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WorksheetsEnergy in Bonding
Total questions: 14
Worksheet time: 5mins
Does breaking bonds require energy, release energy, or not involve energy at all?
requires energy to break
releases energy when broken
No energy involved
What kind of energy change happens in the photosynthesis reaction in plant leaves?
Endo
Exo
No change
Burning leaves and burning a fuel provide a(n) _______ change.
endothermic
exothermic
physical
When new chemical bonds form, energy ____________.
is taken into the system.
is released from the system.
stays the same in the system.
A stable bond is ___________ bond.
higher energy
lower energy
Lower-energy bonds have __________ attractive force between two atoms or ions.
stronger
weaker
no
A high energy bond __________ break.
is more likely to break.
less likely to break.
will never break.
Bonding is the holding of two particles together by a significant ________ force
repulsive
attractive
neutral
Potential energy in bonding is made by _______________ forces.
electrostatic
gravitational
contact
How can we figure out if an overall reaction is endo- or exo-thermic? It is the difference between _______ and __________.
hot and cold temperatures
energy to break and energy to form bonds.
time to form a bond versus time to break a bond
In a reaction old bonds _______ and new bonds _______.
form , break
break, form
stay, added
Is this equation endo- or exo-thermic?
PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy
endothermic
exothermic
Is this equation endo- or exo-thermic?
2KNO3 (s) + energy --> 2KNO2 (s) + O2
endothermic
exothermic
Is this reaction endo- or exo-thermic?
NH4NO2 + energy --> N2 (g) + 2H2O (g)
endothermic
exothermic
