Answer:
The energy is released/harnessed in the form of an electrical current.
Explanation:
The concept of a fuel cell is to harvest the energy of the H2 + O2 reaction in the form of electrical current, not as light, heat, and sound. Although energy in the light, heat, and sound provide a higher entertainment value, the electricity produced in a fuel cell proves useful in powering computers, electric cars, phones, televisions, toasters, and other electrical and electronic devices. The TV, phone, and computer provide substitute entertainment.
The amount of energy released is the same. It is simply in a different form.
Follow-Up:
1. Rate is a ratio of two different kinds of measurements. Speed, for example, is a rate that depends on
the value of both distance and time. Rates, such as speed, are typically calculated by dividing one
measurement by another. Rates do not have to be related to speed. Another example of a rate
would be the price per dozen for the cost of eggs. What are at least two other examples of rates?
Describe the two measurements needed to determine those rates.
the rate constant for a reaction at 40.0oc is exactly three times that at 20.0oc. calculate the activation energy for the reaction. report your answer in kj/mol.
The activation energy for the reaction is 4.187 x 10⁴ J/mol.
The reaction's starting point temperature is 40.0° C
T' = 20.0° C is the reaction's final temperature.
Initial temperature's rate constant is three times higher than final temperature's.
The relationship between the Arrhenius energy and the rate constant is the basis of the presented problem. And the mathematical expression is as follows:
ln k'/k = (Eₐ/R) x (1/T-1/T')
The universal gas constant, R, is used here. And is the activation's Arrhenius energy.
As stated in the issue,
K'/k = 3
Solving as,
ln k'/k = (Eₐ/R) x (1/T-1/T')
ln 3 = (Eₐ/8.134) x (1/293-1/313)
1.098 = (Eₐ/8.134) x2.18 x10⁻⁴
Eₐ = 4.187x 10⁻⁴ J
Thus, it follows that the required amount of activation energy for the specified reaction is 4.187x 10⁻⁴ J.
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conclusions: how do the results for methane compare to those for butane? does your experimental data verify charles's law?
The rule of conservation of mass only holds when the combined masses of the reactants and products are equal. As a result, if we know the masses of one reactant and one product, we can calculate the masses of the other reactant and product.
We know that the reactants in this case have beginning concentrations of 25.0 g of lithium and 25.0 g of bromine. The molar mass of lithium is 6.939 g/mol, whereas the molar mass of bromine is 159.808 g/mol.
In order to convert the mass of any material into a unit of moles the temperature and volume of methane and butane must be measured and recorded at various pressures and temperatures in an experiment to confirm Charles's Law. The data from the experiment must then be analyzed to determine whether the relationship between temperature and volume is direct and linear, as predicted by Charles's Law.
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In the compound, A is the ___, B is the ____, C is the ___.
Multiple choices:
-Hydrate
-Anhydrate
-Waters of hydration
The highlighted parts of the compound are;
A - Anhydrate
B - Waters of hydration
C - Hydrate
What is a hydrated compound?We know that a compound can be said to be hydrated if the compound does contain a water of crystallization. The implication of this is that If we have a compound that has a certain specified number of water molecules attached to it, we can say that the compound is hydrated.
The anhydrous compound is the compound that has lost its water of crystallization. We can tell that for the compound that we have, there is a water of hydration attached.
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How much change in temperature would the addition of 39,231J of heat have on a 532g sample of copper?
which chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs?
The chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs is Mesolimbic dopamine pathway.
The reinforcing and addictive qualities of substances like nicotine are greatly influenced by the mesolimbic dopamine system.
Dopamine serves a variety of functions and is both a neurotransmitter and a hormone.
These mesolimbic pathways aid in the distribution of dopamine throughout the body. The nucleus accumbens receives dopamine from the ventral tegmental region via the mesolimbic dopamine pathways.
Dopamine produces a sense of reward and pleasure in the nucleus accumbens.
Dopamine flows from the ventral tegmental region to the nucleus accumbens anytime there is a sense of rewarding or pleasurable stimuli. Dopamine provides a sense of positive feeling, which leads to addictive behavior ( ie, drugs).
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estimate the specific gravities (gas) for methane and propane. their molecular weights are shown inside the back cover or in the book appendices. (commercial natural gas and commercial propane are mostly methane and propane, with small amounts of other substances, which may be ignored for this problem.) which is more dangerous, a propane leak or a methane leak? why?
The specific gravity of methane is 0.554 and the specific gravity of propane is 1.52.
The specific gravity of a gas can be calculated using the formula:
Molecular Weight of Gas / Molecular Weight of Air = Specific Gravity
For methane:
Molecular weight of methane = 16.04 g/mol
Molecular weight of air = 28.97 g/mol
Specific Gravity = 16.04 g/mol / 28.97 g/mol = 0.554
For propane:
Molecular weight of propane = 44.10 g/mol
Molecular weight of air = 28.97 g/mol
Specific Gravity = 44.10 g/mol / 28.97 g/mol = 1.52
A propane leak is more dangerous than a methane leak because propane is heavier than air, so it sinks and can collect in low-lying areas such as basements and crawl spaces, where it can be ignited by a spark or flame. Methane, on the other hand, is lighter than air and tends to rise, making it less likely to accumulate in dangerous concentrations. Additionally, propane is more explosive than methane, so a propane leak can result in a larger and more destructive explosion.
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the complete question is :
Estimate the methane and propane-specific gravities (gas). 16.04 and 44.10 molecular weights respectively. (In commercial natural gas and propane, the main components are methane and propane; minor amounts of other compounds may be disregarded for this issue.) A propane leak or a methane leak, which is more hazardous? why?
the density of gold is 19.3 g/ml. what is the volume of a gold nugget that weighs 67.0 g? write your numerical answer without unit inside the box. the answer should be in three significant figures and in standard not scientific notation.
The volume of a gold nugget that weighs 67.0 g is 3.47 mL
The relationship between an object's mass and the volume it occupies is known as its density. This means that if an object's volume increases but its mass remains constant, its density will decrease.
We use the equation: to determine the mass of the solution.
ρ = m/V
whre,
ρ = density
m= mass
v= volume
so,
V= m/ρ
We receive:
Gold mass =67.0 grams.
Gold has a density of 19.3 g/mL.
Using the values in the equation above, we obtain:
V= m/ρ
V = 67.0 grams./ 19.3 g/mL.
V= 3.47 mL
Consequently, the gold nugget's volume is 3.47 mL
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what is the process of splitting a uranium atom called?
Answer:
Nuclear fission
A body is accelerated continuously. What is the form of the graph?
A. cubic
B. inverse
C. linear
D. quadratic
Answer:
B: Inverse
Explanation:
what is the entropy of this collection of training examples with respect to the target function classification?
Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.
A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.
Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.
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HNO3 + H3PO3 → NO + H₂PO4+H₂O (Acidic)
What is the complete step by step oxidation reduction reaction?
Answer:
The reaction provided is not a redox reaction. The equation shows the neutralization reaction between Nitric acid (HNO3) and Phosphoric acid (H3PO3) to produce Nitrogen monoxide (NO), Dihydrogen Phosphate (H2PO4) and water (H2O).
When two or more acids are mixed together, they can neutralize each other. This is called a neutralization reaction. The acid and the base will react to form a salt and water. In this case, Nitric acid is the acid and Phosphoric acid is the base.
The equation for this neutralization reaction can be balanced as follows:
HNO3 + H3PO3 → NO + H2PO4 + H2O
Where HNO3 = Nitric acid
H3PO3 = Phosphoric acid
NO = Nitrogen monoxide
H2PO4 = Dihydrogen Phosphate
H2O = water
The reaction is acidic in nature due to the presence of H+ ions in the products.
In summary, the reaction provided is a neutralization reaction, not a redox reaction. The equation shows that Nitric acid and Phosphoric acid neutralize each other to form Nitrogen monoxide, Dihydrogen Phosphate and water. The reaction is
methyl isocyanate reacts with strong acids, such as sulfuric acid, to form a cation. for protonation on , which resonance contributor is most important?
The resonance contributor that is most important for protonation in methyl isocyanate is the one in which the nitrogen atom is double-bonded to the carbon atom, and has a formal positive charge, this is called a carbocation or a carbenium ion.
This resonance contributor is considered the most important because it shows the nitrogen atom with the greatest electron density, making it more susceptible to protonation.
In the reaction of methyl isocyanate with strong acids, such as sulfuric acid, the protonation occurs on the nitrogen atom of the molecule. The protonation process is determined by the relative acidity of the nitrogen atom and its electron-withdrawing groups, and thus the resonance contributor that is most important for the protonation is the one that shows the nitrogen atom with the greatest electron density.
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an empty container with a volume of 160.0 cm3 is weighed and found to have a mass of 72.3 g. the container is filled with a liquid and reweighed. the mass of the container and the liquid is 199.9 g. what is the density of the liquid to the appropriate number of significant figures?
An empty container with a volume of 160.0 cm³ is weighed and found to have a mass of 72.3 g. The density of the liquid is 0.797 g/ cm³.
The Mass of empty container = 72.3 g
The Mass of container + Liquid = 199.9 g
The Mass of Liquid =?
The Mass of Liquid = (Mass of container + Liquid) – (Mass of the empty
container)
The Mass of Liquid = 199.9 - 72.3
The Mass of Liquid = 127.6 g
The volume = 160 cm³
The density is given as:
Density = mass / volume
Density = 127.6 / 160
Density = 0.797 g/cm³
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How many milligrams are in 5.7 grams
Answer:
5700 milligrams
Explanation:
To go to a smaller unit you move the decimal to the right.
a fictitious element z has an average atomic mass of 223.13 u. element z has two naturally occuring isotopes. the more abundant isotope has an exact mass of 224.75 u and a relative abundance of 62.94%. calculate the exact mass of the second isotope.
The exact mass of the second isotope is 224.15 u
The following equation can be used to get the average atomic mass:
average atomic mass = (% of the first isotope/100) x mass of the first isotope+ (% of the second isotope/100) x mass of the second isotope)
Due to this:
Initially isotope:
% = 62.94 %
Mass = 224.75 u
The second isotope is:
Since there are only two isotopes of the element, the second percentage is equal to 100 minus the first percentage.
% = 100 % - 62.94 % = 37.06 %
Assume Mass = x u.
Average Mass = 223.13 u, as stated
Thus,
average atomic mass = (% of the first isotope/100) x mass of the first isotope+ (% of the second isotope/100) x mass of the second isotope)
223.13 = (62.94 % x 224.75) +( 37.06 % x 223.13 )
100 100
When we solve for x, we obtain:
x = 224.15 u
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Each of the given reactions is catalyzed by an enzyme. For each reaction, classify the enzyme according to one of the six categories suggested by the International Union of Biochemistry. Consider the reaction. H 2 O + A dipeptide and water forms two amino acids. Which category does the catalyzing enzyme belong to?
Considering the given reaction, H 2 O + A dipeptide and water forms two amino acids, hydrolase category does the catalyzing enzyme belongs.
The catalyzing enzyme in the reaction H2O + A dipeptide → two amino acids belongs to the Hydrolase category. This is because the enzyme catalyzes the hydrolysis of a dipeptide, which involves the addition of water (H2O) to the dipeptide to form two amino acids. Hydrolases are enzymes that catalyze the hydrolysis of various types of biological molecules, such as carbohydrates, lipids, and nucleic acids.
1. Esterases, which catalyze the hydrolysis of esters, breaking the bond between the carboxyl and alcohol groups.
2. Lipases, which catalyze the hydrolysis of lipids, breaking the bond between the glycerol and fatty acid groups.
3. Peptidases, which catalyze the hydrolysis of peptides, breaking the bond between the amino acids.
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a separation process that depends on differing abilities of substances to form gases is called .
A separation process that depends on differing abilities of substances to form gases is called Distillation.
Distillation is a common method used to separate and purify liquids based on their different boiling points. The process involves heating a mixture of liquids to a temperature where one liquid will evaporate and form a vapor, while the other liquids will remain in a liquid state. The vapor is then condensed back into a liquid form and collected, which is then called the distillate. The distillate will be the liquid with the lowest boiling point of all the components in the mixture. This process can be repeated for different boiling point ranges and those multiple distillates will be different components of the original mixture.
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a student mixes 50.0 ml of 0.10 m pb(no3)2 solution with 50.0 ml of 0.10 m kcl. a white precipitate forms, and the concentration of the chloride ion becomes very small. which list places the concentrations of the remaining ions in order of decreasing concentration?
[ NO3-] > [K+] > [Pb2+] is correctly places the concentrations of the remaining ions in order of decreasing concentration.
As from the given data, we know that,
Pb(NO3)2 + 2KCl = PbCl2 + 2KNO3
we know,
Pb(NO3)2= 0.005mol
2KCL = 0.005mol
PbCl2 = 0.0025mol
2KNO3 = 0.005mol
SO,
K+ and NO3- spectators 2NO3- for each K+
Pb and K+ are equal but some Pb precipitate
Hence, giving the concentration order as,
[ NO3-] > [K+] > [Pb2+] and the concentration of the chloride ion becomes very small and hence it is negligible.
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4NH3 +5O2→4NO+6H2O (Run at constant temperature and pressure)
If 3.20 liters of ammonia gas are reacted, how many liters of oxygen gas are consumed?
a
3.20 L O2
b
4.00 L O2
c
2.56 L O2
If 3.20 liters of ammonia gas reacts, the amount of oxygen gas that will be consumed is 4L of oxygen gas (option B).
How to calculate volume using stoichiometry?Stoichiometry refers to the quantitative relationship between the reactants and products of a specific reaction or equation.
According to this question, ammonia gas reacts with oxygen gas to produce nitrogen oxide and water as follows:
4NH₃ + 5O₂ → 4NO + 6H₂O
Based on the above equation, 4 moles of ammonia gas reacts with 5 moles of oxygen gas.
This means that 3.2 litres of ammonia gas will react with 3.2 × 5/4 = 4 litres of oxygen gas.
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identify tools that are ideal for cleaning glassware.
tools that are ideal for cleaning glassware Brushes and Detergent
Scrub the interior of curved glassware with warm tap water and a brush dipped in soapy water. You can flush the sink with this waste water. To avoid severe water stains, detergents, remove soap suds with deionized water. Pouring the DI water rinse through clean glassware should result in a smooth sheet. According to the University of Wisconsin Office of Chemical Safety, acid solutions such fuming sulfuric acid, diluted sulfuric acid, chromic acid solution, piranha solution, and aqua regia (a blend of nitric acid and hydrochloric acid) are used to clean laboratory glassware.
identify tools that are ideal for cleaning glassware.
1. reusable clothes
2.brushes
3. detergents
4. steel wool water
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Which two changes would decrease the gravitational force between two objects?
Decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
What is gravitational force?The concept of gravitational force is described by Newton's Law of Universal Gravitation. This gravitational force is indeed a form of non-contact force; it is a constant attracting and constrictive force in nature.
The attraction force felt by two or even more objects into contact is known as gravitational force. The Gravitational Force Formula, which was derived from Newton's Universal Law of Gravitation, is used to calculate the gravitational force.
F=GmM/r²
From formula we can see that decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
Therefore, decreasing mass and increasing distance between two objects decrease the gravitational force between two objects.
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which bonds are covalent bonds? question 19 options: a) peptide bonds b) glycosidic bonds c) phosphodiester bonds d) all of these choices are correct.
Peptide bonds, glycosidic bonds, phosphodiester bonds are covalent bonds.
A covalent bond is formed by the equal sharing of electrons by two atoms.
The bond which is formed between the first carbon atom of one monosaccharide with the four carbon atoms present in the neighboring monosaccharide unit and, which results in the formation of a polysaccharide unit is known as a Glycosidic bond. In the formation of this bond, a water molecule is released as a by-product.
A covalent bond which is formed between the carboxyl group of one amino acid and the amino group of the neighboring amino acids, is known as a peptide bond. This bond formation involves release of a water molecule as a by-product.
The phosphate-hydroxyl linkage present between two nucleotides where the phosphate group is attached to the hydroxyl group(OH) at the 5'-carbon of pentose sugar is bonded to the hydroxyl group of the 3'-carbon of the pentose sugar present in the next neighboring nucleotide. This bond is known as a phosphodiester bond.
Thus, option (d) is correct
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a concentrated aqueous solution of sulfuric acid (h2so4) has a density of 1.509 g/ml and contains 10% sulfuric acid by mass. calculate the molality of sulfuric acid.
Molality of sulfuric acid is 1.1.
As we know that density of solution = 1.509 = mass of solution \ Volume.
10% of [tex]H{_2}SO_4[/tex] by mass,
[tex]\frac{10}{100} \times 1.509[/tex] v (g)
As the mass of solvent [tex]=\frac{90}{100}\times 1.509 V(g)[/tex]
98 g of [tex]H{_2}SO_4[/tex] contains moles = 1,
[tex]\frac{10 \times 1.509 V g}{100}[/tex] of [tex]H{_2}SO_4[/tex] contains moles = [tex]\frac{1.509 .v}{10 \times 98}[/tex] moles
Molality = moles of solute/ Mass of solvent (kg)
=[tex]\frac{1.509 \times 100 \times 1000}{10 \times 98 \times 1.509 .V (kg)}[/tex]
= 1.1
Hence, the Molality of sulphuric acid is 1.1.
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calculate the molarity of a solution by dissolving 10.0 g of al(no 3 )3 in enough water to make 250.0 ml of solution.
The molarity of the solution by dissolving the 10.0 g of Al(NO₃)₃ in the enough water to make 250.0 ml of solution is 0.184 M.
The mass of the Al(NO₃)₃ = 10 g
The molar mass of Al(NO₃)₃ = 212.9 g/mol
The number of moles = mass / molar mass
= 10 / 212.9
= 0.046 mol
The volume of the solution = 250 mL = 0.250 L
The molarity expression is :
Molarity = moles / volumes in L
Molarity = 0.046 / 0.250
Molarity = 0.184 M
Thus, the molarity of the Al(NO₃)₃ solution is 0.184 M with the volume of the 250 mL.
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which compound can provide the energy for chemosynthesis?(1 point) responses water water hydrogen sulfide hydrogen sulfide carbon dioxide carbon dioxide oxygen
The compound can provide the energy for chemosynthesis is the carbon dioxide.
The Chemosynthesis is the process in which the certain microbes will create the energy by mediating the chemical reactions. so that the animals that live around the hydrothermal vents will make their living from the chemicals that are coming out of the seafloor. The energy stored in the bundles or the packets is known as the photon. The compound can provide the energy for chemosynthesis is the carbon dioxide and the photons.
Thus, The compound carbon dioxide can provide the energy for chemosynthesis. Therefore the correct , option C is correct.
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what volume of 6 m acetic acid is required to fully react with 0.5 g of sodium bicarbonate (nahco3)?
The volume of 6 M acetic acid required to fully react with 0.5 g of sodium bicarbonate is 0.099167 mL.
To determine the volume of 6 M acetic acid required to fully react with 0.5 g of sodium bicarbonate (NaHCO3), we need to use the balanced equation for the reaction between acetic acid and sodium bicarbonate.
The balanced equation is:
CH3COOH(aq) + NaHCO3(aq) → CH3COONa(aq) + H2O(l) + CO2(g)
From the balanced equation, we know that one mole of acetic acid reacts with one mole of sodium bicarbonate.
we know that the molarity is moles of solute per liters of solvent, so the number of moles in 0.5 g of sodium bicarbonate is 0.5/84 = 0.00595 mol
And since one mole of acetic acid reacts with one mole of sodium bicarbonate, we know that we need 0.00595 mole of acetic acid to fully react with 0.5 g of sodium bicarbonate.
If we know the molarity of acetic acid, we can calculate the volume of acetic acid required to react with 0.5 g of sodium bicarbonate. we have
V = n / M = 0.00595 / 6 = 0.00099167 L = 0.099167 mL
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a solution of formic acid (hcooh) has a ph of 2.29. how many grams of formic acid are there in 100.0 ml of solution?
There are 593.4 grams of formic acid in 100.0 mL of a solution of formic acid (HCOOH) that has a pH of 2.29.
To calculate the grams of formic acid in 100.0 mL of solution, three procedures are performed:
Calculation of the molar concentration of the formic acid solutionCalculation of the number of moles in the 100 ml of formic acid solutionConversion from moles to gramsCalculation of the molar concentration of the formic acid solutionTo calculate the concentration of a solution as a function of pH, the following formula is used:
pH = - log [H3O+]
where [H3O+] is eliminated
2.29 = - log [H3O+]
log[H3O+] = -2.29
10-2.29 = [H3O+]
[H3O+] = 129M
Calculation of the number of moles in the 100 ml of formic acid solutionThen the number of moles in 100 ml of solution is calculated.
If in 1000 ml of solution there are 129 moles of formic acid
So in 100 ml of solution there are x moles of formic acid
X mole of formic acid = 100 ml x 129 moles / 1000 ml
X moles of formic acid = 12.9
Conversion from moles to gramsThen with the molecular weight of formic acid (46 g/mol) the grams of this compound in 100 ml of solution are calculated.
If in 1 mole of formic acid there are 46 grams of compound
So in 12.9 moles there are x grams of compound
X g of formic acid = 12.9 mol x 46 g / 1 mol
X g of formic acid = 593.4
Therefore, in 100.0 mL of solution there are 593.4 g of formic acid.
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Three magnesium isotopes have atomic masses and relative abundances of 23.995 amu (78.99%), 24.986 amu (10.00%), and 25.992 (11.01%). Calculate the average atomic mass of magnesium.
i’ll give brainliest
Answer:
24.3139697
Explanation:
23.995(0.7899)+24.986(0.1000)+25.992(0.1101) = 24.3139697
hich of the following options correctly describe entropy? select all that apply. multiple select question. the symbol for entropy is e. entropy is a measure of the energy dispersal of a system. the greater the freedom of motion of particles in a system, the greater the entropy of the system. any process that causes an increase in the entropy of a system will be spontaneous. entropy is another term for kinetic energy or energy of movement.
The options which correctly describe entropy are- Entropy is a measure of the energy dispersal of a system, The greater the freedom of motion of particles in a system, the greater the entropy of the system and Any process that causes an increase in the entropy of a system will be spontaneous.
What is the definition of entropy?Entropy is a measure of the disorder or randomness of a system, and it is often associated with the amount of energy that is unavailable to do work. The symbol for entropy is S. It is not another term for kinetic energy or energy of movement.
What is the second law of thermodynamics?The second law of thermodynamics says that the total entropy of a system either increases or will remain constant in any spontaneous process. It never decreases.
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