Answer:
Enzymes act as catalysts, accelerating the chemical reaction by lowering the activation energy. Activation energy is the energy needed for the particles to react. Enzymes come out of the reaction unchanged.
Explanation:
Find the element that is oxidized and the one that is reduced KClO3 + 6 FeSO4 + 3 H2SO4 --> KCl + 3 Fe2(SO4)3 + 3 H2O
Answer: Fe is the element that is being oxidized (oxidation number changes from +2 to +3) while Cl is the element that is reduced (oxidation number changes from +5 to -1) in the given reaction.
Explanation:
The question requires us to find the element that is oxidized and the one reduced in the following chemical reaction:
[tex]KClO_3+6FeSO_4+3H_2SO_4\rightarrow KCl+3Fe_2(SO_4)_3+3H_2O[/tex]To solve this problem, we need to determine the oxidation number of all elements in the reactants and products sides, and then identify the elements that had their oxidation number increased (oxidized species) and decreased (reduced species).
To identify the oxidation numbers, we'll need to remember a few points:
- K is an alkali metal (part of group 1 in the periodic table), and it usually assumes the oxidation number +1;
- O usually presents oxidation number -2, except in a few specific cases;
- the anion (SO4) presents total charge -2 (in this anion, S presents oxidation number +6 and O, -2);
- H usually presents oxidation number +1.
Next, let's identify the oxidation number of all elements involved in the reaction, on both sides of the chemical equation. Since all compounds are neutral (i.e., they do not present charge), the sum of all oxidation numbers must be 0:
(note that the oxidation number of each element is indicated in red, above the respective element, while the contribution of this element to the molecule charge, considering the number of atoms, is represented in blue below the element).
In the image above, we can see that Cl has its oxidation number changing from +5 in KClO3 to -1 in KCl (highlighted in purple), while Fe has its oxidation number changing from +2 in FeSO4 to +3 in Fe2(SO4)3 (highlighted in green).
Therefore, we can say that Fe is the element that is being oxidized while Cl is the element that is reduced in the given reaction.
The density of a pure substance is always
the ............ under the same conditions
An physical properly I believe
Explanation: characteristics such as melting point boiling point color ider colored stuff etc all have physical properties
5. The electrical charges in an atom are located
A. only in the nucleus B. on protons and neutrons
C. on protons and electrons D. on protons, electrons, and
and ato
neutrons
15151 mostly
The correct option is (B) On protons and neutrons
The electrical charges in an atom are located on protons and neutrons.
What is an atomic structure?Protons and neutrons, two different subatomic particle kinds, are found in the nucleus of the atom. The neutrons have no electrical charge, while the protons are positively charged. Electrons, a third category of subatomic particle, move about the nucleus. The electrical charge on the electrons is negative. Protons and electrons, which are both positively and negatively charged, often exist in equal numbers in an atom. The atom becomes electrically neutral as a result. Around the nucleus, electrons exist at various energies, or "shells." The number of electrons that can fit inside the shell is constrained. There are various numbers of protons in the nucleus of an atom, depending on the composition. The atomic number, which is the sum of the numbers of protons and neutrons in the nucleus, is referred to as the mass number.Learn more about the Atomic structure with the help of the given link:
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how many moles of permanganate were used? [2] 4. how many moles of iron were required to react with the permanganate? [1] 5. what is the mass of iron present in the initial sample? [1] 6. what is the mass percent of iron in the unknown iron sample? [2] 7. a student performed the experiment and got a higher mass percent than expected. other than human error or machine malfunctions, briefly explain a source of error from the experiment.
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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.
a gas reacts with a solid that is present in large chunks, then the reaction is run again with the solid pulverized. how does the increase in the surface area of the solid affect the rate of its reactoi
An increase in the surface area of the solid will increase the rate of the reaction.
The reaction rate will be influenced by the solid's surface area if one of the reactants is solid. This is due to the fact that the two kinds of molecules can only collide at the liquid-solid interface, also known as on the surface of the solid. The reaction rate will rise due to a more significant interaction of the surface areas between the two molecules when the solid is pulverized into a gas. If a reactant has a larger surface area: The other reactant is exposed to more particles. Particles are more likely to collide, which results in more successful collisions per second this will influence the reaction speed to increase.
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if there are 125 atoms of the parent isotope remaining and 875 atoms of the daughter isotope in a rock, how many half-lives have passed since the rock formed?
To solve this question we need to know the concept behind half life. Decay of radioactive element always comes under first order kinetics. Three half-lives have passed since the rock formed.
What is half life?Half life tells about the time at which the radioactive material decays to half of its initial concentration.
Mathematically the the total number of half life can be calculated as
[tex]\rm \frac{t}{t_{1/2}} =-\frac{ln\frac{N_{t}}{N_{0}} }{ln 2}[/tex]
Nt= amount of the isotope that has not yet decayed after a time t
N₀= initial amount of the isotope
t=the time
[tex]t_{1/2}[/tex] = the half-life
Substituting the given values in the above equation
[tex]\rm \frac{t}{t_{1/2}} =-\frac{ln\frac{125}{100} }{ln 2}[/tex]
Solving this we get
3[tex]t_[1/2}[/tex]= t
Therefore, three half-lives have passed since the rock formed.
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a student wrote this name for a compound made of calcium and sulfer. Sulfer calcium. What is wrong with this name? Write the correct name for the compound.
Answer: Should actually be Calcium Sulfide
Explanation: Alkali metal + non metal = salt.
2nd element in compound should either end in -ide or
what is meant by the rate of a reaction? the rate of a reaction what is meant by the rate of a reaction?the rate of a reaction indicates how fast the products are formed or how fast the reactants are consumed. is the number of collisions between the molecules of reactants per unit of time. is the difference between the rate of formation of the products and the rate of disappearance of the reactants. indicates what amount of product can be obtained from the given amount of reactant.
The rate of a reaction indicates how fast the products are formed or how fast the reactants are consumed. Option A.
The reaction rate or rate of reaction is the rate at which a chemical reaction occurs and is defined as proportional to the increase in the concentration of products per unit of time and the decrease in the concentration of reactants per unit of time. Reaction rates vary greatly. The reaction rate is the rate at which a reaction reaches equilibrium.
In enzyme-catalyzed reactions, the rate is usually expressed as the amount of product produced per minute. The reaction rate is determined by the energy barrier between the reaction and the products. Reaction rate indicates the speed of reaction. That is how quickly reactants are consumed, how quickly products are formed, or how quickly energy is absorbed or released. Reaction speed is a powerful diagnostic tool. By understanding the speed at which products are made and the causes of slow reactions.
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i really need the ansewer so whats the answer?
Energy was lost by substance A to the environment is the statement which best supports the data in the table and is denoted as option D.
What is Energy transfer?This is referred to as the processes which is characterized by the movement of energy from one system to another an an example is heat energy transfer which have different techniques such as conduction, convection etc.
Temperature on the other hand is the measure of the degree of hotness or coldness of a substance and is influenced by heat energy.
From the graph, we can deduce that substance has a temperature which was decreasing with time while substance B has a temperature which was constant throughout.
This therefore means that Energy was lost by substance A to the environment hence ,the reason why option D was chosen as the correct choice.
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a) cite the major differences between activation and concentration polarizations. (b) under what conditions is activation polarization rate controlling? (c) under what conditions is concentration polarization rate controlling?
Activation polarization is occuring due to the evolution or deposition of some gases taking place in a redox reaction. Concentration polarization occurs between two electrodes when uneven distribution of ions occurs in the boundary.
What is polarization?Polarization is the process of charge separation between two species or the potential difference occurred due to the concentration gradient.
The two types of polarization occuring are activation polarization and concentration polarization. In activation polarization there occurs difference by the accumulation of gases.
For example the evolution of gases from the hydrogen electrode immersed in an electrolyte causes a polarization between the two electrodes.
In concentration polarization, there will be a concentration gradient of ions in the boundary of two electrodes occured due the electroanalytical reaction.
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Why was temperature change for the water slight in your experiments while the temperature change for the metal was large?.
The difference in the temperature change can be explained by the difference in the specific heat capacity for water (4.186 J/g°C) and the specific heat capacity for the metal you used (metals have small values for specific heat capacities).
Specific heat capacity is a material characteristic that quantifies how much heat (in Joules) is needed to change the temperature of 1 g of the material by a single degree (°C or K). Water has a relatively high specific heat capacity (4.186 J/g°C), which means that you need to add 4.186 Joules of heat to increase the temperature of 1 g of water by 1 °C.
On the other hand, metals have small values for their specific heat capacities (0.900 J/g°C for aluminum, 0.386 J/g°C for copper, 0.420 J/g°C for steel), which means that their temperature will drastically change for the same amount of heat invested or taken away.
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3.23x106 kJ to kcal
Express the value kilocalories in to three significant figures
help me please!
The value into kilocalories up to three significant figures is 77.1 x 10^3 kilocalories
1 kj = 0.239 kilocalorie
3.23 x 10^6 kJ x 0.239 kilocalorie = 77.1 x 10^3 kilocalories
3.23 x 10^6 kJ = 77.1 x 10^3 kilocalories
What is Significant figure ?In chemistry, Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
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7. This question is about calculating the area.
A nanoparticle is in the shape of a cuboid.
Calculate its surface area to volume ratio.
Show working.
a
a = 80 nm
b = 15mm
c = 20nm
C
Surface area to volume ratio:
Answer:
Explanation
Finally, we can calculate the surface-area-to-volume ratio of the nanoparticle by dividing 4750 nanometers squared by 18750 nanometers cubed. It is important to place the surface area first because that is what the problem is asking us to compare.
A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Smoke and steam were released as well. Which conclusion is BEST supported by this observation?
A.
Water was vaporized.
B.
Dissolved gases were released.
C.
A chemical change took place.
D.
The lithium was dissolved by the water.
Answer:
Explanation:Again, this is an example of a physical change. Figure 3.6. 1: Ice melting is a physical change. When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.03-Sept-2019
Using the periodic table, predict whether the following chlorides are ionic or covalent: SiCl4, PCl3, CaCl2, CsCl, CuCl2, and CrCl3.
The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
SiCl₄ is silicon tetrachloride. SiCl₄ is a covalent. The bond between silicon and chlorine is formed by the sharing of electrons.
PCl₃ is Phosphorous trichloride . PCl₃ is covalent. Phosphorus contain 5 electrons in valence shell and requires 3 more to complete octet and chlorine require one electron to complete octet so, the bond formed is by sharing of electron.
CaCl₂ is calcium chloride. CaCl₂ is an ionic. calcium is metal and metal donates electron to chlorine is non metal and non metal accept electrons and become Ca²⁺ and Cl⁻. The bond formed by the transfer of electrons.
CsCl is cesium chloride. CsCl is an ionic. symbol of ions : Cs⁺ and Cl⁻
CuCl₂ is copper(II) chloride. CuCl₂ is ionic formed by the transfer of electrons. symbol of ions : Cu²⁺ and Cl⁻
CrCl₃ is chromium(III) chloride. CrCl₃ is an ionic. symbol of ions : Cr³⁺ and Cl⁻.
Thus, The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
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help me out please and thank you
What occurs when copper sulfate solution is combined with a piece of silver metal?
If the reaction happens, you should also write the chemical equation in balance.
Reactions to displacement as a first option
A more reactive metal can displace a less reactive metal from a solution in a displacement reaction. The reactivity series of metals can be used to forecast the end products of a displacement process. The metals are arranged according to their reactivity with diluted acids in the reactivity series. A specific metal in the reactivity series may be displaced by metals positioned above it.
In the reactivity series, some of the elements above hydrogen (H) are potassium (K), sodium (Na), magnesium (Mg), zinc (Zn), and others. Several of the metals in the reactivity sequence below hydrogen
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CH3F is a polar molecule, even though the tetrahedral geometry often leads to nonpolar molecules. explain.
Explanation:
A. Even though CH3F has a tetrahedral geometry, the molecule is not symmetric due to the presence of the fluorine atom in the structure resulting in the molecule being polar.
B. None of the above gives a valid explanation.
C. Even though CH3F has a tetrahedral geometry, the carbon atom in the molecule, being the central atom, is more electronegative than the hydrogen and fluorine atoms in the molecule resulting in the molecule being polar.
D. Even though CH3F has a tetrahedral geometry, the fluorine atom in the molecule, being the central atom, is more electronegative than the hydrogen and carbon atoms in the molecule resulting in the molecule being polar.
E. Even though CH3F has a tetrahedral geometry, the hydrogen atoms in the molecule are more electronegative than the fluorine resulting in the molecule being polar.
Respiration, which releases the energy in food molecules, usually involves _________
Respiration, which releases the energy in food molecules, usually involves energy and enzymes.
What is respiration?Respiration is the process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.
Respiration is the major process through which living organisms obtain their energy. They do this by breaking down food ingested.
Cellular respiration combines glucose and oxygen to synthesise carbondioxide and water as products. This process synthesize a large amount of energy, however, it utilizes energy as well.
Therefore, energy and enzymes are used up in the process of cellular respiration.
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preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 100g + 10g
b) 903cm x 10cm
c) 0.6030 cm(2) ÷ 0.1cm
d) 9.5 mm + 0.083 mm
e) 430.0 mL - 10.2111 mL
f) 762.4 m + 3.2m + 1.21m
Preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
a) 100 g + 10 g = 110g
b) 903 cm × 10 cm = 9030 cm
c) 0.6030 cm² / 0.1 cm = 6.0 cm
here lowest significant is = 0.1 , so ans will round off till first decimal.
d) 9.5 mm + 0.083 mm = 9.583 mm = 9.6 mm
e) 430.0 mL -10.2111 mL = 419.8 mL
f) 762.4 m + 3.2 m + 1.21 m = 766.8 m
here the lowest significant figure = 3.2 , so the ans will be round off to first decimal figure.
Thus, preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
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If you assumed 100 total atoms in a sample, how could you relate the % values shown in the sim into a number you could use for your calculation of average atomic mass?
If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
To calculated the average atomic mass, we have to multiply the isotopes mass of each to the % abundance then add .
the formula for the calculation of average atomic mass :
Average atomic mass = ∑ ( isotope mass × % of abundance )
Thus, If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
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20 points for answer: D=m/v. Mass=30g and Volume=6mL
Answer:
density = 5 g/ml
Explanation:
D=m/v. Mass=30g and Volume=6mL
SO solve for D when m = 30 and v = 6
D=m/v
D = 30/6
density = 5 g/ml
The half life for the decay of radium is 1620 years. What is the rate constant for this first-order process?.
The rate constant of the Decay of Radium with half life of 1620 years is 0.0004277/year.
We know, every radioactive reaction is a first order reaction.
So, it will follow the first order kinetics.
The half life of the radium sample is 1620 years.
We know, the standard formula for the half life of the first order reaction is,
T = 0.693/K
Where,
T is the half life of the reaction,
L is the rate constant of the reaction.
It is given that the half life of the reaction is 1620 years, so, putting all the values,
T = 0.693/K
K = 0.693/1620
K = 0.0004277/year.
So, the rate constant of the decay of radium is 0.0004277/year.
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A physical model of a crime scene is called
O a map
O an animation
O a reenactment
O a reconstruction
A physical model of a crime scene is called an animation
What exactly is tangible proof at a crime scene?The evidence that crime scene investigators gather includes fingerprints, tyre tracks, hairs, fibres, blood, and other bodily fluids. The NIJ sponsors initiatives to enhance: Blood and other bodily fluids at the location were identified.
There are three different sorts of imprint evidence: bite marks, tool marks, and shoe and tyre prints. Each of these may employ one or more of the following collection strategies, such as taking photos, lifting objects with tape, or plaster-casting.
Physical evidence, also known as actual evidence or material evidence, is any tangible thing that is presented as evidence in a court case that has some connection to the issue that gave birth to the dispute.
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Answer:
The answer is O a reconstruction.
Explanation:
Got it right on the test.
How many moles are in 175.9 g of Krypton?
Answer:
2.09 molesExplanation:
We can find the number of moles from the given mass of the element by using the formula
[tex]n = \frac{m}{M} \\ [/tex]
m is the mass
M is the molar mass
n is the number of moles
The molar mass of krypton is 84 g/mol
We have
[tex]n = \frac{175.9}{84} = 2.094\\ [/tex]
We have the final answer as
2.09 molesHope this helps you
Carbon dioxide (co2) is a gaseous compound. calculate the percent composition of this compound. answer using one decimal place. what is the percent by mass of carbon? % what is the percent by mass of oxygen? %
The percent composition of carbon dioxide is as follows: 27.3% carbon, 72.7% oxygen.
To calculate the percent composition of the compound, we can assume that we have one mol of carbon dioxide. The molar mass of carbon dioxide is 44 g/mol.
Based on the molecular formula of carbon dioxide (CO₂), we can say that 1 mol of CO₂ contains 1 mol of carbon and two moles of oxygen.
The molar mass of carbon is 12 g/mol, and we can calculate its percent by mass by dividing the mass of carbon in carbon dioxide by the mass of carbon dioxide and multiplying the result by 100%:
%C = 100% * 12 g/mol / 44 g/mol
%C = 27.3%
Because carbon dioxide is made of only carbon and oxygen, we can the oxygen percent by mass by simply subtracting the carbon percent by mass from 100%:
%O = 100% - %C
%O = 100% - 27.3%
%O = 72.7%
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a flexible container at an initial volume of 8.15 l contains 9.51 mol of gas. more gas is then added to the container until it reaches a final volume of 15.5 l. assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
The number of moles added to increase the volume of the gas from 8.51 L to 15.5 L is 8.67 moles.
The initial volume of the gas is 8.15 L and final volume of gas is 15.5 L and the initial moles are 9.51 moles.
As per the Ideal gas equation,
PV = nRT
where,
P is pressure,
V is volume of gas,
n is the number of moles of gas,
R is the gas constant,
T is the temperature of the gas.
Rearranging the equation,
V/n = RT/P
The left side is constant, so, it is valid to see,
V₁/n₁ = V₂/n₂
V₁ is initial volume,
n₁ is the initial moles,
V₂ is the final volume,
n₂ is the final moles.
So, we can write this by putting the values,
8.51/(9.5) = 15.5/n₂
n₂ = 18.17
The number of moles added = n₁ - n₂
Added moles = 8.67 moles
The moles added are 8.67 moles.
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Profiles Tab Window HelpE- CengageNOW Online texgmenttakeCovalentActivity.do?locator assignment-takeTUTOR Percent YieldCengage: Digital Course S xResubmit[References]Consider this reaction, which occurs in the atmosphere and contributes to photochemical smog:N₂(9) + O₂(g) -2NO(g)If there is 16.28 g N₂ and excess O₂ present, the reaction yields 27.5 g NO. Calculate the percent yield for thereaction.Show Approach Show Tutor StepsE-OWL2| Online teaching x E OWLA21 Assignments | D902IncorrectYou can work though the tutor steps and submit your answer again.2
Answer:
[tex]78.83\text{ \%}[/tex]Explanation:
Here, we want to calculate the percentage yield of the reaction
Mathematically, we have that as:
[tex]\frac{Actual\text{ Yield}}{Theoretical\text{ Yiled }}\text{ }\times\text{ 100 \%}[/tex]The mass of the product NO given in the question is the actual yield which is 27.50 g
Now, let us get the theoretical yield
We find the number of moles of nitrogen gas that reacted
Mathematically, that is the mass of nitrogen gas divided by the molar mass
The molar mass of the nitrogen gas is 28 g/mol
The number of moles is thus:
[tex]\frac{16.28}{28}\text{ = 0.5814 mol}[/tex]From the equation of reaction, 1 mole of N2 yields 2 moles of NO
Thus, 0.5814 mol of N2 will yield:
[tex]0.5814\text{ }\times\text{ 2 = 1.1628 mol}[/tex]Now, to get the mass of NO produced, we multiply this number of moles by the molar mass of NO
The molar mass of NO is 30 g/mol
The mass that was produced is thus:
[tex]30\text{ }\times\text{ 1.1628 = 34.884 g}[/tex]Finally, we have the percentage yield as:
[tex]\frac{27.50}{34.884}\text{ }\times\text{ 100 \% = 78.83 \%}[/tex]to ensure that the decolorization of crystal violet reaction takes place within the linear range of the crystal violet calibration curve, and that there is an excess of hydroxide ions, 10.0 ml of the stock solution of crystal violet is diluted twice. first, with 10.0e so ml of distilled water and then with 10.0 ml of 0.10 m naoh. what is the [oh-] in the final dilute solution?
A calibration curve is a regression model that uses the instrument's reaction to known standards to forecast the unknown concentrations of interest-related analytes.
How do you calculate calibration curve?
The formula will have the general form of y = mx + b, where m denotes the slope and b the y-intercept, as in y = 1.05x + 0.2.When making adjustments to measurements made on samples whose values are unknown, use the equation for the calibration curve.Solve for y (the "true" value) by substituting the measured value (x) into the equation. We have four milliliters of a 2.5 x 10–5 molar solution of crystal violet.the crystal violet kinetics process, too.Usually, adding sodium hydroxide in much larger amounts causes the violet color to fade.You must now add the two of them together to complete this reaction.However, we're attempting to determine the crystal violet concentration prior to the reaction.Therefore, we are not attempting any story geometry; rather, we are attempting to determine the concentration of crystal violet at the start of the reaction.And it's not the crystal violet's concentration.We have four milliliters of a crystal violet solution that is 2.5 x 10 n-5 molar in size.When doing a crystal violet kinetics reaction.The violet tint typically vanishes as you add sodium hydroxide in much bigger amounts.Currently, you need to add the two together in this particular reaction.However, we're looking for the crystal violet concentration just before the reaction starts.We are only attempting to determine the concentration of the crystal violet at the start of the reaction; we are not attempting to perform any stories geometry here.Furthermore, it is not the crystal violet's concentration.All of the components in that particular reaction become diluted when two substances are mixed together.So, when you combine two milliliters of sodium hydroxide solution with four milliliters of the crystal violet solution.The total of those volumes makes up your new volume.Therefore, the result of mixing them is a six-ml solution.Therefore, we must apply the equation polarity times volume is equivalent to mill, aren? T times volume here in order to get the concentration before any of the sodium hydroxide reacts.The number of moles remains constant because we haven't initiated the reaction yet, and it also remains constant in this location.We therefore have a 2.5 times 10 to 5 molar solution. Therefore, we have a 2.5 x 10-5 molar solution in a four milliliter volume.We are currently working on the new mill arat E.However, we are aware that the current volume of our system is six mL.We shall divide both sides by six to obtain the new milliarat E, and we will discover that the new polarity is 1.67 times 10 to the -5moles per liter.We diluted the crystal violet with our other solutions, which reduced the polarity.
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how does the specific heat capacity of water compare with the specific heat capacities of other common materials? how does the specific heat capacity of water compare with the specific heat capacities of other common materials? the specific heat capacity of water is very low in comparison with other common materials. the specific heat capacities of water and other common materials are approximately the same. the specific heat capacity of water is very high in comparison with other common materials.
Liquid water has one of the highest specific heat capacities among common substances, about 4184 J⋅kg−1⋅K−1 at 20 °C; but that of ice, just below 0 °C, is only 2093 J⋅kg−1⋅K−1. The specific heat capacities of iron, granite, and hydrogen gas are about 449 J⋅kg−1⋅K−1, 790 J⋅kg−1⋅K−1, and 14300 J⋅kg−1⋅K−1, respectively.
The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.
The heat capacity of a sample of a substance is divided by the mass of the sample to produce the specific heat capacity (symbol cp), also known as massif heat capacity. Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit. joule per kelvin per kilogram is the specific heat capacity unit in the SI.
A substance's specific heat capacity may be substantially higher when heated in an open vessel that permits expansion than when heated in a closed vessel that prevents expansion, especially when the substance is a gas (specific heat capacity at constant pressure) (specific heat capacity at constant volume).
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How many grams of Cu are obtained by passing a current of 12 A through a solution of CuSO4 for 30 minutes?
The quantity of Cu deposited at the cathode will be 7.117 grams.
Given,
Current (in Amperes) = 12 A
This will be equal to 12 C/s (in coulombs per second).
Therefore the total charge in 30 minutes will be:
Q = 12C/s × 30 min × 60 seconds/minute
=> Q = 21600 C
Now, the number of moles of copper which are plated out (n) will be :
n = Q / z·F
In the half-cell reaction,
the number of electrons ( for Cu ) will be = 2 (Cu 2+)
F, the Faraday's constant = 96,485 per mole
We have already discussed that,
n = Q / z.F
=> n = 21600 / (2×96485)
=> n = 0.112 mol
So, 0.112 mol of Cu will be equal to:
0.112×63.546 = 7.117 g
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