A quantum dot that emits yellow light with a wavelength of 537 nm. The total energy emitted is 223kJ.
Calculation:-
By Plank Einstein equation:
E = h \nu
h = 6.626×10-34Js
[tex]Also, we know, \lambda. \nu = c[/tex]
[tex]\lambda = 537 nm c = 3×108 m/s[/tex]
[tex]\nu = \frac{c}{\lambda }[/tex]
= (3× 108 m/s) ÷ 537×10-9 m
= 5.58× 1014 s-1
This photon will have the energy of:
E = 6.626×10-34 × 5.58×1014 J
= 3.701×10-19J
We know Avogadro's number,
1 mol = 6.022 × 1023 photons
The energy of 1 mole of photons :
= 3.701×10-19 J × 6.022× 1023
= 222914.9 J
= 223kJ.
The quantum dot size is inversely proportional to the bandgap energy level, thus changing the frequency of the emitted light and affecting its color. Smaller dots emit higher energy blue light while larger dots emit lower energy red light. The atomic arrangement near the surface differs from that near the center resulting in different electric fields and different manganese energy levels.
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what is the iupac name for the following compound? 1,2-bromocyclopentane b) (1r, 2s)-1,2-dibromocyclopentane c) (1s, 2s)-1,2-dibromocyclopentane d) (1s, 2r)-1,2-dibromocyclopentane e) (1r, 2r)-1,2-dibromocyclopentane
Answer:
It all depends if you were given an image of the 1,2-dibromocyclopentane
Explanation:
I've inserted an image of each compound.
Write the condensed ground-state electron configuration of the transition metal ion mn2+.
The condensed ground-state electron configuration of the transition metal ion [tex]Mn^{2+}[/tex] is [Ar] [tex]3d^{5}[/tex]
The electronic configuration of an element is the symbolic notation of the manner in which the electrons of its atoms are distributed in the periodic table over different atomic orbitals. While writing electron configurations, standardized rules are followed in which the energy level and the type of orbital are generally written first, followed by the number of electrons present in the orbital which is written in superscript.
In case of Manganese atomic number of the atom is 25. When we follow Aufbau principle the electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}[/tex] if we have to write it in a compact form we can write as [Ar][tex]3d^{5}4s^{2}[/tex]. In case of [tex]Mn^{2+}[/tex] we have to remove electron from the higher most orbital that is 4s so now the electronic configuration will be become [Ar][tex]3d^{5}[/tex].
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true or false? at the end of a precipitation reaction, you can recover (or obtain) the colored solid (the precipitate).
cOUNTS TOWARDS GRADE Write electron configurations for cations Key for entering electron configuration information Key for entering orbital box information u- electron with spin "up" Enter answer on one line WITHOUT superscripts Separate each subshell with a space d = electron with spin "down". Always start with spin up. Leave empty orbitals blank. Example: Neon (1s22s22p6) should be entered as 1s2 2s2 2p6 Write the electron configurations for the following ions using spectroscopic (spdf) and orbital box notation. (a) K+ Full electron configuration - (do not use noble gas notation) Orbital box notation: 1s 2 3s (b) Ti2+ Noble gas electron configuration - Orbital box notation: 3d Check & Submit Answer Show Approach
The full form of the electronic configurations are :
a) K⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶
b) Ti⁺² = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d²
a) the electronic configuration of potassium , K with atomic number 19 is as follows :
K = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
K⁺ ion losses one electron from the outermost shell.
K⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶
b) the electronic configuration of titanium , Ti with atomic number 22 is :
Ti = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²
Ti⁺² = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d²
Thus, The full form of the electronic configurations are :
a) K⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶
b) Ti⁺² = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d²
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Each period in the periodic table corresponds to a(n)___.a. principal energy levelb. energy sub-levelc. orbitald. suborbital
Each period in the periodic table corresponds to a(n) principal energy level.
What does the term "primary energy level" mean?
The electron's shell or orbital in relation to the atom's nucleus is referred to as its primary energy level in chemistry.
The primary quantum number n serves as a symbol for this level. A new main energy level is introduced by the first element of a period in the periodic table.Up to 2n2 electrons, where n is the total number of principal energy levels, may be present in any one level. As a result, each period in the periodic table correlates to a particular level of primary energy.Hence, Option a) principal energy level is correct answer.
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What is the density of NaOH in g mL?
1.110g mL⁻¹ is the density of a 3 molar solution of NaOH.
Sodium hydroxide, an inorganic substance with the formula NaOH, is also known as lye and caustic soda. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
Sodium hydroxide is a chemical that manufacturers utilize to make things like soap, rayon, paper, explosives, colors, and petroleum products. Processing cotton fabrics, metal cleaning and processing, electroplating, oxide coating, and electrolytic extraction are further uses for sodium hydroxide.
Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in soaps and cleansers. Sodium hydroxide is a white, odorless solid at ambient temperature.
Because sodium hydroxide is a potent base that entirely dissociates into hydroxide ions in solution, the initial concentration of sodium hydroxide is the same as the first concentration of hydroxide ions in solution.
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65 g of nitric acid are produced in a reaction. 2. 5 g of platinum are added to the reaction vessel at the start of the reaction to act as a catalyst. How much platinum will there be left in the vessel at the end of the reaction?.
2..5 grams of platinum will be there at the end of the reaction, because Platinum is the catalyst here.
Catalyst is a substance that can be added to a chemical reaction to increase the rate of reaction without getting itself consumed in the reaction. It just acts as a driving force for the reaction and it itself does not take part in the chemical reaction.
Catalysts basically speeds up a reaction by reducing the activation energy or also by changing the reaction mechanism. Enzymes are proteins that act as catalysts in the biological systems.
In the above given question if 2.5 grams of platinum is added to the reaction vessel then at the end of the reaction 2.5 grams of platinum itself will be remaining because it acts as a catalyst here.
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If metals and non-metals make bonds and non-metals and non-metals make bonds, can metals and metals do the same? How?
The metals loses electrons forming cations while on the other hand, the non-metals gains the electrons forming anions.
What happens when non-metals bond with non-metals?Covalent bonding is a type of bonding linking two non-metallic atoms which are distinguished by the sharing of pairs of electrons joining atoms and other covalent bonds. An ionic bond is the force of appeal that holds together positive and negative ions. It forms when atoms of a metallic element loses electrons to atoms of a nonmetallic element. Ionic bonds form only allying metals and nonmetals. When two nonmetals bond, they share pairs of electrons in a covalent bond and both gets stability.
So w can conclude that A covalent bond is formed between two non-metals. The sharing of electron pairs takes place between their atoms and a covalent bond is formed.
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periodic trends worksheet 1. indicate whether the following trends increase or decrease as you move from left to right across the periodic table. a. atomic radius b. first ionization energy c. electronegativity (excluding noble gases) 2. indicate whether the following trends increase or decrease as you move down a column of the periodic table.
The atomic radius will be decreases then the first ionization energy will increases and electronegativity will increases from left to right across the periodic table
The horizontal rows in the periodic table are periodsSo when we move from left to right in the period the number of electron and effective nuclear charge increases due to which the following properties are increasesElectronegativity is an ability of an atom to attract shared pair of electron toward itselfFirst ionization enthalpy is an amount of energy required to remove an outermost electron from an isolated gaseous atom in its ground stateElectron affinity is an amount of energy released when an electron is added to a neutral atom or molecule to form a negative ionThe atomic radius of the element decreases on moving left to right in a period due to high nuclear charge electron is highly attracted toward the nucleusSo that atomic radius will be decreases then the first ionization energy will increases and electronegativity will increases from left to right across the periodic table
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Give a test to distinguish between soaps and detergents
Answer:
Soap and detergent can be distinguished in hard water. Soap reacts with hard water and forms come but detergents does not react with hard water.
Source: Brainly User
When determining the mass of an atom, the electrons are not considered. Why can scientists disregard the electrons?.
The electrons are so much lighter than the protons and neutrons that they don't contribute much to the atom's mass.
What is atom's mass?
An atom's mass is its atomic mass (ma or m). Atomic mass is frequently stated in the non-SI unit dalton (symbol: Da), or unified atomic mass unit, even though the SI unit of mass is the kilogram (symbol: kg) (u). One Da is equal to one-twelfth of the mass of a free carbon-12 atom in its ground state. Nearly majority of an atom's mass is made up of its protons and neutrons, with the electrons and nuclear binding energy making up the remainder. As a result, the atomic mass has a value that is virtually identical to the mass number when given in daltons.
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A mixture of 82.4 g of aluminum (M=26.98 g/mol) and 117.65 g of oxygen (M=32.00 g/mol)
is allowed to react.
a) Identify the limiting reactant.
b) Calculate the mass of aluminum oxide formed.
c) Determine the mass of the excess reactant present in the vessel when the reaction is
complete.
d) What is the percentage yield for the reaction if reaction mixture produce 120 g of
aluminum oxide?
The balance chemical equation would be,
[tex]2Al+3O_{2}[/tex] ------------->[tex]Al_{2}O_{3}[/tex]
The limiting reactant would be Aluminium here.
Here,
107.92 g Al would be required = 96 g of O₂
Therefore,
82.49 g of Al might require = x g of O₂
Solving for x,
x = (82.49 g × 96 g) / 107.92 g
x = 73.37 g of O₂
The mass of the excess reactant present in the vessel when the reaction is completed is 73.37g.
But,
[tex]O_{2}[/tex] is supplied in excess, as we get 117.65 g of it, and 44.28 g of it will not be reacted.
The amount of [tex]Al_{2}O_{3}[/tex] formed would be solved as,
107.92 g of Al produced in reaction = 203.92 g of [tex]Al_{2}O_{3}[/tex]
Then,
82.49 g of Al would produce = x g of [tex]Al_{2}O_{3}[/tex]
Solving for getting x,
x = (82.49 g × 203.92 g) / 107.92
x = 155.86 g of [tex]Al_{2}O_{3}[/tex]
Therefore the mass of aluminum oxide formed would be 155.86g.
%yield= (experimental mass of product/theoretical mass of product)×100
The theoretical mass of the product is already calculated above which is 155.86g and the experimental mass of the product is given as 120g. Therefore,
(120/155.86)×100
=76.99
The percentage yield for the reaction if the reaction mixture produces 120 g of aluminum oxide would be 76.99%.
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Reasons as to why the carbon electrodes require continual Reasons as to why the carbon electrodes require continual replacement
Carbon electrodes are changed frequently in electrolysis as the carbon in the carbon electrodes burns to give out Carbon-di-oxide.
Carbon electrodes are used in electrolysis to facilitate the transfer of electrons between the anode and the cathode. The carbon electrode is usually in the form of a rod or plate and is electrically connected to the anode.
The carbon electrode may also be used to help reduce the overall resistance of the electrolytic cell.
Carbon electrodes are used in electrolysis because they are chemically inert and have a high electrical conductivity.
However, carbon electrodes must be changed frequently because they become corroded and lose their electrical conductivity over time.
This is because carbon burns out in the Carbon electrodes to give out Carbon-di-oxide. That is why the carbon anodes should be changed frequently.
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optical brighteners are synthetic chemicals that make fabrics appear to glow in the presence of ultraviolet light. these optical brightening agents reacts with the yellowish color in the fabric and increases the reflection of blue light radiation. true false
The optical brightener absorbs the UV rays.
What is optical brighteners?
Because of the way they reflect light, optical brightening, also known as optical bleaches, are finishes that produce the appearance of extreme whiteness and brightness. These substances contain fluorescent colorless dyes, which increases the reflection of blue light.
What is reflection?
When light reflects off of something, it happens. The light will reflect at the same angle from a smooth and shining surface, such as glass, water, or polished metal.
Chemical compounds known as optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), absorb light in the ultraviolet and violet region of the electromagnetic spectrum (typically between 340 and 370 nm) and then fluoresce, reemitting light in the blue region of the spectrum (typically between 420 and 470 nm).
These additives have a "whitening" effect, which makes naturally yellow-orange materials appear less yellow or orange by making up for the lack of blue and purple light reflection by the substance's fluorophore's optical emission, which is blue and purple.
Therefore, we can conclude that it is true.
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n this project, you will build a simple unix shell to replace sh provided by the linux kernel. the shell is the command-line interface, and thus central to any unix/c programming environment. mastering use of the shell is necessary to become proficient in this world; knowing how the shell itself is built is the focus of this project. there are three specific objectives for this assignment:
Any unix/c programming environment's command-line interface, or shell, is essential. To succeed in this world, one must learn how to use the shell effectively.
int main (int argc, char **argv)
{
while (1){
int childPid;
char * cmdLine;
printPrompt();
cmdLine= readCommandLine();
//or GNU readline("");
cmd = parseCommand(cmdLine);
command is record in list of history(GNU readline history ?)
if ( isBuiltInCommand(cmd)){
executeBuiltInCommand(cmd);
}
else {
childPid = fork();
if (childPid == 0){
executeCommand(cmd); //calls execvp
} else {
if (isBackgroundJob(cmd)){
record in list of background jobs
} else {
waitpid (childPid);
}
}
}
}
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A pipet is used to transfer 5.00 mL of a 1.25 M stock solution in flask "S" to a 25.00-mL volumetric flask "B," which is then diluted with DI H20 to the calibration mark. The solution is thoroughly mixed. Next, 2.00 mL of the solution in volumetric flask "A" is transferred by pipet to a 50.00-ml volumetric flask "B" and then diluted with DI H20 to the calibration mark. Calculate the molarity of the solution in vol- umetric flask "B."
The molarity of the solution in the volumetric flask B is 0.0100 M.
This problem is solved firstly by using the concept of dilution formula which can be written as below:
M1V1 = M2V2
Given,
M1 = 1.25 M
V1 = 5 ml
V2 = 25 ml
By substituting all the values, we get
1.25 × 5 = M2 × 25 ml
M2 = 1.25 × 5 / 25
M2 = 0.25 M
Now,
Volume of solution pipet from volumetric flask A V2 = 2 ml
Molarity of solution in volumetric flask 'A' = 0.25 M = M2
Volume Volume of solution in volumetric flask B (V3) = 50 ml
Again by using dilution formula,
M2V2 = M3V3
By substituting all the values, we get
0.25 × 2 = M3 × 50 ml
M3 = 0.0100 M
Thus, we concluded that the molarity of the solution in the volumetric flask B is 0.0100 M.
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Match the formula to the correct name.
Column A
1.
Al2O3
:
Al2O3
2.
Al(HCO3)3
:
Al(HCO3)3
3.
Al2(CO3)3
:
Al2(CO3)3
Column B
a.
Aluminum oxide
b.
Aluminum carbonate
c.
Aluminum bicarbonate
[tex]Al_2O_3[/tex] is aluminum oxide
[tex]Al_2(CO_3)_2[/tex] is aluminum carbonate
[tex]Al(HCO_3)_3[/tex] is aluminum bicarbonate
Chemical formulasThe chemical formula of a compound is derived from the component elements in their symbolic forms. Thus, from the name of a compound, we are likely to know the component elements present in the compound.
In other words, aluminum oxide compounds will contain aluminum and oxygen, while aluminum carbonate compounds will contain aluminum and a carbonate ion.
The component elements will combine using their respective valence electrons to make bonds and produce compounds.
Thus, the chemical formulas given in the illustration and their matching names would be as follows:
[tex]Al_2O_3[/tex] = aluminum oxide
[tex]Al_2(CO_3)_2[/tex] = aluminum carbonate
[tex]Al(HCO_3)_3[/tex] = aluminum bicarbonate
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In the gravimetric method, is it important that you dissolve your sample in exactly 10 mL of water? Why or why not?
In the gravimetric method, it is important that you dissolve your sample in exactly 10 mL of water. A quantitative technique called gravimetric analysis uses the material to be measured to be selectively precipitated out of an aqueous solution.
What is gravimetric method ?With six-figure precision, it is used to calculate the atomic masses of several elements. It doesn't call for a set of criteria to calculate an unknown and leaves minimal space for instrumental mistake.
Precipitation of either the examined substance's cation or anion is required. The chemical under investigation must have an anion to cation ratio of 1:1. The material under investigation's cation and anion must both be precipitated.
A quantitative technique called gravimetric analysis uses the material to be measured to be selectively precipitated out of an aqueous solution. Filtration is used to remove the precipitate from the residual aqueous solution, and it is then weighed.
Thus, In the gravimetric method, it is important that you dissolve your sample in exactly 10 mL of water.
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an optically active compound with molecular formula c8h14 undergoes catalytic hydrogenation to give an optically inactive product. which of the following structures are consistent with all the data? compound a is a 6 carbon ring with a wedged bond to methyl on carbons 1 and 4 and a double bond between carbons 2 and 3. compound b is a 6 carbon ring with a wedged bond to methyl on carbon 1 and a dashed bond to methyl on carbon 4. there is a double bond betweeen carbons 2 and 3. compound c is a 6 carbon ring with a wedged bond to methyl on carbon 1 and a double bond between carbons 3 and 4. there is a methyl substituent on carbon 4. compound d is a 6 carbon ring with a wedged bond to methyl on carbon 1 and a dashed bond to methyl on carbon 5. there is a double bond between carbons 2 and 3. compound e is a 5 carbon ring with a double bond between carbons 1 and 2. there is a methyl substituent on carbons 1, 2 and 4. select the compounds that match the data.
Any compound that possesses a plane of symmetry in any conformation will be achiral. Achiral molecules are optically inactive.
(a) The reactant and the product formed on catalytic dehydrogenation of the reactant are as follows:
Reactant Cat.[tex]H_{2}[/tex] Product
Both the reactant and the product are optically inactive due to the presence of a plane of symmetry.
A compound may be optically active if it contains at least one asymmetric carbon atom or chiral center. Due to the presence of symmetry elements, the complex has no optical isomers. Optical isomerism is a form of stereoisomerism in which isomers have the same molecular and structural formula but different directions of rotation for linearly polarized light.
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who pictured atoms as tiny indestructible particles with no internal structure? group of answer choices john dalton jj thompson hantaro nagaoka ernest rutherford
According to John Dalton, atoms are tiny, unbreakable particles without any internal organization.
What substances make up atoms?Protons, neutrons, & electrons are three incredibly small subatomic particles that make up an atom. The nucleus, which is made up of protons and neutrons, sits in the middle of an atom, and an electron cloud flies around it.
The size of an atomThe typical radius of an atom is 0.1 nm. An average pin head may hold about 5 million hydrogen. An atom's nucleus is 10,000 orders of magnitude smaller than the nucleus itself. The nucleus of an atom would be the diameter of a garden pea if it were the size as Wembley Stadium.
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Consider the substitution reaction that takes place when (R)-3-bromo-3-methylhexane is treated with methanol. Which of the following would be true? A) The reaction would take place only with inversion of configuration at the stereogenic center. B) The reaction would take place only with retention of configuration at the stereogenic center. C) The reaction would take place with racemization. D) No reaction would take place. E) The alkyl halide does not possess a stereogenic center. a. А b. B c. C d. D e. Е
The reaction would take place with racemization. Option C.
The reaction between (s)-3-Bromo-3-methyl hexane and water is a nucleophilic substitution reaction as the leaving group present on the substrate is displaced by a nucleophile. Water is a polar protic solvent and he prefers SN1 reactions over SN2 reactions. Therefore, the reaction mechanism is SN1.
The carbocation and its substituents are all in the same plane. In other words, the nucleophile can attack from either side. As a result, both enantiomers are formed in the SN1 reaction, producing a racemic mixture of both enantiomers. Alkenes react with pure liquid bromine at low temperatures or with solutions of bromine in organic solvents such as carbon tetrachloride. The double bond is broken and a bromine atom is attached to each carbon atom.
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what is the wavelength of 1.28x10^17HZ
lab report: acids, bases, salts and strong acid titration results: part 1: ka of the unknown weak acid calculations: data analysis: 1. calculate the [h3o ] using php. [h3o ]
First determine Ka of an unknown acid by measuring the pH of the pure acid is 5.
Next titration the acid to find what volume of base is needed to neutralize it completely.
The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH.
calculation:-
Ka of the unknown weak acid = 1.5 × 10^5
pH = -log[1.5 × 10^5]
= 5
The acid dissociation constant Ka is used to distinguish strong acids from susceptible acids. Strong acids have especially high Ka values. The Ka fee is located by looking at the equilibrium constant for the dissociation of the acid. The better the Ka, the more the acid dissociates.
The acid Ka is used to differentiate strong acids from weak acids. Sturdy acids have noticeably high Ka values. The Ka cost is found by searching on the equilibrium consistent for the dissociation of the acid. The higher the Ka, the extra the acid dissociates.
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Disclaimer:- your question is incomplete,please see below for the complete question.
Lab report: acids, bases, salts and strong acid titration results: part 1: ka of the unknown weak acid calculations: data analysis: 1. calculate the [h3o ] using php. [h3o ].
a sealed rigid vessel contains bao2(s) in equilibrium with bao(s) and o2(g) as represented by the equation above. which of the following changes will increase the amount of bao2(s) in the vessel?
In this case , Removing a small amount of BaO will increase the amount of bao2(s) in the vessel.
What do you mean by Barium oxide ?
Barium oxide , BaO. Barium oxide is found to be white and is non-flammable. It is mostly used in cathode ray tubes, catalysts, crown glass, and solvent-killing agents because of its cubic structure. Sir Humphry Davy was known as the discovered. Barium oxide has a total monoisotopic mass of 153.9 g/mol.
Uses of Barium oxide is used in the isomer separation process.
It is widely used in the production of fuel and as a reducing agent.It is a fantastic oxidising agent.Hence, In this case , Removing a small amount of BaO will increase the amount of bao2(s) in the vessel.
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A cycle consists of a carefully balanced set of molecules. In order for the cycle to continue, this balance must be maintained. How many turns of the calvin cycle must occur before one molecule of g3p can leave?.
The Calvin cycle must occur before one molecule of g3p can leave is 3.
Making a G3P molecule requires three Calvin cycles allowing the G3P molecule to exit the cycle and continue making glucose. He needs all three requirements: chlorophyll pigment, chloroplast "theater", and enzyme catalysis. The first stage converts light energy into chemical energy, which is stored in ATP and NADPH molecules until this point.
In the second step of the Calvin Cycle, the carbon-fixed 3-PGA molecule is converted to the monosaccharide molecule, glyceraldehyde-3-phosphate. This stage uses energy from ATP and NADPH produced in the light-dependent reactions of photosynthesis. The Calvin Cycle harnesses the chemical energy of ATP and reduces the power of NADPH from a light-dependent reaction to produce a tricarbonate.
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Balanced equation
Fe + HCI --> FeCl2 + H2
Answer:
the balanced form is: Fe + 2HCl --> FeCl2 + H2
Is there a chemical element beginning with J?
Answer:The Letter J on the Periodic Table. The letter J was the element symbol for iodine in Mendeleev's 1871 periodic table. You won't find the letter “J” on the IUPAC periodic table of the element
Explanation:
There is no such element beginning with J in the periodic table.
What is an element?
A chemical element is a type of atom with a particular number of protons in the nucleus, such as the specific compound made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is an element's defining attribute, and it is symbolised by the symbol Z - all atoms with the same atomic number are atoms of the same element. Atoms are rearranged into new compounds linked together by chemical bonds when various elements undergo chemical reactions.
There is no such element beginning with J in the periodic table.
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which of the following are spontaneous processes? 1. ice melting at 1atm and 298 k (assume only ice is initially present). 2. heat flowing from a hot object to a cold object. 3. an iron bar rusting. a) 1 only b) 2 only c) 3 only d) 1 and 3 only e) 1, 2, and 3
1,2 and 3 are spontaneous processes.
What is a spontaneous process?
A spontaneous process in thermodynamics is one that happens without any external input to the system. A system's time-evolution to a lower, more thermodynamically stable energy state as it releases free energy is a more precise definition (closer to thermodynamic equilibrium).
In accordance with the usual practice for thermodynamic measurements, a release of free energy from the system corresponds to a negative change in the system's free energy and a positive change in the environment's free energy. The free energy is calculated in several ways depending on the process's characteristics. Spontaneous processes are characterized by a rise in entropy in situations when no energy is exchanged with the environment.Energy is liberated when ice is melting at 1atm and 298 k.In case of heat flowing from a hot object to a cold object no external energy input is required.Even though iron rusting is a gradual process, it always moves in the same direction. We refer to the rusting of iron as a natural process. Iron is oxidized to iron (III) oxide during the rusting process.Hence, 1,2 and 3 are spontaneous processes.
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Measurements have shown that the concentration of salt in seawater is 35.5 g-L. Calculate the volume in liters of seawater that must be evaporated to recover 0.400 kg of salt. Be sure your answer has the correct number of significant digits
Answer:
Measurements have shown that the concentration of salt in seawater is 35.5 g-L. Calculate the volume in liters of seawater that must be evaporated to recover 0.400 kg of salt. Be sure your answer has the correct number of significant digits
The concentration of a solution can be expressed in several methods like molarity, molality, mass percentage, etc. The volume in liters of the seawater is 11.267 L.
What is volume?The measure of the capacity that an object holds is defined as the volume. If a beaker can hold 100 mL water then its volume is 100. The ratio of the mass to density of a substance is the volume.
It can be expressed in mL, L, m³, cm³, etc. The SI unit of volume is m³. The equation used to determine the volume is:
Volume = Mass / Density
1 kg = 1000 g
0.400 kg = 0.400 × 1000 = 400 g
Then the volume in liters of seawater that must be evaporated to recover 0.400 kg of salt is:
V = 400/35.5 = 11.267 L
Thus the volume of seawater is 11.267 L.
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What is the density of a chess piece in grams and in cm3?
The density of the lead chess piece with the mass of 51.4 and 55 ml is 0.93 g/cm³, since 1 ml = 1 cm³.
What is density?Density of a substance is the ratio of its mass by volume it is the measure of how much denser it is in a particular volume. The ratio of the density of an object to the density of water is called specific gravity.
Given that the volume of the chess piece is 55 ml or 55 cm³ and mass is 51.4 g. Hence density can be find out as follows:
Density = mass/ volume
= 51.4 g/55 cm³
= 0.93 g/cm³
Hence, density of the lead chess piece is 0.93 g/cm³.
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Your question is incomplete. But your complete question probably was:
What is the density of a lead chess piece with a mass of 51.4 and 55 ml in volume?