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