The current required to plate out 2.96 g of nickel from the solution of Ni²⁺ in 27.12 minutes is 5.95 A
Balanced equationWe'll begin by writing the balanced equation showing the number of faraday required to plate nickel. This is given below
Ni²⁺ + 2e —> Ni
Molar mass of Ni = 59 g/mol
Mass of Ni from the balanced equation = 1 × 59 = 59 g
Number of faraday = 2 F
1 faraday = 96500 C
2 faraday = 2 × 96500 = 193000 C
SUMMARY
From the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
How to determine the quantity of electricityFrom the balanced equation above,
59 g of Nickel was deposited by 193000 C of electricity
Therefore,
2.96 g of Nickel will be deposited by = (2.96 × 193000) / 59 = 9682.71 C of electricity
How to determine the current Quantity of electricity (Q) = 9682.71 CTime (t) = 27.12 mins = 27.12 × 60 = 1627.2 sCurrent (I) =?I = Q / t
I = 9682.71 / 1627.2
I = 5.95 A
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The current required to plate out 2. 96 g of nickel from a solution of ni2 in 27. 12 minutes is 5.95 ampere.
What is current?Current is a charged particle moving through an electrical conductor.
The equation is [tex]\rm Ni^2^+ + 2e = Ni[/tex]
step 1: calculate the mass of Ni
Molar mass of Ni is 59 g/mol
59 × 1 = 59 g
Step2: calculate the number of Faraday
no. of Faraday is 2F
1 Faraday = 96500 C
then, 2 Faraday is equal to 2 × 96500 = 193000 C
Step 3: calculate the quantity of electricity
59 g of Nickel is deposited by, 193000 C of electricity
So, for 2.96 g of nickel
[tex]\dfrac{2. 96\;g \times 193000}{59} = 9682.71 \;C[/tex]
Step4: calculate the current:
Electricity Q = 9682.71 C
Time = [tex]27.12 \times 60 = 1627.2 \;s[/tex]
To find current
[tex]I = \dfrac{Q}{t} \\\\I = \dfrac{9682.71 }{1627.2}\\I = 5.95 A[/tex]
Thus, the current required is 5.95 ampere.
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Consider the two‑step synthesis of 2‑hydroxy‑2,4‑dimethylpentanoic acid using the reagents provided
The two step synthesis 2‑hydroxy‑2,4‑dimethyl pentanoic acid of involves compounds as represented in the attached image.
Two step synthesis of organic compoundsFrom the task content:
It therefore follows that the Starting compound A and intermediate compound B are as represented in the attached image.
Compound A is 4-methyl pentan-2-oneRemarks: The reagents provided are, H3O, Potassium cyanide and Hydrogen cyanide.
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The graph shows the potential energy diagram for an unknown chemical change.
Which chemical change could the graph represent? (1 point)
Group of answer choices
Electrolysis of water
Combustion of iron
Photosynthesis in plants
Adding heat to decompose calcium carbonate
Based on the energy usage shown by the graph, the best option for the chemical change represented is the combustion of iron.
What chemical change is shown by the graph?The combustion of iron in oxygen leads to the formation of Iron (III) oxide in solid form.
For the combustion of iron to happen, a lot of heat has to be applied to the iron which is why the potential energy of reactants is high. As the reaction progresses, the energy needed reduces as iron (III) oxide is formed.
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How do changes in the atmosphere from burning fossil fuels affect plant life? Select the two correct answers.
Increased carbon dioxide levels slow plant growth.
Acid rain removes nutrients from soil.
Increased nitrogen dioxide levels provide nutrients for plants.
Warmer temperatures support plant growth.
Increased ozone levels slow plant growth.
What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)
Ocean waters become more acidic.
Ocean temperatures rise.
Ocean levels rise.
Oceans are better able to support most sea life.
Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)
helium oxide
dihydrogen oxide
nitrogen dioxide
argon dioxide
sulfur dioxide
How does the use of fossil fuels affect the cryosphere?(1 point)
Acid rain containing sulfur dioxide corrodes sea ice and glaciers.
Higher levels of greenhouse gases in the atmosphere cause sea ice to melt.
Higher levels of ground-level ozone protect glaciers from the sun's rays.
Particulate matter in the atmosphere helps new glaciers form.
Why are rising carbon dioxide levels in the atmosphere harmful?(1 point)
Carbon dioxide increases people's risk of asthma.
Carbon dioxide blocks the sun's rays from reaching Earth's surface.
Carbon dioxide traps heat in Earth's atmosphere.
Carbon dioxide harms plant life.
Acid rain removes nutrients from soil and Ocean waters become more acidic.
Effect of burning fossil fuels on plant life and atmosphereOcean waters become more acidic when carbon dioxide from the atmosphere dissolves in seawater because the carbondioxide reacts with water produces carbonic acid.
When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain.
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Answer:
How do changes in the atmosphere from burning fossil fuels affect plant life? Select the two correct answers.
-Acid rain removes nutrients from soil.
-Increased ozone levels slow plant growth.
What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)
-Ocean waters become more acidic
Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)
-nitrogen dioxide
-sulfur dioxide
How does the use of fossil fuels affect the cryosphere?(1 point)
-Higher levels of greenhouse gases in the atmosphere cause sea ice to melt.
Why are rising carbon dioxide levels in the atmosphere harmful?(1 point)
-Carbon dioxide traps heat in Earth's atmosphere.
Explanation:
Identifying balanced and unbalanced forces
Identify the situations that have an u balanced force. Check all that apply
A baseball speeds up as if it falls through the air
A soccer ball is at rest on the ground
An ice skater glides in a she ighr like at a constant speed
A bumper car hit by another car moves off an angle
A bin goes across the room when the air is released
Can you dissolve. 35 moles of potassium permanganate (kmno4) into 500 ml of water? _________ why? / why not?
Yes, we can dissolve 35 moles of KMnO₄ into 500 mL of water to give a molarity of 70 M
What is molarity?Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the molarity Mole of KMnO₄ = 35 moles Volume = 500 mL = 500 / 1000 = 0.5 L Molarity =?Molarity = mole / Volume
Molarity = 35 / 0.5
Molarity = 70 M
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We can not dissolve 35 moles of potassium permanganate into 500 ml of water as it produces the solution with higher molarity than water have.
What is molarity?Molarity of any solution is define as the number of moles of solute present in per liter of the solvent as:
M = n/V
The molarity of the solvent, water, is the highest for aqueous solutions and molarity of 1000g of pure water in 1 liter is 55.5M
Given that,
n = moles of potassium permanganate = 35 molesV = Volume = 500 mL = 500 / 1000 = 0.5 LOn putting values, we get
M = 35/0.5 = 70M
Preparation of this solution is impossible.
Hence, KMnO₄ will not dissolve in the water as it produces solution with higher molarity than water.
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what is fractional distinction?
Answer:
ANSWERFractional distillation is a technique used to separate miscible liquids that have boiling point difference of less than 25 ºC. The only difference in apparatus between simple and fractional distillation methods is the use of a fractionating column used during fractional distillation.[tex]\sf\large\underline\purple{Fractional\: Distillation:-}[/tex]
Fractional distillation is a type of distillation which involves the separation of miscible liquids.[tex]\rightarrow[/tex]The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.
[tex]\rightarrow[/tex]The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.
[tex]\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}[/tex]
Fractional distillation is used for the purification of water as well as separating acetone and water.Fractional distillation is used in several industries like oil refineries and chemical plants mainly for purification and separation of many organic compounds.Fractional distillation is also used for the separation of (liquefied) air. Components like liquid nitrogen and oxygen as well as concentrated argon are obtained.Distillation is used in the production of high-purity silicon from chlorosilanes. The silicon is widely used in semiconductors.________________________________
Hope it helps you:)
calculate the number of mole and molecule in 10g water
Answer:
1 mole of water weighs 18g. 10/18 moles = 10/18 * 6 * 10^23 number of molecules = 3.33 * 10^23 molecules of water. Each molecule of water has 3 atoms, so the total number of atoms in 10g of water is 3*3.33*10^23 = 10^24.
Explanation:
PLS HELP ASAP ILL MARK BRAINLIEST. And this is science btw.
Answer:Opposite
Explanation:
A) 2 and 3 only
B) 1 and 4 only
C) 2,3,4 only
D) all of the above
choose one correct answer
Answer:
D
[tex] \: \: \: \: [/tex]
Calculate the [H+] in a 1.0 M solution of HA
A container with a volume 2.0 l is filled with a gas at a pressure of 1.5 atm. by decreasing the volume of the container to 1.0 l, what is the resulting pressure? type in your answer using the correct number of significant figures. remember to use the formula for boyle's law: p1v1 = p2v2 atm
Answer:
3.0 atm
Explanation:
got it right on edge after guessing 2 times
The resulting pressure of the gas after decreasing the initial volume is 3 atm.
What is Boyle's Law?According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:
P ∝ 1/V
For the given question required equation is:
P₁V₁ = P₂V₂, where
P₁ = initial pressure = 1.5 atm
V₁ = initial volume = 2 L
P₂ = final pressure = ?
V₂ = final volume = 1 L
On putting all these values on the above equation, we get
P₂ = (1.5)(2) / (1) = 3atm
Hence required pressure is 3 atm.
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What is the difference between a reflected and a diffracted sound wave?
Answer:
Diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.
Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another
Explanation:
If we use water waves as an example, waves hitting shallower water at an angle will slow down and change direction slightly. That is refraction
Waves hitting an island will bend and eventually close in on the "shadow" of the island. That is diffraction
How long will hydrogen peroxide make a dog throw up?.
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 2.76324 kPa to _____ torr
Given the pressure in KPa, the value of the pressure reading in torr obtained is 20.73 torr
Conversion scale101.325 KPa = 760 torr
Data obtained from the question Pressure (KPa) = 2.76324 KPa Pressure (torr) =? How to determine the pressure in torrThe value of the pressure in torr can be obtained as illustrated below:
101.325 KPa = 760 torr
Therefore,
2.76324 KPa = (2.76324 × 760) / 101.325
2.76324 KPa = 20.73 torr
Thus, 2.76324 KPa is equivalent to 20.73 torr
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7.13 g of NaF are dissolved in enough water to make 201 mL of solution. What is the molarity of this solution
Answer:
0.846MExplanation:
To find the molarity, we have an equation: moles ÷ liter.
To find the moles of NaF, take the gram ÷ molar mass of NaF
7.13/42.0 = 0.170 moles of NaF
201 ml ÷ 1000 = 0.201L
0.170 ÷ 0.201 = 0.846MBased on the ksp experiment describe a way to soften water by removing calcium ions
Addition of sodium carbonate is a way to soften water by removing calcium ions
How calcium ions are removed?Water can be softened by the addition of lime to precipitate the calcium as carbonate. Sodium carbonate is also added to remove the remaining calcium salts and to make the water soft.
So we can conclude that addition of lime or sodium carbonate is a way to soften water by removing calcium ions.
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A process based on ksp experiment to soften the water by removing calcium ions is by ion exchange resin process in which the calcium ion is substituted by a sodium ion.
What is removing calcium ions from water?The water containing a large number of calcium ions is called hard water.
Hard water is not suitable to use.
To remove calcium ion or soften the water, there are various methods are used.
They are ion exchange resin, distillation, and sodium hydroxide.
Thus, a process based on ksp experiment to soften the water by removing calcium ions is by ion exchange resin process in which the calcium ion is substituted by a sodium ion.
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Is food a fuel? Explain your answer. a ?
Answer:
no, food is not a fuel because it just give energy to do many activities but it will not provide any fuel only the dead and decaying material which berries under the soil then after a long years it becomes fossil fuel
Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the
formula equation for this reaction?
+
1.F2(1) + Na(s) — NaF2(s)
2.F2(g) + Ca(s) — CaF20)
3 F2(g) + Na(s) — NaF 2(0)
4. F2(g) + Ca(s) __, CaF2(s)
Answer: B aka #2
Explanation:
The Chemical equation for this reaction is F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]. Therefore, the correct option is option B.
Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a plus sign separating the entities in the reactants and products, the reactant objects are listed on the left as well as the product objects are listed on the right.
The critical values of a stoichiometric values are shown as coefficients alongside the symbols or formulas of the various entities. Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. The formula equation for this reaction is
F[tex]_2[/tex](g) + Ca(s) → CaF[tex]_2[/tex]
Therefore, the correct option is option B.
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