Thermochemistry
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.
What type of process is boiling water?
Endothermic
Adiabatic
Exothermic
Isothermal
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
In an exothermic reaction where heat is released into the surroundings, how does this affect the potential energy of the products compared to the reactants?
The products have higher potential energy than the reactants.
The products have lower potential energy than the reactants.
Potential energy remains constant throughout the reaction.
The products have equal potential energy as the reactants.
In an endothermic multi-step reaction, which statement best describes how a catalyst affects the rate-determining step?
It raises the activation energy needed for subsequent steps to occur faster than this one.
It lowers the activation energy for that specific step.
It increases the temperature at which that specific step occurs.
It provides an alternative pathway with lower overall enthalpy change.
Given that both endothermic and exothermic reactions can be spontaneous depending on conditions, which research question accurately explores a variable that determines spontaneity at a given temperature?
What role does catalyst presence play in altering heat flow during a chemical reaction?
How does changing entropy influence Gibbs free energy (ΔG) and thus affect reaction spontaneity at constant temperature and pressure?
In what way does altering bond strengths between molecules impact overall reaction kinetics at varied temperatures?
Does modifying reactant concentrations shift reaction equilibria towards more energetic or less energetic products?
Newton's cradle (in an frictionless space) demonstrated the principle of
conservation of mass
conservation of energy
ideal gas law
second law of thermodynamics

How are we doing?
Give us your feedback and let us know how we can improve
A chemical reaction that releases heat to the surrounding is ____ and have a ____ ΔH value
endothermic, positive
exothermic, positive
exothermic, negative
endothermic, negative
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 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