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Which of the following is endothermic a dry ice evaporating b a sparkler burning c the reaction that occurs in a chemical cold pack often used to ice athletic injuries?
Dry ice evaporating is endothermic-->+DeltaH A sparkler burning is exothermic--->-DeltaH The reaction that occurs in a chemical cold pack often used to ice athletic injuries is endothermic--->+DeltaH
When the actual free energy change of a reaction change in G has a numerical value of less than zero negative number what will happen?
When the delta G is negative the reaction is said to be spontaneous or in other words favorable. It also means the reaction is irreversible once full product concentration is reached. If delta G is positive, the reaction is unfavorable thus can easily be reversed. If it is zero it is at equilibrium.
What does a negative H tell about a reaction?
A negative change in enthalpy (ΔH) indicates that a reaction is exothermic, meaning it releases heat to its surroundings. This suggests that the products have less energy than the reactants, leading to a decrease in enthalpy during the reaction.
Can the extent of a reaction be negative?
Yes, the extent of a reaction can be negative if the reaction does not proceed as expected or if the products formed are not desirable.
What would form a spontaneous reaction at 298 K?
deltaH=28 kJ/mol, deltaS=0.109 kJ(molK)
What is a chemical reaction at equilibrium?
deltaG = deltaH -TdeltaS. deltaG = 0 at equilibrium. Therefore deltaH = TdeltaS
How is the deltaHf related to the deltaH of a reaction?
The enthalpy of formation (deltaHf) is the enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states. The deltaH of a reaction is the difference in enthalpy between the products and the reactants. The deltaH of a reaction can be calculated by taking the sum of the deltaHf of the products minus the sum of the deltaHf of the reactants.
What does a negative H tell you about a reaction?
yes
Is baking soda and citric acid a endothermic or exothermic reaction?
It is endothermic. The heat of the water in the calorimeter decreases (giving you a -deltaH), which means that the system absorbed heat, making the reaction endothermic.
Which of the following is endothermic a dry ice evaporating b a sparkler burning c the reaction that occurs in a chemical cold pack often used to ice athletic injuries?
Dry ice evaporating is endothermic-->+DeltaH A sparkler burning is exothermic--->-DeltaH The reaction that occurs in a chemical cold pack often used to ice athletic injuries is endothermic--->+DeltaH
When the actual free energy change of a reaction change in G has a numerical value of less than zero negative number what will happen?
When the delta G is negative the reaction is said to be spontaneous or in other words favorable. It also means the reaction is irreversible once full product concentration is reached. If delta G is positive, the reaction is unfavorable thus can easily be reversed. If it is zero it is at equilibrium.
What does a negative H tell about a reaction?
A negative change in enthalpy (ΔH) indicates that a reaction is exothermic, meaning it releases heat to its surroundings. This suggests that the products have less energy than the reactants, leading to a decrease in enthalpy during the reaction.
Can you reverse an iron nail rusting?
NO!!!! There is a phycial chemical equation named the 'Gibbs Free Energy Change'. If the calculations result in a negative answer then the reaction is feasible, but the reverse (positive answer) is NOT feasible. DeltaG = DeltaH - T*DeltaS is the basic equation. DeltaH is the enthalpy change (kJmol^(-1) DeltaS is the entropy change (J mol^(-1)(K^(-1)) Careful with these units and their conversion. T is the temperature in (Kelvin(K)). So without putting in any numbers, for the rusting of iron 'DeltaG is negative(-). However, to try and make the reaction go the otherway , then DeltaG is positive(+), and so is NOT feasible.
Can the extent of a reaction be negative?
Yes, the extent of a reaction can be negative if the reaction does not proceed as expected or if the products formed are not desirable.
What important information does thermochemical equation have that a regular balanced equations does not?
A thermochemical equation shows the amount of heat given out or taken in when the reaction occurs. CH4 + 2O2 = CO2 +2H2O, deltaH = -890 kJ/mol Note delta H is negative when heat is given out, exothermic and +ve when endothermic. Sorry can't do delta symbol - its a triangle!
What would form a spontaneous reaction at 298 K?
deltaH=28 kJ/mol, deltaS=0.109 kJ(molK)
What does it indicate when the value of G is negative in a chemical reaction?
When the value of G is negative in a chemical reaction, it indicates that the reaction is spontaneous and releases energy.
