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First of all, entropy is the defined as the extent to which something is disordered. In chemistry, for entropy in a SYSTEM to decrease, the products of a reaction must be less disordered than the reactants. The extent of "disordered-ness" can be seen by the physical states of the substances. A gas is more disordered than a liquid, which is more disordered than a solid. So, an example of a reaction that leads to a decrease in entropy is:
HCl(gas) +NH3(gas) -----> NH4Cl(solid)
So you see, there are more gaseous molecules in the reactant side of the equation than in the product side, which means the products are less disordered than the reactants.
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However, one must note that if the entropy of a system(reaction) decreases, the entropy of the surroundings should increase. This is because
change in TOTAL entropy(A) = change in entropy of SYSTEM(B) + change in entropy of SURROUNDINGS(C).
It is a rule that A must increase in every case ( have a positive value). If the B is negative(a decrease in entropy), C must be positive(an increase in entropy) to keep the value of A positive.
Entropy can decrease in a system if energy is removed or transferred elsewhere, causing a decrease in randomness or disorder within the system. This could occur, for example, if the system undergoes a phase transition where the molecules become more ordered or structured.
Entropy of a system can decrease if entropy of the environment increases. One example is heat rejection.
CO2(g)-->CO2(l)
water freezing
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What does delta S 0 mean in a reaction?
The system becomes more random.
Under what conditions will a low temperature make a reaction spontaneous?
if H and S are both negative
What is the value equal to the enthalpy minus temperature times entropy?
The value you are referring to is the Gibbs free energy, which is equal to the enthalpy minus the temperature multiplied by the entropy: ĪG = ĪH - TĪS. This equation is used to determine if a reaction is spontaneous under certain conditions.
What is the free energy for ammonium oxalate?
The free energy for a compound like ammonium oxalate would depend on the specific conditions of the system, such as temperature and pressure. The free energy can be calculated using the Gibbs free energy equation, which takes into account the enthalpy and entropy changes of the reaction. You would need specific experimental data or calculations to determine the free energy for ammonium oxalate under particular conditions.
When can HFC-134a become combustible in a mobile air condition system?
HFC-134a is not combustible under typical operating conditions in a mobile air conditioning system. However, it can become combustible when exposed to high temperatures (above 1300Ā°F) and an open flame or spark, which can cause it to break down into toxic byproducts and potentially ignite.
What does delta S 0 mean in a reaction?
The system becomes more random.
Under what conditions will a low temperature make a reaction spontaneous?
if H and S are both negative
Under normal condition the thromostat of heating and cooling system require?
A wall.
What is entrophy?
Entropy is:It is denoted by S.It is a state function and ΔS is independent of path.Entropy is a measure of the degree of randomness or disorder in a system.Greater the disorder of a system, the higher is the entropy. The decrease of regularity in structure means increase in entropy.Crystalline solid is the state of lowest entropy (most ordered) and the gaseous state is a state of highest entropy.As the temperature increases, randomness increases, and thus, entropy increases.For a reversible reaction, entropy change (ΔS)(for a reversible reaction)At equilibrium, ΔS = 0Entropy of a spontaneous reaction increases till it reaches the maximum, and at equilibrium, ΔS = 0Entropy is a state property. Therefore, entropy change for a reversible process is given byFor reversible and irreversible isothermal expansion of an ideal gas (that is under isothermal conditions), ΔU = 0. But is not zero for the irreversible process.Main definition are stated according to http://wiki.answers.com/Q/FAQ/8454.Thermodynamics is the study of energy conversion between heat and mechanical work which leads to the macroscopic properties such as temperature, volume, and...
How do you prove benford's law?
Benford's law is obtained as maximum entropy distribution of balls in boxes under the assumption that the number of balls in a box can be 1,2,3....9. For derivation see Oded Kafri "entropy principle in direct derivation of Benford's law" at arxive (2009) .
Is isothermal expansion reversible under ideal conditions?
Yes, isothermal expansion is considered reversible under ideal conditions because it occurs at a constant temperature, resulting in no change in entropy. This means that the process can be reversed with the same work input, making it reversible.
What are the entropy and enthalpy?
Enthalpy is the energy of the molecules. It cannot be measured, although CHANGE in enthalpy of reactions can be measured. It's simply heat energy. Exothermic reactions have anegative enthalpy change(which means energy of the products is lower than that of the reactants). Endothermic reactions have a positive value(energy of products is higher than that of the reactants). Entropy, on the other hand, is the degree of disorder. It's the measurement of how disordered a substance is. For example, particles in a solid are regularly arranged, so they are less disordered, and have a low value of entropy. Gases have much higher entropies. Entropy of an individual compound can be measured/calculated.
What is proper to decrease systolic while diastolic is under control?
50
Is volume is a measure of how much the particles of a substance decrease under pressure?
FALSE
Why does the Toyota Celica overheat when you use the air conditioning?
Under normal conditions a modern vehicle should not overheat when the air conditioning system is on. The first steps to investigating this condition are ensuring correct coolant level, condition, flow and thermostat actuation.
What is the decision making under certainty condition?
decition making under certainty
What are the organs under the shoot system of plant?
under the shoot system is the root system which consists the root
