Determine the equilibrium constant at 255 K for the following reaction under acidic conditions.
4H+ (aq) + MnO₂ (s) + 2Fe²+ (aq) ———› Mn²+ (aq) + 2Fe³+ (aq) + 2H₂O(1)
The two half-reactions are:
MnO₂ (s) + 4H+ (aq) + 2e¯¯ ———› Mn²+ (aq) + 2H₂O(1) E* = 1.23 V
Fe³+ (aq) + e, Fe²+ (aq) E³ = .0.770 V
Answers
Temperature is supplied to us as 225 K. The reduction potential potentials will be used to get it equilibrium constant for the this reaction.
What does equilibrium mean in its simplest form?Definition of EQUILIBRIUM as a noun in the Britannica Dictionary. [noncount] 1. a condition when conflicting forces or acts are matched so that neither is stronger or more significant than the other.
What does the term "equilibrium" signify in biology?The forces that affect the body must balance out with an equivalent and opposing force for there to be a condition of equilibrium. The physiological state of equilibrium, wherein forces internal and external are all in balance, in an active moving animal. The system is hence stable.
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Related Questions
Light can bounce off objects. This is called reflection, and it's what allows us to see objects. This drawing shows a light ray reflecting from the blue construction paper. Although many light waves are hitting the paper and reflecting from it, showing just one ray helps us follow the path of a single wave. white light from flashlight blue light ray seen For each color of paper, which part of white light is reflected?
Answers
For each color of paper, the part of white light that is reflected depends on the color of the paper. When white light strikes an object, some of the light is absorbed by the object, some of it is transmitted through the object, and some of it is reflected.
The color of the object that we see is the color of the light that is reflected by the object.
For example, when white light strikes blue paper, the blue color of the paper absorbs all the other colors of the spectrum except blue, which is reflected back to our eyes. This is why we see the paper as blue. Similarly, when white light strikes red paper, the red color of the paper absorbs all the other colors except red, which is reflected back to our eyes. This is why we see the paper as red.
In summary, the color of an object is determined by the color of the light that is reflected by the object, and the color of the light that is reflected depends on the color of the object and the colors of the spectrum that are absorbed or transmitted by the object.
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Hydrogen reacts with oxygen according to the balanced equation
2H₂ (g) + O2(g) → 2H₂O(g). If X is the number of molecules of H₂ which react,
then the number of O2 molecules reacting is
Answers
Answer:
x/2
Explanation:
X = 2 molecules of H2
For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.
I hope I'm understanding this question right.
How many grams of sulfur dioxide will exert a pressure of 0.705 atm in a 2.50L tank at 0 °C?
Answers
The mass of sulfur dioxide required is approximately 6.36 grams.
To determine the number of grams of sulfur dioxide (SO2) required to exert a pressure of 0.705 atm in a 2.50L tank at 0 °C, we can use the ideal gas law equation: PV = nRT.
First, we need to convert the temperature from Celsius to Kelvin by adding 273.15, so the temperature becomes 273.15 K. The ideal gas constant (R) is 0.0821 L·atm/(mol·K).Rearranging the ideal gas law equation to solve for the number of moles (n), we get n = PV / RT.
Plugging in the given values, n = (0.705 atm) * (2.50 L) / [(0.0821 L·atm/(mol·K)) * (273.15 K)]. Calculating this expression, we find that n is approximately 0.0993 moles.The molar mass of sulfur dioxide is 64.06 g/mol (32.06 g/mol for sulfur + 2 * 16.00 g/mol for oxygen).
Finally, we can calculate the mass of sulfur dioxide using the formula: mass = n * molar mass = 0.0993 moles * 64.06 g/mol. Thus, the mass of sulfur dioxide required is approximately 6.36 grams.
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PLEASE HELP ASAP
(50 POINTS)
You have 400,000 atoms of a radioactive substance. After 2 half-lives have past, how
many atoms remain?
Remember that you cannot have a fraction of an atom, so round the answer to the
nearest whole number.
Answers
Answer:
If 2 half-lives have passed, it means that the radioactive substance has decayed twice, so the number of remaining atoms would be:
1st half-life: 400,000 / 2 = 200,000 atoms remaining
2nd half-life: 200,000 / 2 = 100,000 atoms remaining
Therefore, after 2 half-lives have passed, 100,000 atoms would remain, rounded to the nearest whole number
Explanation:
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Which of the following is an example of climate?
A. The polar regions have long winters and short, cool summers.
B. Humidity levels are high today.
C. Canada experienced an unusually warm summer this year.
D. Tornados formed across Oklahoma yesterday.
Answers
Answer:
A. The polar regions have long winters and short, cool summers.
Explanation:
Climate is location based, however is over long periods of time, so Canada would not be considered because it is only 1 summer
Exchange of waste material, oxygen, carbon dioxide, and
metabolites such as salts and food molecules takes place in the
a. capillaries.
b. venules.
c. arterioles.
d. arteries.
Answers
The right answer is capillaries that metabolites like salts and food molecules are exchanged in capillaries together with waste products, oxygen, and carbon dioxide.
Where does the exchange of food and garbage take place?In the capillaries, waste, nutrients, and gases are delivered from the blood to the tissue. Little blood arteries called capillaries create networks surrounding body cells by branching off from arterioles.
Which occurs first, gas exchange in arteries or veins?It is supplied to the blood during gas exchange from the lungs. Both the lungs and blood exchange carbon dioxide at the same time. The capillaries, a network of tiny blood veins found in the walls of the alveoli, are where this occurs in the lungs in between the individual alveoli.
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13. Which of the following chemical reactions is an oxidation-reduction reaction?
A. C02 + H20 - H2C03
B. Pb(N03)2 + 2HC1- PbCh + 2HN03
C. H2S04 + Ba(OH)2 - BaS04 + 2H20
D. NH3 + HCl - NH4CI
E. Mg + CO2 - MgO + CO
Answers
Mg + CO\(_2\)→ MgO + CO is an oxidation-reduction reaction. Therefore, the correct option is option E among all the given options.
Redox reactions involve oxidation-reduction chemical processes in which the oxidation states of the reactants change. Redox is a shortened version of reduction-oxidation. Two distinct processes—a reduction process or an oxidation process—can be used to describe all redox reactions.
In redox and oxidation-reduction processes, the oxidation or reduction reactions usually take place concurrently. In a chemical reaction, the material that is being reduced is referred to as the reducing agent, and the substance that is being oxidised is the oxidising agent. Mg + CO\(_2\)→ MgO + CO is an oxidation-reduction reaction.
Therefore, the correct option is option E.
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16.45 centimeter = decameter
Answers
Answer: 0.01645
Explanation:to long tosovles.
A Brainliest please
Good luck .
Question 20 of 30
Which of the following would most likely be reduced when combined with
Al(s)?
Click for a reduction potential chart
OA. H+
B. K+
OC. Fe
D lit
Answers
D, Li. When combined with Al(s), Li+ is more likely to be reduced.
To determine which of the given options would most likely be reduced when combined with Al(s), we can refer to the reduction potential chart. The reduction potential indicates the tendency of a species to gain electrons and undergo reduction.
From the options provided:
A. H+
B. K+
C. Fe
D. Li
Based on the standard reduction potential chart, we can compare the reduction potentials of these species to that of Al. The species with a higher reduction potential than Al is more likely to be reduced.
According to the chart, the reduction potential of Al is -1.66 V. Comparing this to the options:
A. H+ has a reduction potential of 0.00 V.
B. K+ has a reduction potential of -2.92 V.
C. Fe has a reduction potential of -0.44 V.
D. Li has a reduction potential of -3.04 V.
Among the options, the species with the highest reduction potential is Li, with a value of -3.04 V. This means that Li+ has a greater tendency to be reduced compared to Al.
Therefore, the correct answer is option D, Li. When combined with Al(s), Li+ is more likely to be reduced.
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Reflect on the learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis”. Describe some similarities and differences between a question that comes in response to an observation, and a scientific research question? Cite quotes from the readings to support your answer. Where do variables fit into this thinking? In other words, if you imagine a number line with observation questions at one end and scientific research questions at the other, what role do variables play anywhere along this continuum?
Answers
The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.
The following quotes from the readings illustrate this distinction:"A scientific question is one that can be answered by using scientific investigation. In contrast, an observation question is one that comes in response to observing or experiencing something in the natural world" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."An important feature of a scientific question is that it should be answerable within a reasonable amount of time and with the resources available" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Research questions can be narrow or broad, depending on the scope of the research" (Constructing a Hypothesis).The concept of variables is crucial to both observation and scientific research questions, but they play different roles depending on where they fall on the continuum. Observation questions are usually less precise and may not require much consideration of variables. On the other hand, scientific research questions are likely to include a rigorous examination of variables and their potential effects."Variables are an essential part of a scientific experiment. They are the things that change in an experiment" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Variables are important because they can affect the outcome of the research" (Constructing a Hypothesis).In summary, observation questions and scientific research questions share some similarities, but the latter is more specific, has a defined methodology, and may require more consideration of variables.For such more question on Hypothesis
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A runner runs for a distance of 350 yards and then runs for an additional 200 m. What is the total difference covered by the runner in meters?
Answers
If you convert 350 yards to meters, you get 320.04.
320.04m + 200m = 520.04m.
Take off the .04 if necessary:)
Use the sideways T method or the table method below to show your work.
Convert 1 foot to kilometers.
Use the following conversions ratios. 1 foot = 12 inches. 1 inch = 0.0254 meters. 1000 meters = 1 kilometer.
please show your work
Will give brainlest
Answers
According to above Information
1 foot = 12 inches 12 inches = 12 × 0.0254 = 0.3048 meters 0.3048 meters = 0.3048 ÷ 1000 = 0.0003048 kmtherefore, there is a total of 0.0003048 Kilometers in 1 inch.
Answer:
there are 0.0003048km in 1 inch
Explanation:
hope it's helpful to you ☺️
1. What do you call the continuous change in position of a body relative to a pon
reference point, as measured by a particular observer in a particular frame
of reference?
Answers
Answer:
In physics, motion means a continuous change in the position of a body relative to a reference point, as measured by a particular observer in a particular frame of reference.
Explanation:
Incorrect
Question 8
0/5 pts
(03.03 MC)
The diagram below represents a convection cell. The arrows
indicate the direction of air flow:
Need HELP HURRY
Answers
why is it important to record all accidents and breakages that occur in the laboratory
Answers
It is important to record all accidents and breakages that occur in the laboratory to prevent them from happening again.
What is laboratory accident?Laboratory accident is defined as the type of accident that occurs in the laboratory leading to harm.
Example of laboratory accidents include the following:
chemical burns, cuts from broken glass, inhalation of toxic fumes, absorption of chemicals through the skin, and ingestion of toxic chemicals.A record of these type of laboratory accidents would hel prevent it's reoccurrence.
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Photoelectric effect will occur only if frequency of light striking an electron in a metal is above a certain threshold frequenci
Answers
The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.
The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.
The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.
This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.
Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.
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NEED HELP ON QUESTION ASAP! !
If answer is correct I'll rate you five stars a thanks and maybe even brainliest!
Please can you explain what this paragraph is trying to say. Also what does it mean in the sentence 'the difference in charge across the battery provides push for current' and what is the difference in charge.
Here's paragraph I need to have a simple definition of:
A high waterfall is also like a large voltage. It will transfer a lot of energy to the water (charge), making the river flow very fast (a large current) the difference in height makes the river flow. In a circuit , the difference in charge across battery provides push for the current.
Answers
A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.
Thus, Many waterfalls are transient and only occur during rainstorms because of their location in the landscape, where they are often over bedrock and fed by a small contributing region.
For general knowledge, we are listing the "Top 10 Highest Waterfalls in India" here. The Kunchikal Falls are the second-highest waterfall in Asia and the highest in all of India.
The waterfall, which is close to Agumbe in Karnataka's Shimoga district, has a height of 1,493 feet. The Varahi River creates the biggest waterfall. The sole permanent rain forest research is located in Agumbe Valley, one of India's most heavily rained-on regions.
Thus, A waterfall is a river's water falling rapidly to the ground. It is created in a river's upper course where there are high mountains.
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A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown. Which of the following characteristics can be written only in space C?
Answers
Covalent and ionic bonds refer to atoms joined by their electrons. In covalent bonds, electrons are shared by the involved non-metal atoms. Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms.
What are covalent and ionic bonds?
Both of them, covalent and ionic bonds, are chemical bonds that can form between atoms.
Ionic bonds occur between atoms with different electronegativity. When they bind, they transfer electrons from one atom to the other creating ions with opposite charges that attract each other.
Ionic compounds are formed by anions and cations.
• Cations are positive ions derivated from metals.
• Anions are negative ions derivated from non-metals.
The metal atoms share its electrons with the non-metal ones, creating stable configurations. Ionic bonds do not create molecules.
Covalent bonds are formed between atoms share electrons to be more stable. Atoms involved share electrons equally, creating a strong bond between them.
Covalent bonds are usually formed between non-metal atoms.
Option 2 is correct. Occurs due to the sharing of electrons between two non-metal atoms
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Complete question
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space C?
On the diagram,
The non-overlapping space on the left is marked A, and belongs to the IONIC BOND side of the diagram.The overlapping space is marked B The non-overlapping space on the right is marked C, and belongs to the COVALENT BOND side of the diagram.Options,
Formed between positively and negatively charged ionsOccurs due to the sharing of electrons between two non-metal atomsOccurs in substances that are mostly solids at normal temperature and pressureFormed between an atom with very high electronegativity and an atom with very low electronegativityAqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 14. g of hydrochloric acid is mixed with 6.55 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Round your answer to significant digits.
Answers
Answer:
8.02 g of HCl could be left over by the chemical reaction
Explanation:
We propose the reaction:
HCl(aq) + NaOH (s) → NaCl (aq) + H₂O (l)
Ratio is 1:1. First of all, we determine the moles of reactants:
14 g . 1mol / 36.45g = 0.384 mol of acid
6.55 g. 1mol / 40g = 0.164 mol of base
If a determined mass of HCl, could be left; this means that the acid is the excess reagent.
For 0.164 moles of NaOH, we need 0.164 moles of HCl.
As we have 0.384 moles, (0.384 - 0.164) = 0.220 moles of acid are left over in the reaction. We convert the moles to mass:
0.220 mol . 36.45 g /1mol = 8.02 g
Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
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Why are the united nation members upset with Wakanda?
Answers
The "Wakanda speech," six weeks have passed, and the world is still in shock.
Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.
The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.
The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.
Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.
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how does a buffer work?
A. it prevents added acids or bases from dissociating
B. it neutralizes acids or bases by precipitating a salt
C. it forms new conjugate pairs with the added ions
D. it bonds with the added H+ or OH- in solution
Answers
Answer:
It bonds with the added H+ or OH in solution.
Explanation:
Define biotechnology. } List two advantages in the use of biotechnology
Answers
Advantages of biotechnology:
Improvement of plants and animal breeds to give a high yield of their products.
Pests and pathogen control in agriculture which will reduce the loss of yield in food crops.
Synthesis of biocatalyst which can be used for enhancing the reactions which can be carried out in vitro or laboratory conditions.
Sewage treatment or water recycling can be done with the help of transgenic microbes which have better efficiency and speed.
Biotechnology is the use of living organisms or other biological systems in the manufacture of drugs or other products or for environmental management, as in waste recycling: includes the use of bioreactors in manufacturing, microorganisms to degrade oil slicks or organic waste, genetically engineered bacteria to produce human hormones, and monoclonal antibodies to identify antigens.
Biotech offers the possibility of improving human health, the environment, and agriculture while creating more sustainable modes of production.
What is the only way to confirm that a chemical change has taken place?
O A. You can observe a color change.
B. You can see that the mass of material has changed.
C. You can record a temperature change.
D. You can tell that a new substance has formed.
Answers
Write a balanced overall reaction given the unbalanced half‑reactions. Ca ⟶ Ca2+ Na+ ⟶ Na
Answers
Answer:
Ca + 2 Na+ + 2 e- ⟶ Ca2+ + 2 Na
Explanation:
The overall reaction is balanced by including the electrons that are transferred in the reaction. The balanced overall reaction is:
Ca + 2 Na+ + 2 e- ⟶ Ca2+ + 2 Na
This reaction shows the transfer of two electrons from calcium to sodium ions, which results in the formation of calcium ions and sodium atoms. This reaction is electrically neutral, with the same number of positive and negative charges on each side of the reaction. Overall, the reaction represents the transfer of electrons from one element to another, resulting in the formation of new chemical species.
How many grams of iron are needed to produce 3 g of iron(III) chloride?
Answers
Answer:
5 its just what i do
Explanation:
3. Many phones have batteries made of lithium. Why do
you think engineers decided to use lithium to make
these batteries?
Answers
Answer:
Yes I have a solutions
Explanation:
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Calculate the mass of water produced when 5.53 g of butane reacts with excess oxygen
Answers
The mass of water produced is 17.097 g.
What is mass?
Mass is a scalar quantity that represents the amount of matter in an object. It is typically measured in units of grams (g) or kilograms (kg). The mass of an object is different from its weight, which is the force exerted on an object due to gravity.
The mass of an object remains constant regardless of its location, while its weight changes depending on the gravitational pull at that location. The kilogram is the base unit of mass in the International System of Units (SI).
The balanced equation for the combustion of butane (C4H10) is:
C4H10 + 13O2 -> 4CO2 + 10H2O
To find the mass of water produced, we need to know the number of moles of butane used in the reaction.
We can use the formula mass of butane, which is 58.12 g/mol, to convert the mass of butane to moles.
5.53 g of butane is equal to:
5.53 g / 58.12 g/mol = 0.095 moles
Since the reaction is given as being with excess oxygen, we only need to consider the number of moles of butane.
The number of moles of water produced is then:
0.095 mol x 10 mol/1 mol of butane = 0.95 mol
To find the mass of water produced, we can convert the number of moles to mass using the molar mass of water, which is 18.02 g/mol
0.95 mol x 18.02 g/mol = 17.097 g of water is produced.
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The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction.
a. True
b. False
Answers
Answer:
True
Explanation:
In a cell reaction, half cell reaction is oxidation. Oxidation means addition of electrons. This addition of electrons takes place at cathode. Therefore, cathode is site of oxidation. However, the other half cell reaction is reduction. In reduction reaction removal of electrons takes place. Reduction takes place at anode of the cell.
Therefore, the given statement is true.
HELLP ME PLSSS
The passing of heat through a material is called ________.
A. vibration
B. conduction
C. radiation
D. convectio
Answers
Answer:
B
Explanation:
conduction is the transfer of heat between objects that touch