Thermochemistry
In order to break strong bond, the reaction is ___
neither
endothermic
both
exothermic
In which case would you expect the highest amount of energy release upon formation of a chemical bond?
Two atoms from Group 14 sharing electrons equally.
A cation from Group 2 bonding with an anion from Group 17.
A cation from Group 13 bonding with an anion from Group16.
An atom from Group18 acquiring one more electron through ionization.
For a certain process that absorbs energy from its surroundings, what condition must be met for it to be spontaneous at high temperatures?
Its activation energy must be lower than that of competing processes even if it's endothermic at those temperatures.
It needs catalysts present that reduce overall activation energy overcoming endothermy with respect to time but not spontaneity per se.
It should have zero change in volume so pressure does not affect spontaneity despite being endothermic.
The process must have a sufficiently large increase in entropy that compensates for its endothermy at elevated temperatures.
What type of process is boiling water?
Endothermic
Adiabatic
Exothermic
Isothermal
In a calorimeter, if the temperature of the water decreases when a reaction occurs, what type of reaction is it?
Adiabatic
Exothermic
Endothermic
Isothermal
Which statement best describes how a catalyst affects an exothermic reaction at equilibrium when added to the system?
It raises both forward and reverse activation energies, slowing down all reactions equally.
It increases the rate at which equilibrium is reached without altering product or reactant concentrations at equilibrium.
It decreases both forward and reverse reaction rates but does not affect activation energies or concentrations at equilibrium.
It shifts the equilibrium towards more products being formed due to increased reaction rates.
In which situation would you predict that bond formation energy overcomes bond breaking?
When a substance condenses from gas phase into liquid phase.
When solid sublimates directly into gaseous state without passing through liquid phase first.
Where there's need for external application of heat such as boiling water turning into steam.
During chemical reactions where reactants have high initial temperature but produce lower energy products.

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Example of ice pack (where you felt cooler in temperature) means
The heat is transferring from you to the ice pack, meaning endothermic
The heat is transferring from the ice pack to you, meaning exothermic.
The heat is transferring from the ice pack to you, meaning exothermic
The heat is transferring from the ice pack to you, meaning endothermic
Which of the following electronic configurations would most likely result in an element having a high propensity for forming an ionic bond with chlorine?
[Ar]3d^104s^24p^6
[Kr]5s^1
[Ne]3s^23p^4
[He]2s^22p^5
In a reaction progression vs energy chart, if the end point is higher than the start point, then this reaction is
involves basic compounds
exothermic
Negative enthalpy
endothermic