According to the balanced chemical equation, 2 moles of potassium permanganate produces 5 moles or oxidizes 5 moles of sulphite to sulphate ions. As a result, there are 0.639 moles of potassium.
In alkaline solution, KMnO4 reduces to green K₂MnO₄: 4 KMnO₄ + 4 KOH 4 K₂MnO₄ + O₂ + 2 H₂O. This reaction exemplifies hydroxide's uncommon role as a reducing agent. Mn₂O₇ is formed when concentrated sulfuric acid is added to potassium permanganate. One mole of KMnO₄ requires 5 moles of electrons in an acidic medium. Multiply equation (1) by 5 and equation (2) by 3 to balance the number of electrons. In an acidic medium, five moles of ferrous oxalate are oxidized by three moles of KMnO₄.
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what is the result of applying too much sample to the tlc plate? select one: the sample leeches out into the elution solvent reduced separation between the spots some of the sample moves down instead of up the spot does not leave the origin the sample moves past the solvent front
Applying too much sample to the TLC (thin layer chromatography) plate results in reduced separation between the spots.
When performing thin layer chromatography it is necessary to not apply too much of the sample onto the plate. Once the elution solvent starts climbing up the plate, all the components of the sample will be separated along the plate according to the intensity of their interactions with the plate and the solvent (quantified as the Rf value - retention factor).
In a sample that is too concentrated or too much of it has been applied, the separation will be negatively affected because the huge spots originating from the sample components will overlap, making Rf determination difficult, if not impossible.
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what is the ph of a strontium hydroxide solution obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution? insert your answer in decimal notation, rounded to 2 decimal digits.
The pH of a strontium hydroxide was obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution is 3.6.
What is pH?The range of pH goes from 0 to 14, with 7 acting as neutral. A pH value of 7 or less denotes acidity, while a pH value of 7 or more denotes baseness. The amount of free hydrogen and hydroxyl ions present in the solution is what determines the pH of water.
Molarity of strontium hydroxide = mass/volume
Molarity of strontium hydroxide = 0.17/670
Molarity of strontium hydroxide = 0.000253 = 2.53 × 10⁻⁴
pH = - log [strontium hydroxide]
pH = -log [2.53 × 10⁻⁴]
pH = 3.59
pH = 3.6
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A substance made up of only one kind of atom is called
A substance made up of only one kind of atom is called Elements.
An element is a pure substance made up of only one kind of atom. A compound is substance made up some of more than one element. in some of the elements atoms are joined in groups of two or more called as molecule . example : oxygen is an element made up of only one kind of atom that is oxygen atoms. there are 118 known elements , and are represented on the periodic table.
Thus, A substance made up of only one kind of atom is called Elements.
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calculate the volume of concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will you need to neutralize the solution after the copper is completely dissolved?
The volume of Concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will need to neutralize completely dissolved is 0.704 ml
4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l)
According to net Ionic equation 4 moles of HNO3 reacts with 1 mole of Cu(s)
moles of Cu in 0.36 gm of Cu = 0.36/63.5
moles = molarity*volume(L)
moles of Cu*4 =moles of HNO3
Let volume of HNO3 be x
0.36/63.5*4 = 16*x
x = 1.42 ml
c. Volume of HNO3 added = 1.64 ml
excess of HNO3 = 1.64-1.42
= 0.22 ml
Normality of NaOH and HNO3 is same i.e. equal moles of NaOH and HNO3 neutralises itself
molarity of NaOH = 5 moles/litre
moles of NaOH = Moles Of HNO3
5*x = 16*0.22
x = 0.704 ml
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If mercury (ii) oxide is heated and decomposes, what would the product of the reaction be? 4hgo → 4 2o2
If mercury (ii) oxide is heated and decomposes, the product of the reaction be 4 Hg.
Mercury is a chemical element with the atomic number 80 and the symbol Hg. Formerly known as hydrargyrum and also known as quicksilver, In order to fragment anything into smaller pieces or to break it into smaller pieces, mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lights, and other devices: Methane and carbon dioxide are produced when microbes break down organic waste. staying fresh while decomposes The process of recycling nutrients that an organism (plant or animal) has utilized to develop its body begins with decomposes. It is the process by which the decomposing dead tissues transform into more basic organic forms. For a large number of the species at the base of ecosystems, these serve as a food supply.
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phenylacetic acid (c6h5ch2cooh) builds up in the blood of phenylketonurics. when left untreated, this can lead to intellectual disability, seizures, behavioral problems, and even death. a 0.12 m solution has a ph of 2.62. what is the ka of phenylacetic acid?
The [tex]K_{a}[/tex] of phenylacetic acid is 4.76008×[tex]10^{-5}[/tex], when the pH of the solution is 2.62.
As we know,
pH = -log[[tex]H^{+}[/tex]]
[[tex]H^{+}[/tex]] = [tex]10^{-pH}[/tex]
[[tex]H^{+}[/tex]] = [tex]10^{-2.62}[/tex]
[[tex]H^{+}[/tex]] = 2.39×[tex]10^{-3}[/tex]
Also to find [tex]K_{a}[/tex] of phenylacetic acid we know another relation as:
[[tex]H^{+}[/tex]] = [tex]\sqrt{K_{a} .c}[/tex]
2.39×[tex]10^{-3}[/tex] = [tex]\sqrt{K_{a} .0.12}[/tex]
[tex]K_{a}[/tex] = 4.76008×[tex]10^{-5}[/tex]
Therefore, the [tex]K_{a}[/tex] of phenylacetic acid is 4.76008×[tex]10^{-5}[/tex], when the pH of the solution is 2.62.
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which of the following statements is false? gas molecules collide with each other without loss of energy. gas molecules collide with the container walls without loss of energy. the pressure of a gas at constant temperature in a sealed container will gradually decrease. because of the relationship between temperature and average molecular speed, the temperature of a gas would drop if energy were lost in collisions. friction does not slow down gas particles and cause them to stop moving.
The pressure of a gas at a constant temperature in a sealed container will gradually decrease. Option C.
Gases are made up of particles molecules or atoms in constant random motion. Gas particles constantly collide with each other and with the walls of the container. These collisions are elastic. That is, there is no net energy loss due to collision. The pressure of a constant temperature gas in a closed container gradually decreases.
The above statement is incorrect because the pressure of a gas at a constant temperature depends on the volume of the gas. If the container is sealed, the volume of gas is also constant. Collisions are completely elastic. When two molecules collide, they change direction and kinetic energy, but all kinetic energy is conserved. Collisions are not sticky. The average kinetic energy of gas molecules is directly proportional to absolute temperature.
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52.31g of Cu(NO3) is dissolved in enough water to make 1.400 mL of total solution. what is the molarity of solute in the resulting soultion?
Molarity :
The number of moles of solute per liter of solution is known as molarity or molar concentration. It is used to express the concentration of a given solute in a solution.
It can be calculated using the formula, Molarity = [tex]\frac{number-of- moles-of-solute}{Volume-of-the-solution-in-liters}[/tex]
Given data:
Mass of the solute ( Cu(NO3) ) = 52.31 g
Volume of the solution = 1400 mL = 1.4 Liters,
Then, Molar mass of the solute = 125.55 g/mol
Then, number of moles of solute = [tex]\frac{mass of solute}{molar mass of solute}[/tex]
= [tex]\frac{52.31}{125.55}[/tex] = 0.417 mole
Then, Molarity = [tex]\frac{0.417}{1.4}[/tex] = 0.298 M
Therefore, the molarity of solute in the resulting solution is = 0.298 M
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Click here to view a list of the common polyatomic ions. what is the formula for ammonium sulfate? nh4so4 na2so3 (nh4)2so4 na2so4
Option C ;(NH4)2SO4 is the formula for ammonium sulfate.
It is an inorganic salt. It appears as fine white crystals. Its molecular weight is 132.14g/mol. Its density is 1.77g/cm³.It has many commercial uses. It is mainly used as fertilizer for alkaline soils because ammonium ions forms small amounts of acid which lowers the pH of the soil.
It is acidic with pH of 5.5. Its melting point is 235 °C. it is soluble in water. It is obtained by the reaction of sulfuric acid with ammonia. Sulfuric acid will react with two equivalents of ammonia.
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Answer:
C. (NH4)2SO4
And the second question is
A. KOH
Explanation:
Which sentence most accurately describes the daily growth rate of plants? (1 point)
Answer: D- average change in plant height, divided by, the number of days.
(i had to look up the test you were talking about to find what the answer choices were.)
Hope this helps!
Atoms of the element sodium want to give up an electron because sodium atoms
Sodium is highly electropositive thus it can easily give out one electron from the outermost shell of the atom of the element.
Why does sodium give up an electron?We know that sodium is an element that has been found to be a member of group one of the periodic table. This implies that the sodium has only one electron in the outermost shell of the atom. As such, the sodium atom is quite very reactive and we observe that the sodium atom does loose electron easily.
The elements that are in the first group of the periodic table are highly electropositive and this is what informs the fact they have a tendency to loose electrons quickly.
When the sodium atom looses an electron, it forms a univalent positive ion and there is a loss of an entire shell and this is why we find out that sodium does not occur in a free sate in nature owing to the fact that it tends to react very much.
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CAN someone please help me !!!!!!!!!!!
Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor. That is option B.
What are electrical forces?An electrical field is defined as the type of field that is surrounded by charged particles which may be negatively or positively charged.
A battery is an electron chemical cell that has the ability to generate electrical energy through chemical reaction in its cells.
A magnetic force is defined as the type of force generated through the action of moving electric charges or magnetic materials.
When the number of batteries in a circuit is being increased, there would be increase in the input voltage leading to an increase in the magnitude of the speed.
Therefore, the motor is expected to run faster because of the increased magnetic force of the motor which is caused by increase electrical force.
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What is a plasma?
A. A partly melted solid
B. A superheated gas
C. A liquid in which the atoms move back and forth
D. A gas where the atoms are in fixed positions
Answer:
Option B is the right answer.
New crust is found at the center of the _____, proving the movement of the seafloor and the surface of the Earth.
A. ocean
B. Himalayan Mountains
C. Earth
D. mid-ocean ridge
New crust is found at the center of the mid-ocean ridge, proving the movement of the seafloor and the surface of the Earth and is denoted as option D.
What is Mid-ocean ridge?
These are structures which are formed where two tectonic plates are spreading apart and therefore forms the seafloor which is present in larger types of water bodies such as sea, oceans etc.
There is also the presence of new crust at the center and it helps to prove movement of the surface of the earth which is therefore the reason why it was chosen as the correct choice.
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2h2(g)+O2(g)----> 2H2O(g)
How any moles of o2 are required to react with 2 moles of H2
The number of moles of [tex]O_2[/tex] required to react with 2 moles of [tex]H_2[/tex] according to the reaction will be 4 moles.
Stoichiometric problemFrom the balanced equation of the reaction:
[tex]2H_2 (g) + O_2 (g) -- > 2H_2O (g)[/tex]
The mole ratio of hydrogen to oxygen is 2:1. This means that for every 1 mole of hydrogen that reacts to form 1 mole of water, 0.5 moles of oxygen is required. Also, for every 1 mole of oxygen, 2 moles of hydrogen are required.
Once the mole of hydrogen increases, the mole of oxygen also has to increase proportionately. Otherwise, oxygen becomes limited in availability, and hydrogen will be in excess.
From the equation of the reaction, 1 mole of oxygen requires 2 moles of hydrogen. Thus, with 2 moles of oxygen, 4 moles of hydrogen will be needed for a complete reaction.
In summary, the number of moles of [tex]O_2[/tex] that are required to react with 2 moles of [tex]H_2[/tex] is 4 moles.
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Explain the difference between the first and second ionization energy of an element.
The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
Ionization energy is the energy required to remove the electron . First ionization energy is the amount of energy required to remove the electron from neutral atom such as M. while second ionization energy is the amount of energy required to remove electron from positively charged ion such as M⁺.
first ionization energy is given as :
M ---> M⁺ + e⁻ , IE1
second ionization energy is given as :
M⁺ ----> M²⁺ + e⁻ , IE2
Thus, The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
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name the three hardest substances that were tested. To what classes of solids do these substances belong? What general feature do these three types of solids have in common
Three hardest substances that were tested is aluminum, silicon dioxide and sucrose and the classes of solids do these substances belong is metallic type of solid and general feature do these three types of solids have in common are melting point and hardness
Hardest substance are that cannot be crushed, cut distorted or scrapped readily and the hardness of a substance is dictated by its crystalline structure which is regular and the three three hardest substances that were tested is aluminum, silicon dioxide and sucrose
Three substances classes of solid are also same the classes of solids these substances belong is metallic type of solid and general feature are also same of solids have in common are melting point and hardness metallic solid means metal is a solid in which hard in the nature shiny and smooth and so many metals are too hard
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do eukaryotic Cells have DNA found in the nucleus. True or false
Before using a solution of n a o h as titrant in a titration experiment, you should standardize the solution. Standardization is the process of titrating a solution prepared from.
The reason for the standardization of sodium hydroxide is that the compound is deliquescent.
What is the need for standardization?The term standardization has to do with the process by which the concentration of the sodium hydroxide is determined. We know that there are some compounds that we do not need to standardize before they are used. The solid is just dissolved and made up to mark and then the solution thus prepared could be used in the standardization of other solutions.
However, this is not the case for sodium hydroxide because the compound in itself is deliquescent. This means that the solid is able to absorb moisture hence we can not get the actual amount of the sodium hydroxide by merely weighing the solid.
As such, we can be able to obtain the concentration of the sodium hydroxide by standardizing it using a primary standard.
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Which principle did you apply in Step 4 of the
investigation?
Answer:
Find root causes.
Explanation:
i hope the answer be right
Due to the human extermination of prairie dogs in South Dakota, black footed ferrets became endangered in 1973. Only 18 ferrets were in existence in 1987. Rangers began a captive breeding program to increase their population numbers. The ferrets were later released in the Badlands and Wind Cave National Park in 2007.
Which type of conservation effort is this?
Responses
A. resource conservation
B. wildlife reintroduction
C.predator management
D.ecological introduction
The type of conservation effort which involves the captive breeding program to increase the population numbers of Ferrets is resource conservation and is denoted as option A.
What is Conservation?This is referred to as the process in which valuable resources which are present on earth such as plants, minerals etc are protected through various means by the appropriate authorities or individual.
Conservation helps to prevent dying out and extinction of species which is denoted in the captive breeding program to increase the population numbers of Ferrets so as to prevent the extinction of the animal hence option A was chosen.
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which part of your brain most likely works hardest
Answer:
The Stroop effect is a simple phenomenon that reveals a lot about how the how the brain processes information.
Answer: The Cerebral Cortex
Explanation: Most information processing takes place here!
please help
could you measure the volume of an object with a cube shape using the overflow can explain your answer.
The volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.
What is volume?Volume is defined as the area that any three-dimensional solid takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres.
The cubic meter serves as its equivalent in the International System of Units. Given that it can be computed using lengths, it is not regarded as a fundamental unit of the SI. The liter is the most widely used measurement.
The cube's volume is equal to the edge's length raised by three.
Thus, the volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.
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Can I find a tutor help me wit this question?
Chemistry =>Introduction to Chemistry => Scientific Method
A scientific method corresponds to a methodology to obtain new knowledge.
We must start from an idea, an assumption of how a compound or a process behaves, this is our hypothesis.
Following this, we must identify what can affect our process, what are the variables, and what will be the response variable, for this we carry out an experiment.
Once the experiments have been carried out, we must analyze the results, draw conclusions as to why the behavior occurs, and if our hypothesis is true or not.
It is useless for us to obtain new knowledge if we do not share it, We have to share the results, in this way other people can start from that knowledge to create another,
Therefore, the answer will be:
1. Make a hypothesis
2. Conduct an experiment
3. Analyze the experiment data
4. Communicate the results
Select the correct answer. what is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br
The correct chemical formula of magnesium bromide is MgBr₂.
Ionic bonds are formed by transfer of electrons between metal and non metals.
Electronic configuration of magnesium:
[Mg] :12 : 1s², 2s², 2p⁶, 3s²
Magnesium atom will lose two electron to gain noble gas configuration and form magnesium cation with +2 charge.
[Mg²⁺] : 1s², 2s², 2p⁶
Electronic configuration of bromine:
[Br] : 35 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵
Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.
[Br⁻] : 36 : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶
In magnesium bromide, two electrons from metal gets transferred to bromine atom and thus form an ionic bond to give MgBr₂.
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suppose you are titrating an acid of unknown concentration with a standardized base. at the beginning of the titration, you read the base titrant volume as 2.75 ml. after running the titration and reaching the endpoint, you read the base titrant volume as 26.18 ml. what volume, in ml, of base was required for the titration?
The volume of the standardized base used in the titration was 23.43 mL.
When performing titration, the volume of the standardized base titrant used in the burette is read first (this value doesn't have to be 0, as it depends on the titrator filling the burette). In this case, this value is 2.75 mL.
During the titration, the titrant level in the burette goes down, and when the endpoint is reached, this level can be read. In this experiment, the final volume is 26.18 mL.
The volume used in the titration is obtained by subtracting the starting value from the final volume:
26.18 mL - 2.75 mL = 23.43 mL
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe? they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.
Answer:
1 ) They are wealthy in gases hydrogen and helium. 2 ) They are very hot and dense . 3 ) They have a solid gravitational pull.
Explanation:
Space where huge size of gaseous and dust cloud is present is called nebula. It is mainly made of hydrogen and helium. Nebula exist in the space which is between the stars and it is call as interstellar space.
Helix nebula is closest nebula which is near the earth. It’s distance from earth is about 700 light years.
Dark nebulae are very dense as well as cold. Nebula can be divided into dark nebula and bright nebula. The gas which is present between the stars is always combine with solid grains cosmic dust.
Nebulae contribute more to stellar creation than other areas of the universe for the following three reasons:
They are abundant in helium and hydrogen.They are hot and thick.They are highly gravitationally drawn.So, the correct options are A, D and E.
What is Nebulae?Huge clouds of gas and dust known as nebulae are found in space and are made up of heavier elements in the form of dust particles as well as ionized gases like hydrogen and helium.
Because the gases and dust within them have the potential to collapse under the influence of gravity and form new celestial objects, they are frequently the birthplace of stars and planetary systems. They are rich in hydrogen and helium. They have a strong gravitational pull and are hot and dense.
Hence, the correct options are A, D and E.
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.a cu2 standard solution was prepared by diluting 1.50 ml of 3.95 x 10-2 m cu2 stock solution to a total volume of 25.00 ml. what is the concentration of cu2 in the standard solution?
the concentration of cu2 in the standard solution is 2.37*10^-3 M
What is concentration ?
The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little amount of dissolved solute.
V1S1 = V2S2
S2 = V1S1/V2 = ( 1.50*3.95*10^-2)/25 = 2.37*10^-3 M
the concentration of cu2 in the standard solution is 2.37*10^-3 M
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a drug you're investigating demonstrates >90% absorption, but it's highest unit dose does not completely dissolve in 250 ml of solvent. the biopharmaceutics classification system would identify this drug as class:
The biopharmaceutics classification system would identify this drug as class ll drug having greater than 90% absorption.
What is biopharmaceutics classification system and which class drug have more than 90% absorption?BCS biopharmaceutics classification system is a system classifying a drug substance based on its solubility.There is a certain range of PH for this solubility to follow to be validated for human doses.Now in this question is asked about highest unit dose having absorption capacity of more than 90% and what class this drug does belong to.Class - ll is the class of drug having absorption power more than 90% and its highest unit dose does not completely in 250 ml .To know more about biopharmaceutics visit:
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how to safely handle acids?
Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions. Purchase dilute acids whenever possible Acid handling requires the use of latex gloves. Solvent and chemicals in miscellaneous category require the use of polythene gloves. Check the gloves for any pin-holes prior to use. Wash your hands before eating, even if gloves were used while handling the chemical.
i know it'sis a lot and it's a little messed up but can you handle it if you can and if it's right you mind giving me a brainliest?
Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions
