Based on the balanced chemical equation, the volume of 0.250 M K₂S₂O₃ (aq) needed to completely react with 37.32 mL of 0.125 M KI₃ (aq) is 37.32 mL.
What is the balanced equation for the reaction of K₂S₂O₃ (aq) and KI₃ (aq)?The reaction between K₂S₂O₃ (aq) and KI₃ (aq) is a redox reaction.
The balanced chemical equation of the reaction is given as follows:
2 S₂O₃²⁻ (aq) + I₃⁻ (aq) ---> S₄O₆²⁻ (aq) + 3 I⁻ (aq)
Based on the balanced equation of the reaction:
2 moles of K₂S₂O₃ (aq) are required to react with one mole KI₃ (aq).
Moles of KI₃ (aq) in 37.32 mL of 0.125 M solution;
moles = molarity * volumeMoles of KI₃ (aq) = 37.32 * 0.125 M
Moles of KI₃ (aq) = 4.665 mmoles
Moles of K₂S₂O₃ (aq) required = 2 * 4.665 mmoles
Moles of K₂S₂O₃ (aq) required = 9.33 mmoles
Volume of K₂S₂O₃ (aq) required =moles / molarity
The volume of K₂S₂O₃ (aq) required = 9.33 / 0.25
The volume of K₂S₂O₃ (aq) required = 37.32 mL
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need help asap. Just answer the question in the picture
What are the top three sources of U.S. electricity generation? Estimate the overall efficiency of U.S. electricity generation. How does this compare to the efficiency for transportation?
For electricity generation, the three major parts of energy are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable power sources.
How is electricity generated in the United States?According to the US Energy Information Administration, natural gas, nuclear energy, and coal will generate the majority of the country's electricity in 2020. Renewable energy sources such as wind, hydropower, solar power, biomass, wind, and geothermal are also used to generate electricity. In contrast to the use of fossil fuels, renewable electricity generation in the United States has increased in recent years, reaching nearly 800 terawatt hours in 2020. Natural gas, solar, and wind power continue to be the dominant forms of new generation capacity, accounting for 99.74% of all capacity additions in 2021 and 98% of capacity additions in 2022. Solar capacity has increased dramatically, with over 25,000 MW added since 2020, representing a 60% increase.To learn more about U.S. electricity generation, refer to:
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Name one hobby and/or career in which it would be important for people to understand the gas laws. Explain why it is important to that hobby/career.
One career in which it would be important for people to understand the gas laws is chemist.
Who is a chemist?A chemist is a person who specializes in the science of chemistry, especially at a professional level.
The gas laws are an integral component of chemistry as a subject or course of study. The fundamental gas laws in chemistry are as follows;
Boyle's Law Gay- Lussac Law Avogadro's LawIdeal Gas Law: PV = nRTThese laws explain the interaction of an ideal gas, which is a gas whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.
Therefore, being a chemist as a career path means understanding the gas laws.
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why is oxygen used in the production of raw copper?
Oxygen is used in the production of raw copper because it is a catalyst for the reaction that turns alumina into pure copper.
Alumina is an ore, and it is a refractory metal. Alumina has three components: aluminum oxide (Al2O3), silica (SiO2), and water. When this ore is heated, the aluminum oxide breaks down into smaller pieces of aluminum and oxygen gas.
When this process happens, these gases react with each other to produce pure oxygen gas. The reaction between the gases also produces heat, which causes more alumina to break down from its original form.
The oxygen produced by this reaction can be used as a catalyst for turning alumina into pure copper at high temperatures.
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How much heat does it take to raise the
temperature of 225 g of water from 25.0°C to 100.0°C?
Answer:
7.06 x 10⁴ J
Explanation:
To find the amount of heat necessary to heat the water, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = change in temperature
The specific heat capacity of water is 4.186 J/g°C. You can plug the given values into the equation and simplify to find "Q".
Q = ? J c = 4.186 J/g°C
m = 225 g ΔT = 100.0°C - 25.0°C = 75.0°C
Q = mcΔT <----- Given equation
Q = (225 g)(4.186 J/g°C)(75.0°C) <----- Insert values
Q = 7.06 x 10⁴ J <----- Multiply
Why doesn’t the brain return back to normal as soon as someone stops taking drugs
The brain does not return to normal as soon as someone stops taking drugs because brain receptors become overwhelmed. Dopamine synthesis is reduced or dopamine receptors are eliminated in the brain.
Why does this happen?Endorphins, which are natural opioids produced by your body, are used to block pain signals.
Peripheral/nociceptive pain is associated with injuries that harm your skin and muscles, such as pinpricks and stove burns.
Pain fibers detect these wounds and transmit the signal to the neurons in your spine and brain, the two structures that make up your central nervous system.
Your pain fibers and central nervous system normally cooperate in a condition. Your brain says "ow" and instructs your body how to respond when someone punches you. Release of stress-relieving chemicals. Your immune system combats the swelling in your injured arm.
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A student placed a sample of a food coloring that contains a mixture of a blue dye and a red dye at the top of a chromatography column filled with a nonpolar stationary phase. When water is poured through the column, two bands of colors are seen in the column, as shown in the diagram above.
A student collects a sample of the blue dye from the column in a cuvette. Which of the following is least useful to determine the concentration of the sample using a spectrophotometer set at 640nm?
A. The volume of a sample
B. The path length of the cuvette
C. The absorbance of the dye at 640nm
D. The solar absorptivity of the dye at 640nm
Based on the principles of spectrophotometry, the least useful to determine the concentration of the sample using a spectrophotometer set at 640nm is: the volume of a sample; option A.
What is spectrophotometry?Spectrophotometry is an analytical technique that is used to measure the concentration of a solution by measuring how much light the solution absorbs or transmits when a beam of light of a given wavelength is passed through it.
In spectrophotometry, the concentration of a solution is directly proportional to its absorptivity. This implies that the higher the concentration of a solution, the higher the amount of light absorbed by the solution.
The absorptivity of the solution is inversely proportional to the transmissivity of the solution.
The higher the concentration, the lesser the amount of light the solution will transmit.
The factors that are important in calculating the concentration of a solution are:
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2. James throws a rock into a deep well with a velocity of 10.0 m/s [down]. What is the velocity of the rock 2.5 s
The velocity of the Rock is 34.5 m/s.
What is defined as velocity?The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.The pace at which a body's distance changes in relation to time is referred to as its velocity. Its SI equivalent is m/s.To learn more about : Velocity
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In the near-vacuum of space, bare metal surfaces on the International Space Station can reach temperatures above 260°C. Why?
A. The side of the station facing the sun receives thermal energy via electromagnetic radiation.
B. As the station travels through space, a few atoms per second impact the surfaces and transfer their energy to them via conduction.
C. The heat is transferred to the surfaces by convection as the station moves through the thin fluid of space.
D. The side of the station facing deep space absorbs thermal energy radiated from all the stars on that side.
In the International Space Station on near-vacuum space, the bare metal surfaces can reach temperatures above 260℃ as the side of the station facing the sun receives thermal energy via electromagnetic radiation (A).
Space is nearly vacuum i.e., it has no air in space. Conduction and convection of heat requires air. As space is nearly vacuum, conduction and convection of heat does not happen on bare metal surface on International Space Station.
The only mode of heat transfer in space is Radiation. The space station surface facing away from sun would be cold as the stars are far away from our solar system to heat them up. Thus, the side of the station facing the sun receives thermal energy via electromagnetic radiation.
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Assume you had a solution that contained a mixture of silver ions and strontium ions. Come up with two different reaction plans that would allow you to precipitate either the silver ion or strontium ion, but the other ion would remain in solution.
Answer:
Explanation:
By creating complex ions, altering the solution's pH, or raising the temperature to redissolve part of the solids, metal ions that precipitate together can be separated using a variety of different methods.
Convert 528 ft/min to ft/sec.
One foot equals 60 feet per minute if the conversion factor is 60. The 528ft/min will be 8.8ft/sec.
How many feet per minute does one foot per second equal?One foot equals 60 feet per minute if the is 60.
How quickly does light move per second?To convert speed to miles per hour, multiply the speed in feet per second by 0.681818. You could, for example, convert 5 feet per second to miles per hour using the method shown above. Miles per hour and feet per second are used to measure speed. Continue reading to learn more about each unit of measurement.
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In order for radiation to transfer heat,
electromagnetic waves must be transmitted
objects must be in direct physical contact
particles must circulate and move in a liquid or gas
thermal energy must move from cold to hot objects
To transfer heat in radiation electromagnetic waves must be transmitted.
Heat transfer occurs through conduction, convection and radiation.
Conduction requires direct physical contact whereas in convection the particles must circulate and move in a liquid or gas. Both of the transfer heat only in the presence of air.
Radiation is a type of heat transfer that occurs everywhere through electromagnetic waves. In radiation, electromagnetic waves must be transmitted for the transfer of heat. It happens even in vacuum.
Every object radiates thermal energy. Even humans radiate heat at all times. It does not have to move from cold to hot objects.
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Express the answer to the following calculation with the correct number of significant figures.
-Don't put it into Scientific notation.
Type in a unit - use the symbol/abbreviation (g, not grams)
147.6mm − 0.82mm = _____ in units of ____
The value of the difference of 147.6 mm and 0.82 mm is equal to 146.78 in units of mm.
What is scientific notation?Scientific notation is a method of expressing numbers that are too large or too small to be conveniently written in decimal form. The scientific notation may be referred to as standard index form or scientific form.
This base ten notation is generally used by mathematicians, scientists, and engineers. The scientific notation of nonzero numbers can be written in the form [tex]m \times10^n[/tex] or 'm' times 10 raised to the power of n, where n is an integer.
To calculate the difference of 147.6 mm and 0.82 mm:
147.6mm − 0.82mm = 146.78 in the units of mm
As we know one millimeter is equal to 10⁻³ meters. As mentioned in the question, keep the unit 'mm' which is a millimeter.
Therefore, 147.6mm − 0.82mm = 146.78 in units of mm.
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How many grams are there in 7.4 x 1023 formula units of AgNO3?
Data we are collecting from the equation as:
7.4x10^23 = silver nitrate molecules as given in the question.
As we know Avogadro's no. 6.022*1023 which is a number of molecules.
So when we calculate any no. Of the mole of any atom we know that 1mole of any atom is equal to Avogadro's no and grams can be calculated from the mole's equation.
So back to the point,
Dividing molecules of AgNO3 to no. of molecules per mol of AgNO3
7.4 / 6.02*1023
= 1.229*1023per mole of AgNO3.
OK we get the moles of AgNO3
Now checking the gram of AgNO3
The weight of AgNO3 is 163.868.
Now multiplying both values moles*molar weight of AgNO3
1.229*1023 * 763.868 = 208.767grams of AgNo3
I need help identifying the bonds in each molecule as a polar or nonplolar
Polar molecule : [tex]NH_{3} , HF, H_{2}O, CH_{3}F.[/tex]
Non Polar Molecules : [tex]CH_{4}, BeCl_2[/tex]
What is the difference of nonpolar and Polar Molecules?We refer to something as being polar when it differs at either end. Some molecules also contain positive and negative ends; these are known as polar molecules. Polar objects can both attract and repel one another (opposite charges attract, alike charges repel).It is frequently helpful to look at Lewis structures to establish whether a molecule is polar or nonpolar. Nonpolar compounds are said to be symmetric, which means that all of the sides surrounding the core atom are the same and bound to the same element without any unshared pairs of electrons.To learn more about : Lewis structures
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Sodium only has one naturally occuring isotope, Na23 , with a relative atomic mass of 22.9898 u. A synthetic, radioactive isotope of sodium, Na22 , is used in positron emission tomography. Na22 has a relative atomic mass of 21.9944 u.
A 2.4698 g sample of sodium containing a mixture of Na23 and Na22 has an apparent "atomic mass" of 22.9551 u . Find the mass of Na22 contained in this sample.
Based on the given relative atomic masses of the isotopes, the mass of Na-22 contained in this sample is 0.086 g.
What is the relative atomic mass of an element?The relative atomic mass of an element is the average mass of one mole of an atom of an element calculated from the atomic masses of the atoms of an element and their relative abundances.
relative atomic mass of an element = sum of atomic mass * relative abundance of each isotope.Isotopes of elements are atoms of an element that differ from each other by their masses. The difference in the mass of the isotopes is a result of the difference in the number of neutrons contained within the nucleus of the atoms of the isotopes.
Considering the naturally occurring sodium isotope, Na-23, and the synthetic, radioactive isotope of sodium, Na-22:
the relative atomic mass of Na-23 = 22.9898 u
the relative atomic mass of Na-22 = 21.9944 u.
mass of sample = 2.4698 g
the apparent atomic mass of the isotope = 22.9551 u
Sum of the relative abundances = 1
Let relative abundance of Na-22 = x
relative abundance of Na-22 = 1 - x
22.9898 * (1 - x) + 21.9944 * x = 22.9551
22.9898 - 22.9898x + 21.9944x = 22.9551
0.9954x = 0.0347
x = 0.035
Mass of Na-22 in the sample = 2.4698 * 0.035
Mass of Na-22 in the sample = 0.086 g
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situation
A strip of solid lead metal
is put into a beaker of
0.045M Sn(NO3)2 solution.
A strip of solid tin metal is
put into a beaker of
0.092M Pb(NO3)2 solution.
che
rea
From the reactivity order, we can see that Tin is more reactive than lead. Hence Tin can replace lead from its salt through the strip of solid lead metal.
What is the reactivity series?A chart listing metals in decreasing order of reactivity is called the metals reactivity series.
A metal generally reacts with other chemicals more forcefully the more reactive it is. The easier it is for positive ions to form when losing electrons (cations).
An empirical, calculated, and structurally analytical progression of a group of metals, grouped in order of their "reactivity" from highest to lowest, is known as a "reactivity series" in chemistry.
The equations can be stated as
Pb(s) + Sn[tex](NO_{3})_2[/tex] (aq) → no reaction
Sn (s) + Pb [tex](NO_{3})_2[/tex] → reaction occurs
The final reaction can be stated as
Sn (s) + Pb [tex](NO_{3})_2[/tex] (aq) → Sn[tex](NO_{3})_2[/tex] (aq) + Pb(s)
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Complete Question
A strip of solid lead metal is put into a beaker of 0.045M Sn(NO3)2 solution.
A strip of solid tin metal is put into a beaker of 0.092M Pb(NO3)2 solution.
Provide the complete chemical reaction for the two statements.
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
The electrical charge of the nucleus of an atom is +12 then 12 electrons does the atom have in its neutral state
Basic property of matter carried by some elementary particles that governs how the particles are affected by an electric or magnetic field and when a neutral atom gains or loses electrons, it becomes an ion and heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons and so an atom as a whole is electrically neutral
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A scientist wants to test the effects of different potassium chloride, KCI, solution concentrations. Potassium chloride is sometimes used to treat conditions that result from potassium depletion, such as cardiac or kidney disease. The scientist dissolves 255 g KCI to make a 3.20 L solution. Use the space provided to calculate the molarity of the potassium chloride solution.
According to the given statement the molarity of the potassium chloride solution is 1068.75 moles KCL .
What do molarity mean?The molarity of a material refers to the amount of it that is present in a given solution volume (M). Molarity is indeed the measure of how many moles of a solute are contained per liter of a solution. It is commonly referred to as the molar concentration of the solution.
Briefing:To find the number of moles of potassium chloride, your solute, use the compound's molar mass, the mass of one mole of potassium chloride
1 mole of KCl = 74.55 g
255 g/1mole of KCL
255g / 74.55g
=3.420 g
Molarity is expressed per liter of solution. Since you dissolve 3.420 moles of potassium chloride in 3.20 mL of solution, that 1.0 L will contain
[tex]$1.0 \mathrm{~L} \cdot \frac{10^3 \mathrm{mL}}{1L} \cdot \frac{3.420\mathrm{moles}}{3.20 \mathrm{mL}}$[/tex] = 1068.75 moles KCL
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How many iron atoms in 2.35 mol of Fe?
Answer:
6.022 X 1023 atoms
Explanation:
How will you apply the concept of biology,chemistry, and homeostasis in your future career
My ability to interconnect my understanding in biology, chemistry and homeostasis makes me a great scientist as I will apply all these in my future career by:
Making sure I feed on a healthy balance diet.Separating mixtures of insoluble solids from solutions by way of filtration.Recognizing my response to certain dangerous situation when the emergency hormones are released.What is meant by an emergency hormones?These are the hormones which are released when we suddenly find ourselves in a dangerous or life threatening situation such as we need manage risk or prevent accident. This hormone is known as adrenaline. They are known as flight or fight hormones.
So therefore, the knowledge I acquired from biology, chemistry and homeostasis will used to make my career more productive in the nearest future.
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What is the relationship among force, mass, and acceleration? (1 point)
O Force equals mass divided by acceleration.
O Force equals mass times acceleration.
O Force equals mass minus acceleration.
O Force equals mass plus acceleration.
The relationship among force, mass, and acceleration is force equals mass times acceleration. Therefore, option B is correct.
What is an acceleration ?The term acceleration is defined as the rate of change of velocity. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.
The application of a net force to an object alters its motion, the greater the net force, the greater the acceleration. More massive objects necessitate greater net forces to accelerate at the same rate as less massive objects.
“Force equals mass times acceleration.” This is because this shows the equation for force, and thus it shows the relationship between them in how they are used.
Thus, option B is correct.
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Calculate the mass of iron(III) oxide (Fe₂O3) that contains a billion (1.0 × 10^9) oxygen atoms.
Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.
The balanced chemical equation for rusting iron is:
4Fe + 3O2 = 2Fe2O3
If we divide 1.0x10^9 by Avogadro's number, we get the amount of moles of oxygen which is 1.6611x10^-15 moles.
From the chemical equation we know that it takes 3 moles of oxygen to produce 2 moles of iron oxide. So if we multiply the moles of oxygen calculated by 2/3, we can get the moles of iron oxide.
(1.611x10^-15)(2/3) = 1.107419x10^-15 moles of iron oxide.
If we multiply the moles of iron oxide by the molar mass of iron oxide, we get how many grams of iron oxide would be produced by 1 billion oxygen atoms. Which is the same thing as how many grams of iron oxide contain 1 billion oxygen atoms.
(1.107419x10^-15)(159.69) = 1.8x10^-13 grams of Fe2O3
4.50 How many grams of iron(III) sulfide form when 62.0 mL of 0.135 M
iron(III) chloride reacts with 45.0 mL of 0.285 M calcium sulfide?
Answer:
[tex]\small\color{black}\boxed{\colorbox{green}{√ Verified Answer}}[/tex]
A compound is defined as a pure substance that is made up of two or more elements in a fixed ratio by mass.
A molecule is the smallest part of an element or a compound that can exist independently.
is a compound called Calcium sulphide. It is formed by the chemical combination of calcium and sulphur . It represents one molecule of the compound. Each molecule of this solid contains one atom of calcium combined with one atom of sulphur.
..
What is the net ionic equation for Fe(NO3)3+3NaOH=Fe(OH)3+3NaNO3
The three rules for writing net ionic equations are actually quite simple. Consider only breaking up the (aq) substances. Only strong electrolytes should be broken up. Any ions that appear on both sides of the equation should be removed.
What exactly is a net ionic equation?A net ionic equation is defined as an equation that depicts only the molecules or ions that are actively involved in the reaction or those that change. The spectator ions are not present in this equation. First, write and balance the molecular equation, ensuring that all formulas are correct. Then, using all aqueous substances as ions, write the ionic equation. Carry any coefficients through. Finally, remove spectator ions from the equation and write the net ionic equation. The purpose of writing a chemical equation is to express what we believe is going on in a chemical reaction. One of the most useful applications of the principal species concept is in the formulation of net ionic equations.To learn more about net ionic equation, refer to:
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Which elements can form more than one type of ion?
is the soap solution acid how would you verify it
Answer:
Yes, soap solution is acidic. You verify its acidity by using a red litmus paper.
Explanation:
The soap is a weakly acidic. To verify that the soap solution is acidic, put a drop of soap solution on a red litmus paper, color change will be observed and the red litmus paper will turn into blue. This gives us the evidence that soaps are acidic.
Calculate the average atomic mass of rubidium. Rubidium has two isotopes, 85Rb and 87Rb. 85Rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17%. 87Rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83%.
The average atomic mass of rubidium is 85.466 amu.
For calculating the average atomic mass of the Rb, the atomic masses for both isotopes are taken into consideration.
The [tex]^{85}{Rb[/tex] has atomic mass = 84.912 amu
The abundance of [tex]^{85}{Rb[/tex] = 72.17 %
The average atomic mass of [tex]^{85}{Rb[/tex] = 72.17 %
The average atomic mass of [tex]^{85}{Rb[/tex] =[tex]84.912\times\frac{72.17}{100}[/tex]
= 61.28 amu
The [tex]^{85}{Rb[/tex] has atomic mass = 86.909 amu
The abundance of [tex]^{85}{Rb[/tex] = 27.83%
The average atomic mass of [tex]^{85}{Rb[/tex] = [tex]86.909 \times \frac{27.83}{100}[/tex]
= 24.186 amu
The average atomic mass of Rb will be = [tex]^{85}{Rb+ ^{87} Rb[/tex]
= 61.28 + 24.186 amu
= 85.466 amu.
The average atomic mass of rubidium is 85.466 amu.
What are isotopes?Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons) due to differences in the total number of neutrons in their nuclei.
The three isotopes of hydrogen
Protium or hydrogen-1. This isotope of hydrogen contains 1 proton, 1 electron and no neutrons. Deuterium or hydrogen-2. This isotope of hydrogen contains 1 proton, 1 electron and 1 neutron. Tritium or hydrogen-3. This isotope of hydrogen contains 1 proton, 1 electron and 2 neutrons. It can also be argued that this isotope of hydrogen is radioactiveTo learn more about isotopes, refer;
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I need help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
There was distilled water in the cuvette when the student put the standard solution in it.
The correct option is A.
What is the use of concentration of solution?The concentration of a solution can be used to determine how much solute has been dissolved in a given quantity of liquid or solution. A concentrated solution is one that has a large concentration of the dissolved solute. If there is only a small amount of dissolved solute in the solution, it is said to be dilute.
Why is it important to understand the concentration of the solutions ?In chemistry, a solution's concentration refers to the proportion of a solute that is present in a given amount of solvent or solution. Understanding the solute concentration is necessary for controlling the stoichiometry of reactants in solution reactions.
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The complete question is -
A student uses visible spectrophotometry to determine the concentration of CoCl₂ (aq) in a sample solution. First the student prepares a set of CoCl₂ ( aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The student made the standard curve above. Which of the following most likely caused the error in the point the student plotted at 0.050 M Co²⁺(aq)?
A-There was distilled water in the cuvette when the student put the standard solution in it.
B-There were a few drops of the 0.100 M Co²⁺(aq) standard solution in the cuvette when the student put the 0.050 M standard solution in it.
C-The student used a cuvette with a longer path length than the cuvette used for the other standard solutions.
D-The student did not run a blank between the 0.050 M Co²⁺(aq) solution and the one before it.
EASY CHEMISTRY QUESTIONS FOR 100 POINTS
Answer:
Can't decide, Can't decide, and mixture.
Hopefully this is right. Technically you also can't decide on C but the chances of it being a pure substance are very low.
Explanation:
Technically, you can't decide on any of them since you have no idea of the actual compositions. Even if the ratio of the elements in grams are the same, there is no guarantee that the elements are chemically combined. For example, if you are given the info that a box contains 1 gram of hydrogen and 8 grams of oxygen, it could contain 9 grams of water, or 1 gram of hydrogen gas and 8 grams of oxygen gas. Knowing that water contains 1 gram of hydrogen and 8 grams of oxygen per 9 grams of oxygen doesn't help you determine if a container with 2 grams of hydrogen and 8 grams of oxygen has hydrogen peroxide or just a mix of the two gasses.
For A, it could be a pure substance since the ratio of E1 to E2 is twice the ratio of E1 to E2 in substance X. You can't really decide though
For B, it could be a pure substance since the ratio of E1 to E2 is four times the ratio of E1 to E2 in substance X. You can't really decide though
For C, It is very likely to be a mixture, since the ratio of E1 to E2 in substance C is 2.7 times that of the ratio of E1 to E2 in substance X