaction, in this case the enthalpy of dissolution.
