The Rf value is used to produce a final confirmation of the identify of a substance its true sentence
In thin-layer chromatography, the retention factor Rf is used to compare and help identify compounds and the Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front both measured from the origin and Rf values are used to determine polarity, relative masses, and relative solubility's, among other things
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The drawing shows Earth's revolution around the Sun.
Based on the drawing, what season are students in Florida experiencing when Earth is at position 1?
According to the image, it can be inferred that the students in Florida are in summer when the earth is in position 1.
What relationship does the movement of the earth have with the seasons?The seasons are a term that refers to each of the periods of time in which the year is divided, with a duration greater than the months, characterized by the typical behavior of some meteorological variable. They occur cyclically and inverted between one hemisphere and another.
In general, the seasons are divided in this way:
Position 1: June 21 - September 23
Boreal Summer
I invest Austral
Position 2: September 23 - December 21
boreal autumn
southern spring
Position 3: December 21 - March 21
boreal winter
Ausral Summer
Position 4: March 21 - June 21
boreal spring
southern autumn
According to the above, it can be inferred that in position 1 the students from Florida will be in the summer season because Florida is in the boreal hemisphere of the earth (Northern hemisphere).
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Law of conservation of mass 21 g of A and 21 g of b produce 17 g of c
The fact that 21 g of A and 21 g of B produce 17 g of C does not obey the law of conservation of mass.
What is the law of conservation of mass?The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.
This law further explains that in a chemical reaction, the amount of reactants must be equal to the amount of products in the reaction.
For example, if a substance A of mass 21g reacts with another substance B of mass 21g, the mass of the product C should be 21g + 21g = 42g in order to align with the law of conservation of mass.
However, according to this question, the product C has a mass of 17g, which shows that the law of conservation of mass is not obeyed.
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how many grams of silver iodide, AgI, are produced from 43.3 g of calcium iodide, CaI2?
Taking into account the reaction stoichiometry, 121.89 grams of AgI are produced from 43.3 g of calcium iodide.
Reaction stoichiometryIn first place, the balanced reaction is:
CaI₂ + 2 AgNO₃ → 2 AgI + Ca(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaI₂: 1 moleAgNO₃: 2 molesAgI: 2 molesCa(NO₃)₂: 1 moleThe molar mass of the compounds is:
CaI₂: 166.9 g/moleAgNO₃: 169.87 g/moleAgI: 234.77 g/moleCa(NO₃)₂: 164 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CaI₂: 1 mole ×166.9 g/mole= 166.8 gramsAgNO₃: 2 moles ×169.87 g/mole= 339.74 gramsAgI: 2 moles ×234.77 g/mole= 469.54 gramsCa(NO₃)₂: 1 mole ×164 g/mole= 164 gramsMass of AgI formedThe following rule of three can be applied: if by reaction stoichiometry 166.8 grams of CaI₂ form 469.54 grams of AgI, 43.3 grams of CaI₂ form how much mass of AgI?
mass of AgI= (43.3 grams of CaI₂×469.54 grams of AgI)÷ 166.8 grams of CaI₂
mass of AgI= 121.89 grams
Finally, 43.3 grams of CaI₂ form 121.89 grams of AgI.
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A solution is made by mixing 84. g of water and 100. g of hexane ()Calculate the mole fraction of water solution .
The mole fraction of the water solution is 0.77.
The mole fraction or molar fraction is defined as a unit of the quantity of a constituent, nᵢ, divided by the total quantity of all parts in a combination.
Moles of water = given mass/ molar mass
Moles of water = 84/18
Moles of water = 4.6
Moles of hexane = given mass/ molar mass
Moles of hexane = 100/76
Moles of hexane = 1.3
Total moles = Moles of water + Moles of hexane
Total moles = 4.6 + 1.3 = 5.9
Mole fraction of water = Moles of water / Total moles
Mole fraction of water = 4.6/5.9
Mole fraction of water = 0.77
Hence, the Mole fraction of water is 0.77.
The mole fraction is the same as the mole percent however in a specific shape in chemistry. Inside the given combination, the range of moles of one constituent is divided by the total number of moles is referred to as the mole fraction. Multiplying the mole fraction of the thing by then we gain the mole percentage of the aspect.
Mole fraction is a unit of awareness, described to be equal to the range of moles of an aspect divided through the whole wide variety of moles of a solution. Because it's miles a ratio, the mole fraction is a unitless expression.
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Hydrochloric acid reacts with zinc, giving zinc chloride and hydrogen.Also,hydrochloric acid in concentrated aqueous solution undergoes electrolysis (with electrodes inert).
Define:
a) the mass in grams of the product in the cathode, if there are 0.5 mol/100 ml of HCl in the solution;
b) boiling under normal conditions of the gas obtained in the anode, if the pH of the acid is 2;
c) the mass in grams of the metal obtained in the cathode (electrolyzed glass), if the salt of zinc is formed by the interaction of 3.65 g of hydrochloric acid with zinc.
Hydrochloric acid reacts with zinc, giving Hydrogen gas and zinc chloride.
What occurs to zinc when zinc and hydrochloric acid interact?An aqueous solution of hydrogen chloride is hydrochloric acid, often called muriatic acid. It is a colorless solution with an overpowering odor.Hydrogen gas and zinc chloride are quickly formed when zinc and hydrochloric acid interact.Zinc metal displaces the hydrogen in a single displacement process to produce zinc chloride and hydrogen gas. Because the related reaction is exothermic, a significant amount of heat is produced: ZnCl2(aq) + H2 + Zn (s) + 2HCl (g)
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Upon combustion, a 0.8009 g
g
sample of a compound containing only carbon, hydrogen, and oxygen produces 1.6004 g
g
CO2
C
O
2
and 0.6551 g
g
H2O
H
2
O
. Find the empirical formula of the compound.
The empirical formula of the compound is mathematically given as
C2H4O
This is further explained below.
What is the empirical formula?Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.
As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.
moles of CO_2=[tex]\frac{ 1.6004 }{44.01}[/tex]
moles of CO_2= 0.0364 moles
moles of H_2O=[tex]\frac{0.6551}{ 18.01 }[/tex]
moles of CO_2= 0.0364 moles
It takes 0.0364 moles of carbon to make up 1 mole of carbon dioxide.
1 mole of H2O contains 2 moles of hydrogen, which is equal to 2 times 0.0364, or 0.0728 moles of hydrogen.
C & H = 0.0364 x 12.01
C & H= 0.437 g C
0.0728 x 1.008 = 0.0734 gH
Mass O = 0.8009 -(0.437 + 0.0734)
Mass O= 0.2905 g
O moles=[tex]\frac{0.2905}{16}[/tex]
O moles= 0.0182 moles
C = [tex]\frac{0.0364}{ 0.0182}[/tex]
C= 2
H =[tex]\frac{0.0728}{ 0.0182}[/tex]
H = 4
O =[tex]\frac{0.0182}{ 0.0182 }[/tex]
O= 1
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Based on the diagram, describe the relationship between the deer population and biodiversity in forest c
Not adversely but deer population do effects the biodiversity in a way that plant diversity specifically get reduced.
What is biodiversity and how deer population effects the biodiversity?Biodiversity refers to the population of all plants and animals living on the earth along with other species.Now deer population is a bane and a boon both to the natural ecosystem, to the diverse unification of species on Earth.Deer in the forest eat the plants that tastes good and leave the ones that do not , even if it is the product or leaves of the same plants.This led to trouble in colonial growth of plants again , which reduces plants in that area.And deer population in every possible forest suffers this issue and collectively it accounts for a big biodiversity reduction.To know more about biodiversity visit:
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What are the wastes product from cellular respiration
The investigators were able to determine that the footprints were made by a Nike, size 10 tennis shoe; however, they couldn’t match it exactly to the suspect’s shoe. What is TRUE about this piece of evidence?
A.
They were unable to find class nor individual characteristics.
B.
They were only able to find class characteristics.
C.
They were only able to find individual characteristics.
D.
They were able to find both class and individual characteristics.
Answer
the correct answer would be A
Explanation:
They were unable to find class nor individual characteristics.
Consider the reaction.2 Pb(s) + O₂(g) →→→ 2 PbO(s)->An excess of oxygen reacts with 451.4 g of lead, forming 316.9 g of lead(II) oxide. Calculate the percent yield of the reaction.
In this question, we have the following reaction:
2 Pb + O2 -> 2 PbO
We have to find the percent yield of this reaction, we have:
451.4 grams of Pb
316.9 grams of PbO, this is the actual yield, we will have to find the theoretical yield now
In order to find the theoretical yield, we need to know how many moles of Pb we have in 451.4 grams, the molar mass of Pb is 207.2g/mol
207.2g = 1 mol
451.4 g = x moles
207.2x = 451.4
x = 451.4/207.2
x = 2.18 moles of Pb in 451.4 grams
According to the molar ratio of Pb and PbO, we have the ratio of 2 moles of Pb to form 2 moles of PbO, therefore if we have 2.18 moles of Pb, we will also have 2.18 moles of PbO.
Now we need to find the theoretical mass of PbO, using its molar mass, 223.2g/mol
223.2g = 1 mol
x grams = 2.18 moles
x = 2.18 * 223.2
x = 486.6 grams of PbO is the theoretical yield
Now to find the percent yield, we need to use the following formula:
%yield = (actual yield/theoretical yield)*100
%yield = (316.9/486.6)*100
%yield = 65
The percent yield of this reaction will be 65%
Help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Measured over twenty years methane is eighty times more powerful than carbon dioxide and causes global warming, while nitrous oxide is 280 times more powerful. During the industrial age, carbon dioxide caused about 10 times more warming than nitrous oxide. But laughing gas is stronger. One pound of gas heats the atmosphere about 300 times more than one pound of carbon in 100 years.
Water vapor is the most powerful greenhouse gas in the Earth's atmosphere and plays a unique role among them. The amount of water vapor in the atmosphere is usually not directly changed by human actions. It depends on the air temperature. Compared to other anthropogenic greenhouse gases, carbon dioxide CO2 has the largest relative contribution to the increase in the greenhouse effect.
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imagine you are given a piece of gold and piece of copper both pieces have a volume of 45 cm3,explain which piece of metal would have the larger mass
Out of gold and copper, gold metal would have larger mass.
What is molar mass?
The mass of any chemical substance divided by the volume of the material is known as the molar mass of that compound.
Given: The value of volume is same for both the metals = 45
The value of the volume is the same for both the metals = 45 cm3
By using formula of density i.e = mass/volume
Since the volume is the same
The density is directly proportional to the mass.
From the periodic table,
The mass of gold = 196.9 u
The mass of copper = 63.5 u
Since the volume is the same, we consider only the absolute masses value
Hence, gold is heavier than copper metal
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4. A balloon filled with 2 L of air is at 313 K. Suppose the temperature increases to 600 K. Calculatewhat happens to the volume of the balloon.
According to Charle's law, a balloon at 600 K has a volume of 3.83 L.
Describe Charles's law.Charles' law states that, under constant pressure, the volume a given amount of gas fills is directly proportional to its absolute temperature. For instance, when the temperature drops during the winter, a basketball placed outside in the ground would contract.
Mathematically, Charles' law can be written as V1/T1 = V2/T2, where V1 denotes the volume at the beginning, T1 the temperature at that point, and V2 the volume at the end with T2 the temperature at that point.
The following examples of how Charles' law is applied in real life:
Helium balloons shrink when it's cold outside.
From Charles' law, V/T = constant
V₁/T₁ = V₂/T₂
or, 2/313 = V₂/600
or, V₂ = (2x600)/313
= 3.83
Hence, form Charles' law we conclude the volume of balloon at 600 K is 3.83 L.
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12) When the pH of a solution decreases, what does that mean for the hydrogen ion concentration?
When the pH of a solution decreases, hydrogen ion concentration increases
The overall concentration of hydrogen ion is inversely related to its pH and can be measured on the pH on the pH scale which is from 1 to 14 and therefore the more hydrogen ions present, the lower the pH conversely the fewer hydrogen ions the higher the pH as the concentration of hydrogen ion is logarithmically inversely proportional to pH and pH of solution is decreased then hydrogen ion concentration will increase by the power of 10
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which hypothesis of thomson’s atomic model was later found to be not true by rutherford and why
The distribution of positive and negative particles was not uniform. This hypothesis of Thomson’s atomic model was later found to be not true by Rutherford.
Because positive charge particle is in center and the negative charge particle is surround to it.
J.J. Thomson proposed that an atom is a definitely charged sphere wherein negatively charged electrons are embedded in it. Neils Bohr proved it to be false as the mass of any atom is localized inside the middle of an atom which is positively charged even as negatively charged electrons revolve across the effective center.
Thomson was incorrect due to the fact he assumed that the positive charge of an atom become all one uniform blob of count number with the electrons transferring in orbits inside the nucleus. If Thomson's model had been accurate, the alpha particles could skip thru the atomic shape of the foil unimpeded.
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Hello, can you give me a concept of what anhydrides are and examples, please?
Anhydrides are binary substances or compounds that are the result of a nonmetal with oxygen.
I leave you 2 steps to make the anhydrides:
1: To make anhydrides, write your nonmetal symbol followed by oxygen.
2: The oxidation numbers must be the same and for this the exchange of oxidation numbers or valence between its non-metallic element and Oxygen is used.
Examples of anhydrides:
1: Chlorous anhydride
[tex]\bold{ \: Cl + O₂ \rightarrow \: Cl₂ O₃}[/tex]
Keep in mind that when it ends in OSO we look for its valence, which in this case would be +3.
2: Iodic anhydride
[tex]\bold{ \: I + O₂ \rightarrow \: I₂ \: O₅}[/tex]
We take into account its symbol that in this would be me and to solve it we must look for its valence that in this case ends in ICO which is already known that its ICO valence is +5.
3: Per bromic anhydride
[tex]\bold{\:Br + O₂ \rightarrow \:Br₂ \:O₇}[/tex]
We take into account its symbol, which in this case would be Br, and to solve it we must find its valence, which in this case ends in ICO, which is already known to have an ICO valence of +7.
The Table of metals and non-metals is attached.
You have plenty of salts that are in front of you and you are trying to figure out which salts are soluble in water, and which ones of their products are soluble in water. For the following equation, identify which reactants and products are soluble/insoluble in water. H2SO4+ Ba(OH)2 =
Sulfuric acid is a strong acid, which means it can dissociate completely when dissolve in water. In other words, the reactant H2SO4 is completely soluble in water, otherwise, it wouldn't be a strong acid.
On other hand, the second reactant Ba(OH)2 is soluble in water because it's a strong base, which are bases that completely dissociate when dissolve in water.
Therefore, sulfuric acid (H2SO4) is soluble in water and the barium hydroxide (Ba(OH)2) is also soluble in water.
A bicyclist is stopped at the entrance to a valley, as sketched below. Where would the bicyclist have the highest potential energy? Where would The bicyclist have the lowest potential energy? Where would bicyclist have the highest kinetic energy? Where would the bicyclist have the highest speed winning? Conversation with the bicyclist’s Kinetic energy be higher at A or B? With a bicycle is potential energy be higher at A or B? What’s a bicyclist total energy we hire at A or B? Supposed to bicyclist lets off the brakes and coast down into the valley without peddling. Even if there was no friction or air resistance to slow her down, what is the farthest point the bicyclist could reach without peddling?
Step 1 - Understanding the relation of potential energy, kinectic energy and the conservation of energy
The potential energy is the energy related to a body that can start moving under the influence of a force anytime soon.
The kinf of potential energy depends on the force that could act on the body. When a body is lifted, because gravity can pull it back, we say that this body has gravitational potential energy
Kinetic energy, on the other hand, is related to actual movement. It depends on the mass as well as on the velocity of the body. When we lift an object and drop it next, all the potential energy will be converted to kinetic energy, i.e., the velocity of the object we dropped will be also proportional to the height. It cannot gain more energy.
Step 2 - Interpreting the problem
Now that we know how potential and kinetic energy work, we can start working on the problem. Since potential energy is directly proportional to height, the highest potential energy would be attained at F.
The lowest potential energy, on the other hand, woud be attained at D, i.e., the smaller height.
The highest kinetic energy would be attained when all the potential energy is converted to kinetic energy, i.e., when the bicyclist, starting at A, loses its potential energy reaching D
The speed is directly proportional to the kinetic energy: the higher the speed, the higher the kinetic energy. Since the kinetic energy, as we saw, is the greatest at D, the velocity will also be the greatest at this point.
Which is the formula for calculating the mass number of an atom?
A protons + neutrons
B quarks + protons
C protons + electrons
D neutrons + electrons
Answer:
A: protons + neutrons
Explanation:
protons and neutrons both have the same mass. Their mass is much greater than the mass of an electron so it is deemed negligible
Solid/liquid/gas
Element/mix/compound
Because........
Answer:
why alkali metal are called as most reactive elements?
The line N is at a wavelength of 590 nm. Calculate the frequency of this light in Hertz
Answer:
5.08 x 10¹⁴ Hz
Explanation:
To find the frequency, you need to use the following equation:
f = c / λ
In this equation,
-----> f = frequency (Hz)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> λ = wavelength (m)
After converting the wavelength from nm to m, you can plug the given values into the equation and solve for "f".
590 nm 1 m
---------------- x ------------------------ = 5.90 x 10⁻⁷ m
1 x 10⁹ nm
f = c / λ <----- Given equation
f = (3.00 x 10⁸ m/s) / (5.90 x 10⁻⁷ m) <----- Insert values
f = 5.08 x 10¹⁴ Hz <----- Divide
X If I want to measure the mass of a fly in metrics, What should I use
If want to measure the mass of a fly in metrics use a scale or a balance.
What is the most used metric system?The current international standard metric system and the one that is most generally used worldwide is the International System of Units (Système international d'unités, or SI). It is a development of Giorgi's MKSA system, with the meter, kilogram, second, ampere, kelvin, candela, and mole as its fundamental units.
What tool should you use to measure mass?A balance is used to estimate an object's mass for the majority of commonplace objects. The balance compares the target object to a known mass object. Digital scientific balances and beam balances, like a triple beam balance, are examples of several sorts of balances.
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what is the ph of a 0.0520 M solution of HI
Since hydroiodic acid is a strong acid and completely dissociates, we can use this formula:
pH = -log[H+]
pH = -log[0.0520]
pH = 1.284
Helpppp
Use the reaction below to solve this problem.
i need help with chemistry equation
Answer:
86400
Explanation:
24*24*69seconds
Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride:
S (s) + 3F2(g) → SF6 (g)
The maximum amount of SF6 that can be produced from the reaction of 32.1 g of sulfur with 114g of fluorine is ________ g.
Taking into account the reaction stoichiometry, the maximum amount of SF₆ that can be produced from the reaction of 32.1 g of sulfur with 114 g of fluorine is 146.46 grams.
Reaction stoichiometryIn first place, the balanced reaction is:
S + 3 F₂ → SF₆
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
S: 1 molesF₂: 3 molesSF₆: 1 moleThe molar mass of the compounds is:
S: 32 g/moleF₂: 19 g/moleSF₆: 146 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
S: 1 mole ×32 g/mole= 32 gramsF₂: 3 moles ×19 g/mole= 57 gramsSF₆: 1 mole ×146 g/mole= 146 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 57 grams of F₂ reacts with 32 grams of S, 114 grams of F₂ reacts with how much mass of S?
mass of F₂= (114 grams of F₂× 32 grams of S)÷ 57 grams of F₂
mass of F₂= 64 grams
But 64 grams of F₂ are not available, 32.1 grams are available. Since you have less mass than you need to react with 114 grams of F₂, S will be the limiting reagent.
Mass of SF₆ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of S form 146 grams of SF₆, 32.1 grams of S form how much mass of SF₆?
mass of SF₆= (32.1 grams of S× 146 grams of SF₆)÷ 32 grams of S
mass of SF₆= 146.46 grams
Finally, 146.46 grams of SF₆ can be produced from the reaction of 32.1 g of S with 114 g of F₂.
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If 4.02g of hydrogen and 32.00 of oxygen react completely to form water, what will be the mass of the water produced? Which scientific law dictates this?
Answer:
40.04g
Explanation:
the water has one molecule of hydrogen and two molecules of oxygen(H20)
(4.02)(2)(32)
I need help with the following question
The right answer is (KP)-1/2. Option A.
An expression of the equilibrium constant in terms of partial pressure is denoted as Kp. The equilibrium constant Kp is equal to the partial pressure of the product divided by the partial pressure of the reactant, and the partial pressure increases with a force equal to the coefficient of the substance in the equilibrium equation.
Kp is the equilibrium constant used to express equilibrium concentrations at atmospheric pressure and Kc is the equilibrium constant used to express equilibrium concentrations in molar terms. The relationship between Kp and Kc depends on the change in the number of moles of gaseous reactants and products. Kp has exactly the same form as Kc but partial pressure is used instead of concentration. Gases to the right of the formula are at the top of the print, and gases to the left are at the bottom.
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The atomic radius of carbon is 77 pm, and the atomic radius of sulfur is 103 pm. What is the circumference of each atom?
Answer:
Circumference of carbon = 483.56 pm
Circumference of sulphur = 1111.56 pm
Explanation:
The circumference is the length of any great circle, the intersection of the sphere with any plane passing through its centre.
For carbon atom:
Atomic radius = 77 pm
Circumference = 2πr
=2 X 3.14 X 77
=154 X 3.14
Circumference of C = 483.56 pm
For sulphur:
Atomic radius = 177 pm
Circumference = 2πr
=2 X 3.14 X 177 pm
=1111.56 pm
Circumference of sulphur = 1111.56 pm
Hence,
The circumference of Carbon is 483.56 and the circumference of sulphur is 1111.56 pm.
[tex]c \: = 2\pi\:r[/tex]
CARBONC = 2(3.14)(77)
C = 6.28 × 77
= 483.56SULFURC = 2(3.14)(103)
C = 6.28 × 103
= 646.84How is related the calorific capacity of a substance with its temperature?
The calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.
What is specific heat?Specific heat is defined as the heat required to raise the temperature of 1 gram of a substance by one degree.
Specific heat = q/(∆T × mass of the substance)
What is Heat capacity?Heat Capacity is defined as the amount of heat required to raise the temperature of the system by one degree.
Units of heat capacity :
The unit of heat capacity are joule/kelvin or joule/Celsius.
Heat capacity at constant volume = dU/dTHeat capacity at constant pressure = dH/dTThus, we concluded that the calorific capacity of a substance related to the temperature when specific heat of a substance ∆Q changes.
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