a) [tex]\(Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-\)[/tex]
b) Standard cell potential: [tex]\(0.019 \, \text{V}\)[/tex]
c) Balanced equation: [tex]\(Cr(s) + Zn^{2+}(aq) \rightarrow Cr^{3+}(aq) + Zn(s)\)[/tex]
d) Cell potential at 25°C: [tex]\(0.0183 \, \text{V}\)[/tex]
a) The half-reaction that takes place at the anode is:
[tex]\[Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-\][/tex]
b) To find the standard cell potential [tex](\(E^{o} _{cell}\)[/tex]) for the electrochemical cell, you need to calculate the difference in standard reduction potentials [tex](\(E^{o} _{red}\))[/tex] for the two half-reactions:
[tex]\[E^{o}_{cell} = E^{o}_{red, cathode} - E^{o}_{red, anode}\]\[E^{o}{cell} = -0.744 \, \text{V} - (-0.763 \, \text{V})\]\[E^{o}{cell} = 0.019 \, \text{V}\][/tex]
The standard cell potential for this cell is 0.019 V.
c) The balanced equation for the overall reaction in acidic solution can be obtained by adding the two half-reactions:
[tex]\[Cr(s) + Zn^{2+}(aq) \rightarrow Cr^{3+}(aq) + Zn(s)\][/tex]
d) To calculate the cell potential[tex](\(E_{cell}\))[/tex] at 25°C with specific concentrations, you can use the Nernst equation:
[tex]\[E_{cell} = E^{o}{cell} - \frac{0.0592}{n} \log \left( \frac{[Zn^{2+}]}{[Cr^{3+}]} \right)\][/tex]
Given:
[tex]\[E^{o}{cell} = 0.019 \, \text{V}\]\[T = 25^{o}C = 298 \, \text{K}\]\[n = 2 \, \text{(number of moles of electrons exchanged)}\]\[Zn^{2+} = 0.00248 \, \text{M}\]\[Cr^{3+} = 0.00124 \, \text{M}\][/tex]
Plugging in the values:
[tex]\[E_{cell} = 0.019 - \frac{0.0592}{2} \log \left( \frac{0.00248}{0.00124} \right)\]\[E_{cell} \approx 0.0183 \, \text{V}\][/tex]
The cell potential at 25°C with the given concentrations is approximately 0.0183 V.
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In the given galvanic cell, oxidation will take place at the anode where the Zn/Zn2+ reaction occurs. The standard cell potential is 0.019 V. The balanced equation for the overall reaction in an acidic solution is: 3Zn(s) + 2Cr3+(aq) -> 3Zn2+(aq) + 2Cr(s).
Explanation:In a galvanic electrochemical cell, the anode is the electrode where oxidation occurs. The half-reaction with the more negative reduction potential usually undergoes oxidation, so in this case given the half-reactions: Cr3+(aq) + 3e- -> Cr(s) Ered = -0.744 V and Zn2+(aq) + 2e- -> Zn(s) Ered = -0.763 V, the Zn/Zn2+ reaction will take place at the anode.
To calculate the standard cell potential, we decide the cathode based on the half-reaction having less negative reduction potential that is the Cr/Cr3+ reaction. Subtract the anode Ered from the cathode Ered: (-0.744) - (-0.763) = 0.019 V.
For balancing the overall equation in acidic solution, multiply the first equation by 2 and the second equation by 3 (to equalize the electrons), then add them. The balanced equation will therefore be: 3Zn(s) + 2Cr3+(aq) -> 3Zn2+(aq) + 2Cr(s)
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129) Which of the following metals have the highest atomic mass?
A) Copper
B) Gold
C) Iron
D) Platinum
130) What does the atomic number of an element represent in an neutral atom?
A) Number of electrons and protons.
B) Number of electrons and neutrons.
C) Number of protons and neutrons.
D) Does not have a specific representation.
Answer:
B) Gold
A) Number of electrons and protons.
Explanation:
Atomic Masses (from periodic table):
----> Copper (Cu): 63.546 g/mol
----> Gold (Au): 196.97 g/mol
----> Iron (Fe): 55.845 g/mol
----> Platinum (Pt): 195.08 g/mol
The atomic number represents the number of protons. Neutral atoms have the same number of protons as electrons. The mass number represents the number of protons and neutrons.
Which one is the correct response?
Pollutants moving into underground water does not represent a social benefit of sustainable waste management.
What is sustainable waste management?It is the act of recycling wastes or reducing the amount of single-use products that end up as wastes in the environment.
By practicing sustainable waste management, fewer wastes are generated and lesser lands are used as landfills.
More lands become available and wastes are put to beneficial uses.
Pollutants moving into underground water is detrimental to the health of humans. Thus, it cannot represents one of the social benefits of sustainable waste management.
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The option that does not show the social benefit of sustainable waste management is leacha-te going into ground-water (Option D).
What is sustainable waste management?The term sustainable waste management has to do with the process in which pollutants are taken care of in a way that does not affect the environment.
The option that does not show the social benefit of sustainable waste management is leacha-te going into ground-water (Option D).
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When limestone is decomposed at high temperature and the residue is treated with water, the compound that is formed is
The compound that is formed is calcium hydroxide.
Preparation of calcium hydroxideWhen limestone is decomposed at a high temperature, calcium oxide is formed as the residue.
[tex]CaCO_3 --- > CaO + CO_2[/tex]
When the calcium oxide residue is treated with water, a calcium hydroxide solution is formed.
[tex]CaO + H_2O -- > Ca(OH)_2[/tex]
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Thyroid hormone contains the mineral thyroid hormone contains the ________.
i. mineral iodine.
ii. sodium.
iii. iron.
iv. zinc.
v. thallium.
Thyroid hormone contains the mineral iodine (option I). Details about thyroid hormone can be found below.
What is the thyroid hormone?Thyroid hormone is the hormone produced by the thyroid gland of the body, which is a large butterfly-shaped endocrine gland situated on the front of the neck that produces various hormones.
The thyroid hormone is responsible for regulating metabolism, which controls the amount of calories burnt in a day.
One of the major minerals found in the thyroid is iodine. The thyroid gland absorbs iodine from the bloodstream, and then stores it to aid in the production of thyroid hormones.
Therefore, the thyroid hormone contains the mineral iodine.
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please help me with this questio
The mass of the precipitate is 8.74 g and the concentration of the calcium nitrate is 0.061 M.
What mass of precipitate is formed?The reaction is given by; 2AgNO3(aq) + CaCl2 (aq) ------>2AgCl(s) + Ca(NO3)2(aq)
Number of moles of AgNO3 = 195/1000 * 0.500 = 0.0975 moles
Number of moles of CaCl2 = 305/1000 * 0.100 = 0.0305 moles
If 2 moles of AgNO3 reacts with 1 mole of CaCl2
0.0975 moles reacts with 0.0975 moles * 1 mole / 2 moles = 0.04875 moles
Thus CaCl2 is the limiting reactant.
1 mole of CaCl2 produces 2moles of AgCl
0.0305 moles produces 0.0305 moles * 2 moles/ 1mole
= 0.061 moles
Mass of precipitate = 0.061 moles * 143.32 g/mol
= 8.74 g
Now 1 mole of CaCl2 produces 1 mole of Ca(NO3)2
Total volume of solution = 195 ml + 305 ml = 500 ml or 0.5 L
Concentration of Ca(NO3)2 = 0.0305 moles/ 0.5 L
= 0.061 M
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The study of the structure of matter and the composition of substance, their properties, and their chemical reactions is called:
Answer: chemistry
Explanation: see definition on wikipedia.
When you are taking a test, you are awake and alert. this means that your brain is currently generating _____.
a. alpha wave
b. beta wave
c. theta wave
d. delta wave
When you are taking a test, you are awake and alert, which means that your brain is currently generating beta waves (Option b).
What are beta waves?The beta waves are a special type of brain waves observed by using electromagnetic devices (especially in physiology).
This type of waves are dominant during conscious thought as well as during cognitive logical thinking processes.
In conclusion, when you are taking a test, you are awake and alert, which means that your brain is currently generating beta waves (Option b).
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________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.
Hydrogen bonds are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.
The hydrogen bond is weak bond.The hydrogen bond is electrostatic force of attraction between hydrogen atom and more electronegative atoms or group ( like Florine , oxygen or nitrogen) which is contently bonded.The hydrogen bond is occur in polar , contently bond atoms in different molecules.Example is H-O-H or [tex]NH_{3}[/tex]The positively charged hydrogen side of one water molecule is bond with negatively charged oxygen side of another molecule.learn about Hydrogen bond
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Iansiqnsdijsijnweijnjwn
Answer:
What is your question?
Explanation:
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Answer:
Stan TXT
Explanation:
because they are amazing
Cabbage juice indicator solutions can show pH values from acidic to basic.
Which color represents the most basic solution?
Which color represents the most acidic solution?
Which color represents a neutral solution?
More acid solution has red colour, more basic solution has purple colour whereas neutral solution has green colour.
Which color represents the most acidic solution?As the solution becomes more acidic, the color of the solution changes from green toward red.
Which color represents the most basic solution?As the solution becomes more basic, the color changes of the solution from green toward purple.
Which color represents a neutral solution?Green color of the solution represents a neutral solution having pH 7.
So we can conclude that More acid solution has red colour, more basic solution has purple colour whereas neutral solution has green colour.
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Sarif is performing a lab experiment, and one of the chemicals is labelled with the
following WHMIS pictogram.
Identify one hazard associated with a chemical that is labelled with this
pictogram. What is one precaution Sarif should take?
Answer:
Sarif should wear protective gloves, protective clothing.
Explanation:
Nal+ Pb(SO4)2
→> products and reaction type
The reaction is based on law of conservation of mass.
The balanced chemical equation is
[tex]$4 \mathrm{NaI}+\mathrm{Pb}\left(\mathrm{SO}_{4}\right)_{2} \rightarrow \mathrm{PbI}_{4}+2 \mathrm{Na}_{2} \mathrm{SO}_{4}$[/tex]
What is law of conservation of mass?Every balanced chemical equation follows the direction of conservation of mass. This law states that mass can neither be completed nor can be destroyed but it can only be transformed from one condition to another form. This law likewise states that the total number of individual atoms on the reactant side must be comparable to the total number of individual atoms on the product side.
The Law of Conservation of Mass holds because naturally occurring elements are stable under the conditions located on the surface of the Earth. Most elements come from fusion reactions found only in stars or supernovae. Consequently, in the ordinary world of Earth, from the peak of the highest mountain to the depths of the deepest ocean, atoms are not transformed into other elements during chemical reactions. Because of this, individual atoms that make up living and nonliving subjects are very old and each atom have a history. An individual atom of a biologically essential element, such as carbon, may have expended 65 million years buried as coal before standing burned in a control plant, followed by two decades in Earth's environment before being disbanded in the ocean,To learn more about law of conservation of mass, refer:
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An intermetallic compound is found in the magnesium–gallium system that has a composition of 41. 1 wt% mg–58. 9 wt% ga. Specify the formula for this compound.
The formula of the compound will be [tex]Mg_2Ga[/tex]
Empirical formula of compoundsThe compound contains magnesium and gallium. The symbol and magnesium and gallium is Mg and Ga respectively.
Magnesium content is 41.1%
Gallium content is 58.9%
First, find the number of moles of each element in the compound by dividing their percentage compositions with their respective molar weights.
Mg = 41.1/24.505 =1.6772
Ga = 58.9/69.723 = 0.8448
Next, divide each number of moles by the smallest number of moles.
Mg = 1.6772/0.8448 = 2
Ga = 0.8448/0.8448 = 1
Thus, the formula of the compound is [tex]Mg_2Ga[/tex]
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The following is the reaction showing the complete neutralization of calcium hydroxide (a base) with phosphoric acid:
3Ca(OH)2(aq) + 2H3PO4(aq) → Ca3(PO4)2(s) + 6H2O(ℓ)
A stock solution of calcium hydroxide (base) is made by dissolving 3.51 grams of it into some water and the volume is brought to 750 mL. A 50.0 mL portion of that stock solution is then titrated with a solution of 0.229 M phosphoric acid. How many milliliters (mL) of the acid are needed to completely neutralize the base in this reaction? (tolerance is ±0.1 mL)
9.17 milliliters (mL) of the acid are needed to completely neutralize the base in this reaction.
What is a neutralization reactionA neutralization reaction is a reaction between an acid and a base to produce a salt and water only.
The process of reacting given volume of acids or bases to determine the concentration or volume of either the acid or base required for neutralization is known as titration in volumetric analysis.
The formula to determine the volume of the acid required is given below:
[tex]\frac{C_{a}V_{a}}{C_{b}V_{b}} = \frac {N_{a}}{N_{b}}[/tex]
where [tex]V_{a[/tex] is the volume of acid required
[tex]V_{a} = \frac {C_{b}V_{b}N_{a}}{C_{a}N_{b}}[/tex]
Concentration of base, Cb = (3.51/74)/0.75 = 0.063 M
Vb = 50. 0 mL
Ca = 0.229 M
Na = 2
Nb = 3
Va = (0.063 * 50 * 2)/(0.229 * 3)
Va = 9.17 mL
In conclusion, the volume of the acid is determined from the concentration, volume and mole ratio of the reaction.
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3 A+B 2C+D
What is the percent yield of the reaction if 7.00 mol of A actually formed 1.00 mol of
C?
Answer:
Percent Yield = 21.4% C
Explanation:
The actual yield is the value that was produced after conducting an experiment. The theoretical yield is the value calculated using the balanced chemical equation.
To find the percent yield, you need to (1) convert moles A to moles C (via the mole-to-mole ratio from equation coefficients) and then (2) calculate the percent yield. It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the values given.
3 A + B -----> 2 C + D
^ ^
7.00 moles A 2 moles C
--------------------- x ---------------------- = 4.67 moles C
3 moles A
Actual Yield
Percent Yield = ------------------------------ x 100%
Theoretical Yield
1.00 moles C
Percent Yield = ------------------------- x 100%
4.67 moles C
Percent Yield = 21.4% C
A positive correlation ______ a causal link, and a negative correlation ______ a causal link.
A. does not necessarily indicate, does not necessarily indicate
B. does not necessarily indicate, always indicates
C. always indicates, does not necessarily indicate
D. always indicates, always indicates
A positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A
What is correlation?In research, correlation often indicates that some kind of relationship does exist between the variables. This does not actually mean causation. The correlation could be positive or negative.
It should be known that; a positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A
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What are the standard temperature and pressure conditions enthalpy is usually measured under?
A. 1 kPa and 273 K
B. 100 kPa and 298 K
OC. 298 kPa and 100 K
D. 1 kPa and 100 K
Reset Selection
The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).
What is enthalpy?Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.
Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:
H = E + P V
Where;
H = Enthalpy
E = internal energy
P = pressure
V = volume
However, the enthalpy of a substance is usually measured under standard temperature and pressure.
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A bottle of Nitroglycerin has the labeled strength of l/200 grains. What would this strength be in milligrams
strength in milligrams is 0.3mg
What is Strength?Mass of the solute in grams/Volume of the solution in litres equals the strength of the solution. The overall formula must be multiplied by 1000 if the volume is measured in millilitres (mL). The concentration of the solution, measured in grammes per litre, can be used to determine the solution's strength.
Molarity - The moles of solute per litre of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grammes per mole. One molar solution, or 1M, is created by dissolving 58.44 grammes of sodium chloride in one litre of water.
Relation between Molarity and Strength?
The volume of solute in one litre of a solution determines its strength. As a result, a solution's strength is calculated by multiplying its molecular mass by its molarity.
1 grain = 64.8 milligrams.
1/200 grains = 64.8/200
= 0.3mg
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The table shows columns that brenda uses for her notes on the properties of elements. her notes state that some elements can react to form basic compounds. a 3-column table with 2 rows. the first row has entries metals, metalloids, nonmetals. the second row has entries nothing, nothing, nothing. where should brenda place this property in her table? only in the column for metalloids only in the column for nonmetals in the columns for metalloids and for nonmetals in the columns for metals and for metalloids
The element should be placed in the column for metalloids. Option A
What is the property of metals?We know that the properties of metals can be used to identify an unknown substances as a metal. We know that metals are able to react with acids to liberate the metal salt and hydrogen gas. Metals do not react with bases because they can not accept electrons.
Metalloids are generally amphoteric in nature. They can react with both the acid and the basses to form compounds. The nonmetals do not react with acid or base.
Looking at the result, we are told that the entry in the second row have the entries nothing, nothing, nothing. If this is the outcome, then it follows that the element should be placed in the column for metalloids.
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Answer: A
Explanation:
Hard-boiled eggs are made by placing eggs in boiling water until their whites and yolks solidify. Why does hard-boiling an egg take longer at high altitude than at sea level
Hard-boiled eggs are made by placing eggs in boiling water until their whites and yolks solidify. Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg.
Why do eggs turn hard when we boil them ?Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg. It takes longer for the water to reach 100°C.
Hard boiling an egg is a chemical change or physical change ?Hard boiling egg is a chemical change because the egg cannot back into its original form.
Chemical change are those changes in which substance changes chemical composition. These changes are permanent changes.
Thus from the above conclusion we can say that Hard-boiled eggs are made by placing eggs in boiling water until their whites and yolks solidify. Hard-boiling an egg take longer at high altitude than at sea level because the high altitude lowers the boiling point of the egg.
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why is fruit cake a heterogeneous mixture ??
Briefly explain how a titration experiment can be used to determine the concentration of a strong acid or strong base solution?
Answer:During an acid-base titration, an acid with a known concentration is slowly added to a base with an unknown concentration (or vice versa). A few drops of indicator solution are added to the base. The indicator will signal, by color change, when the base has been neutralizedExplanation:
Calculate the pH if the [H^+] = 9.71 ×
10^-8
Answer:
pH = 7.01
Explanation:
The pH can be calculated using the formula:
pH = -log[H⁺]
In this formula, [H⁺] represents the concentration of H⁺. Since you have been given this value, you can easily find the pH.
pH = -log[H⁺]
pH = -log[9.71 x 10⁻⁸]
pH = 7.01
How many moles of sucrose are in 5.25x10^29 sucrose molecules?
Answer:
8.72×10^5
Explanation:
Answered it in the comments! ^^
93.4 g of a metal is heated to 85.0 C in a hot water bath, then dropped into a calorimeter containing 342 ml of water
The specific heat capacity of the metal is determined as 0.76 J/g⁰C.
Mass of the watermass = density x volume
mass = 342 ml x 1 g/ml = 342 g
Specific heat capacity of the metalApply the law of conservation of energy;
Heat lost by the metal = Heat gained by the calorimeter + heat gained by water
(93.4)(85 - 29.3)c = (8.29)(29.3) + (342)(4.186)(29.3 - 26.7)
5,202.38c = 3,965.088
c = 3,965.088/5,202.38
c = 0.76 J/g⁰C
Thus, the specific heat capacity of the metal is determined as 0.76 J/g⁰C.
The complete question is below;
93.4 g of a metal is heated to 85.0 C in a hot water bath, then dropped into a calorimeter containing 342 ml of water (d 1.00 g/mL) at 26.7 . The equilibrium temperature was found to be 29.3 C. Calculate the specific heat of the metal with proper units. (C.cal 8.29 J/c)
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How does the phase diagram of a substance illustrate the relationship between temperature and kinetic energy of molecules
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance.
What is a Phase diagram ?These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points).
At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.The phase change between a liquid and a gas has some similarities to the phase change between a solid and a liquid.Learn more about Phase diagram here:
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Which of these is the byproduct of fuel combustion that may result in death if such combustion equipment is not properly vented.
a. radon
b. lead
c. oxygen
d. carbon monoxide
Carbon monoxide is the byproduct of fuel combustion that may result in death if such combustion equipment is not properly vented and is denoted as option D.
What is Carbon monoxide?This is a compound which is derived from the combustion of carbon in insufficient supply of oxygen. Carbon monoxide when inhaled replaces the oxygen content in the body which is dangerous because oxygen is needed for the survival of the cells of the body.
The carbon monoxide is usually formed when there is no properly vent thereby resulting in insufficient supply of air. This therefore results in its presence in the body results in the death of cells of the body system.
This is therefore the reason why carbon monoxide was chosen as the most appropriate choice.
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Which color change represents a positive reaction for the presence of sugar using the Benedict's test
Answer:
my best answer is blue
Explanation:
Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?
Boyle’s law
Dalton’s law
Charles’s law
Avogadro’s law
The law that states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant is Avogadro’s law. That is option D.
What is Avogadro’s law?Avogadro’s law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant.
Mathematically the Avogadro’s law can be represented by the following:
V1/n1= V2/n1
Where,
V1 = first volume
n1 = first amount of gas
V2 = second volume
n2 = second amount of gas
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Answer:D
Explanation:Trust me bro
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What can be done to double the power output of an object?
Neither of these
Both of these
Take half the time to do the work
Double the work done by the object