What is Lettuce Enthalpy ?

What is Lettuce Enthalpy ?
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Answer :

Lettuce enthalpy is the combination of a gaseous atom's transformation enthalpy method with the basic component of an atom under certain conditions.
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Related questions

What is Enthalpy Change ?

Description : What is Enthalpy Change ?

Last Answer : : The matte energy that is obtained by combining the product of pressure and volume with the internal energy of a system is called enthalpy. Enthalpy is expressed by H. Therefore - enthalpy = ... of a system can be accurately determined. Change of enthalpy = [product enthalpy - reactive enthalpy]

What is quenching heat or quenching enthalpy ?:?

Description : What is quenching heat or quenching enthalpy ?:?

Last Answer : amount of heat generated during the formation of 1 mol of water by diluting 1 mol H + of a given acid at a temperature of 25 ° C is called quenching heat or quenching enthalpy . The value of the propagation heat of all strong acids and strong bases is equal to - 57.34 kj .

What is combustion heat or combustion enthalpy ?

Description : What is combustion heat or combustion enthalpy ?

Last Answer : The change in enthalpy that occurs when a basic or compound substance is completely burned in oxygen at a certain temperature and 1 atm pressure is called combustion heat or combustion enthalpy. The change ... combustion heat or proof combustion enthalpy of that substance. It is expressed by H ° C.

What is the composition of the compound called heat or structure enthalpy ?

Description : What is the composition of the compound called heat or structure enthalpy ?

Last Answer : The change in enthalpy that occurs during the production of one mole from the constituent elements of a compound in the state of proof is called the formation of heat or formation enthalpy of the compound. The enthalpy ... a temperature of 25 ° C and a pressure of 1 atm is expressed by ∆ H ° f .

The order of Ionization enthalpy between following atoms is?

Description : The order of Ionization enthalpy between following atoms is?

Last Answer : B, Tl, Ga, Al and In. Ans.B>Tl>Ga> Al> In.

How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Description : How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Last Answer : Ans The hydration enthalpies of alkaline earth metal ions decrease with increase in ionic size down the group. Be2+> Mg2+ > Ca2+ > Sr2+ > Ba2+ The hydration enthalpies of alkaline earth metal ions ... MgCl2 and CaCl2 exist as MgCl2.6H2O and CaCl2· 6H2O while NaCl and KCl do not form such hydrates.

How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Description : How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Last Answer : Ans The alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms. Since the atomic size increases down the group, their ionization enthalpy decreases The first ... enthalpies of the alkaline earth metals are smaller than those of the corresponding alkali metals.

Which alkali metal will have highest hydration enthalpy ?

Description : Which alkali metal will have highest hydration enthalpy ?

Last Answer : Ans. Li

Assign the reason for the following: (a) Enthalpy of fusion of water is higher as compared to the hydrides of Sulphur & Selenium. (b) Water is quite stable and does not dissociate in to its elements even at high temperature.

Description : Assign the reason for the following: (a) Enthalpy of fusion of water is higher as compared to the hydrides of Sulphur & Selenium. (b) Water is quite stable and does not dissociate in to its elements even at high temperature.

Last Answer : Ans-a) Due hydrogen bond it has high latent heat of fusion b) Water is a stable compound and its decomposition is not thermodynamically feasible

What is the sign of enthalpy of formation of highly stable compound?

Description : What is the sign of enthalpy of formation of highly stable compound?

Last Answer : Ans. Negative.

Out of carbon(diamond)and carbon (graphite) whose enthalpy of formation is taken as zero?

Description : Out of carbon(diamond)and carbon (graphite) whose enthalpy of formation is taken as zero?

Last Answer : Ans. Enthalpy of formation of carbon in the form of graphite is taken as zero because it is a more commonly found in stable form of carbon.

Write an expression in the form of chemical equation for the standard enthalpy of formation (∆Hf) of CO (g).

Description : Write an expression in the form of chemical equation for the standard enthalpy of formation (∆Hf) of CO (g).

Last Answer : Ans. C(s) +1/2 O2(g) → CO (g)

What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

Description : What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

Last Answer : Ans.The free energy change of a reaction is given by ΔG = ΔH - TΔS For a reaction to be spontaneous, ΔG should be -ve. If both ΔH and ΔS are positive ΔG can be -ve if TΔS>ΔH in magnitude. Thus, entropy ... is low, TΔS should be greater than ΔH (ii) If ΔS is small, T should be so large that TΔS>ΔH.

Give enthalpy (H) of all elements in their standard state.

Description : Give enthalpy (H) of all elements in their standard state.

Last Answer : Ans. In standard state enthalpies of all elements is zero.

Classify the following properties as extensive and intensive properties: Molar heat capacity, temperature, enthalpy and volume.

Description : Classify the following properties as extensive and intensive properties: Molar heat capacity, temperature, enthalpy and volume.

Last Answer : Ans. Extensive properties : Enthalpy and volume. Intensive properties: Molar heat capacity, temperature.

(i)What happens to the internal energy of the system. (a) if work is done by the system. (b)Work is done on the system. (ii) Why enthalpy of neutralization of strong acid and base is consant?

Description : (i)What happens to the internal energy of the system. (a) if work is done by the system. (b)Work is done on the system. (ii) Why enthalpy of neutralization of strong acid and base is consant?

Last Answer : Ans. (i).(a)ΔU Decreases. (ΔU = q - w) (b)ΔU increases. (ΔU = q + w) (ii) Strong acids and bases dissociate completely into ions in aqueous solution and form 1 mole of water.

(i)State why heat changes in physical and chemical processes are indicated by enthalpy changes and not by entropy changes? (ii)What are the limitations of First Law of thermodynamics?

Description : (i)State why heat changes in physical and chemical processes are indicated by enthalpy changes and not by entropy changes? (ii)What are the limitations of First Law of thermodynamics?

Last Answer : (i) Most of the processes are carried out in an open system i.e, at constant pressure. (ii)(a) Can’t explain the feasibility of the reaction. (b)It poses no restriction on the direction of flow of heat. (c)Practically it is not possible to convert the heat energy into an equivalent amount of work.

What is bond enthalpy ? What is its unit ? How we calculate enthalpy in case of complex compound ?

Description : What is bond enthalpy ? What is its unit ? How we calculate enthalpy in case of complex compound ?

Last Answer : Ans. Amount of energy Required ot break one mole of bonds of particular type b/w two atoms in gaseous state. Its unit is KJ/mole It is obtained by dividing total bond dissociation enthalpy by no. of bonds broken

Define Bond length& Bond dissociation enthalpy

Description : Define Bond length& Bond dissociation enthalpy

Last Answer : Ans. The equilibrium distance between the centre s of the nuclei of two bonded atoms is called bond length. The energy required to break a bond is called bond dissociation enthalpy.

From each set, choose the element with largest ionization enthalpy and explain your answer. (a) F, O, N (b) Mg, P, Ar (c) B, Al, Ga

Description : From each set, choose the element with largest ionization enthalpy and explain your answer. (a) F, O, N (b) Mg, P, Ar (c) B, Al, Ga

Last Answer : Ans. (a). The element fluorine F has the largest ionization enthalpy because in general, it increases along the period. These elements belong to the second period in the order is: N, O, F. Therefore, ... the order of B, Al, Ga. Therefore, the first element B is expected to have the largest value.

From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. (c) The element with smallest ionic radius. (d) The element with six electrons in the valence shell. (e) The element which is a liquid at room temperature. (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.

Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.

Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.

Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)

Description : Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)

Last Answer : Ans. (a). I

Explain why Electron gain enthalpy of noble gases is positive.

Description : Explain why Electron gain enthalpy of noble gases is positive.

Last Answer : Ans. Noble gases have large positive electron gain enthalpies because the extra electron has to be placed in the next higher principal quantum energy level, thereby producing highly unstable electronic configuration.

Explain why Halogens have very high negative electron gain enthalpy?

Description : Explain why Halogens have very high negative electron gain enthalpy?

Last Answer : Ans.The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron.

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Description : Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Last Answer : Ans. Second electron affinity of O is largely +ve because of repulsion between negatively charged ions and second electron to be added. Energy required to overcome repulsion is more than the energy released in gaining electron, so net energy is absorbed.

(a). Which is largest in size- Cu+ , Cu+2, Cu and why? (b). which element in the periodic table has the highest ionization enthalpy? (c). Which element is more metallic in the periodic table.?

Description : (a). Which is largest in size- Cu+ , Cu+2, Cu and why? (b). which element in the periodic table has the highest ionization enthalpy? (c). Which element is more metallic in the periodic table.?

Last Answer : Ans. (a). Cu is largest due to less effective nuclear charge. It has 29 electrons, 29 protons, Cu+ has 28 electrons and 29 protons, Cu2+ has 27 electrons and 29 protons. (b). He has highest ionization enthalpy. (c). Mg is more metallic due to lower ionization energy

Among the elements of the 3rd period from Na to Ar, pick out the element: (L-2) (a). with highest first ionization enthalpy. (b). with largest atomic radius. (c). that is most reactive non-metal. (d). that is most reactive metal.

Description : Among the elements of the 3rd period from Na to Ar, pick out the element: (L-2) (a). with highest first ionization enthalpy. (b). with largest atomic radius. (c). that is most reactive non-metal. (d). that is most reactive metal.

Last Answer : (a). Ar has highest first ionization enthalpy. (b). Na has large atomic radius (covalent radius). (c). Cl is more reactive non-metal in 3rd period. (d). Na is most reactive metal in third period.

Which out of F or Cl has a more negative electron gain enthalpy?

Description : Which out of F or Cl has a more negative electron gain enthalpy?

Last Answer : Ans. Cl has more negative electron gain enthalpy. It is because there is more inter electronic repulsion between valence electrons of F, due to smaller size than Cl.

Explain the following , giving reason . (a) Transition metal and many of their compounds show paramagnetic behavior (b) The enthalpy of atomisation of the transition metal is high . (c) The Transition metal generally form coloured compounds .

Description : Explain the following , giving reason . (a) Transition metal and many of their compounds show paramagnetic behavior (b) The enthalpy of atomisation of the transition metal is high . (c) The Transition metal generally form coloured compounds . 

Last Answer : Ans(a) It is due to unpaired electrons . (b) It is due to strong metallic bond and additional Covalent bonds due to presence of unpaired electron in d- orbitals (c) It is due to presence of unpaired electrons ,they undergo d-d transition . 

Why do transition metals have high enthalpy of atomization ?

Description : Why do transition metals have high enthalpy of atomization ?

Last Answer :  Ans : it is due to strong metallic bonds and additional covalent bonds 

Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ?

Description : Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ? 

Last Answer : Ans Due to smallest size and high effective nuclear charge , readily accept one electron  to acquire noble gas electronic configuration  

Defination of Enthalpy of Adsorption

Description : Defination of Enthalpy of Adsorption

Last Answer : Enthalpy of Adsorption:- The amount of energy released by the attraction of one mole of adsorbate on the adsorbent.

Why enthalpy of water in liquid state (25 C) is less than the enthalpy of steam (100 C)?

Description : Why enthalpy of water in liquid state (25 C) is less than the enthalpy of steam (100 C)?

Last Answer : Ans: Enthalpy of water in liquid state is less than steam because the steam is at high temperature i.e;100 C, whereas that of liquid water is 25 C.

How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals

Description : How does the of Hydration Enthalpy of alkaline earth metals vary & compare it with alkali metals  

Last Answer : The hydration enthalpies of alkaline earth metal ions decrease with increase in ionic size down the group. Be2+> Mg2+ > Ca2+ > Sr2+ > Ba2+ The hydration enthalpies of alkaline earth metal ... and CaCl2 exist as MgCl2.6H2O and CaCl2· 6H2O while NaCl and KCl do not form such hydrates.  

How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals

Description : How does the of Ionization Enthalpy of alkaline earth metals vary in comparison to alkali metals 

Last Answer : The alkaline earth metals have low ionization enthalpies due to fairly large size of the atoms. Since the atomic size increases down the group, their ionization enthalpy decreases The first ionisation ... of the alkaline earth metals are smaller than those of the corresponding alkali metals.  

Why the ionization enthalpy decreases down the group ?

Description : Why the ionization enthalpy decreases down the group ? 

Last Answer : This is because, the Increase in atomic size is more predominant over increasing nuclear charge and the outer most electrons are very well screened from the nuclear charge by the inner shell electrons 

Arrange the first group elements in the decreasing order of Hydration Enthalpy

Description : Arrange the first group elements in the decreasing order of Hydration Enthalpy 

Last Answer : The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes. Li+ > Na+ > K+ > Rb+ > Cs+

How the ionization enthalpy varies in alkali metals

Description : How the ionization enthalpy varies in alkali metals 

Last Answer : Ionization enthalpy decrease down the group from Li to Cs. 

Which group elements show very low ionization enthalpy in the periodic table?

Description : Which group elements show very low ionization enthalpy in the periodic table?

Last Answer : First group elements (alkali metals) 

If your room has a natural tendency to become messy and disordered, it is an excellent example of: w) enthalpy x) entropy y) the Bernoulli effect z) the Haase effect

Description : If your room has a natural tendency to become messy and disordered, it is an excellent example of: w) enthalpy x) entropy y) the Bernoulli effect z) the Haase effect

Last Answer : ANSWER: X -- ENTROPY

What American first proposed the free energy function G, which interrelates entropy and enthalpy?

Description : What American first proposed the free energy function G, which interrelates entropy and enthalpy?

Last Answer : ANSWER: J. WILLARD GIBBS 

Which of the following molecules would have the smallest molar enthalpy of vaporization? w) Water x) Formaldehyde y) Methane z) Ammonia

Description : Which of the following molecules would have the smallest molar enthalpy of vaporization? w) Water x) Formaldehyde y) Methane z) Ammonia

Last Answer : ANSWER: Y -- METHANE

In any chemical reaction, a quantity that decrease to a minimum is: w) free energy x) entropy y) temperature z) enthalpy

Description : In any chemical reaction, a quantity that decrease to a minimum is: w) free energy x) entropy y) temperature z) enthalpy

Last Answer : ANSWER: W -- FREE ENERGY

Why aren't items like Romaine lettuce labelled to make it easy to find out the seller immediatlely in case of contamination?

Description : Why aren't items like Romaine lettuce labelled to make it easy to find out the seller immediatlely in case of contamination?

Last Answer : It's really hard to barcode a leaf of lettuce. As was answered 3-4 days ago, distributors buy their romaine from tens or even hundreds of growers in a particular region. The distributor aggregates it, ... put in the position of knowing which head of lettuce it used three weeks ago? I doubt it.

Can I safely give my romaine lettuce to the wildlife around my home?

Description : Can I safely give my romaine lettuce to the wildlife around my home?

Last Answer : Don’t know but I wouldn’t if it were me.

Why do people trust the CDC about romaine lettuce but not about vaccines?

Description : Why do people trust the CDC about romaine lettuce but not about vaccines?

Last Answer : I think it’s easier for people to accept: X is questionable. Don’t put it inside your body. Trust me. Than: X is perfectly fine. Put it inside your body. Trust me. For the record, I’m pro-science and vaccinate.

What's the deal with supermarkets and lettuce companies putting moisture on vegetables?

Description : What's the deal with supermarkets and lettuce companies putting moisture on vegetables?

Last Answer : It makes shoppers think the product is more fresh. Other than that, no benefit.

Does anyone like when a salad has big pieces or a wedge of lettuce?

Description : Does anyone like when a salad has big pieces or a wedge of lettuce?

Last Answer : I love those big pieces of lettuce. So crispy!

When you buy packaged lettuce at the "organic" grocery store, do trust the label when it says "Pre-Washed"?

Description : When you buy packaged lettuce at the "organic" grocery store, do trust the label when it says "Pre-Washed"?

Last Answer : No, I wash it again too. Someone might not be as diligent as cleaning the veggies as I would be.

Is lettuce OK if it is a little brown on the edges.

Description : Is lettuce OK if it is a little brown on the edges.

Last Answer : Absolutely fine to eat, just trim. =)