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Bond Energy
Quiz 1
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Q.1
When the solids Ba(OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops. Which statement about the energetics of this reaction is correct?
The reaction is endothermic and ΔH is negative
The reaction is endothermic and ΔH is positive
The reaction is exothermic and ΔH is negative
The reaction is exothermic and ΔH is positive
Q.2
The following equation shows the formation of magnesium oxide from magnesium metal. Which statement is correct for this reaction?2Mg(s) + O2(g) → 2MgO(s) ΔH = -kJ
1204 kJ of energy are released for every mole of magnesium reacted
602 kJ of energy are absorbed for every mole of magnesium oxide formed
602 kJ of energy are released for every mole of oxygen reacted
1204 kJ of energy are released for every two moles of magnesium oxide formed
Q.3
Which is an example of an endothermic physical reaction?
a) Ice melting
b) Combustion
c) Steam condensing
d) Photosynthesis
Q.4
Which statement is true regarding endothermic reactions?
Temperature change is positive and enthalpy change is positive
Temperature change is positive and enthalpy change is negative
Temperature change is negative and enthalpy change is positive
Temperature change is negative and enthalpy change is negative
Q.5
The average bond enthalpies for O-O and O=O areandkJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below?H-O-O-H(g) → H-O-H(g) + ½O=O(g)
-102
+102
+350
+394
Q.6
Which statements about exothermic reactions are correct?I. They have negative ΔH values II. The products have a lower enthalpy than the reactants III. The products are more energetically stable than the reactants
I and II only
I and III only
II and III only
I, II, and III
Q.7
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
Q.8
Is this equation endo- or exo-thermic?2KNO3 (s) + energy --> 2KNO2 (s) + O2
endothermic
exothermic
Q.9
Is this equation endo- or exo-thermic?PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy
endothermic
exothermic
Q.10
What kind of energy change happens in the photosynthesis reaction in plant leaves?
Endothermic
Exothermic
No change
Q.11
Does breaking bonds require energy, release energy, or not involve energy at all?
requires energy to break
releases energy when broken
No energy involved
Q.12
For the reaction 2H2(g) + O2(g) → 2H2O(g) the bond enthalpies (in kJ/mol) are H-H = x, O=O = y, O-H = zWhich calculation will give the value, in kJ/mol, of ΔH for the reaction?
2x + y - 2z
4z - 2x - y
2x + y - 4z
2z - 2x - y
Q.13
True or false: when bonds are broken the energy is positive because energy goes into the system
True
False
Q.14
Kuppler went to college to become a teacher. What college did Kuppler attend?
Rowan University
University of Pennsylvania
The College of NJ (TCNJ)
Stockton College
Q.15
Kuppler has a dog. His dog's name is:
Piper
Chloe
Rex
Fido
Q.16
This is the number of years that Kuppler has been teaching at Kingsway:
3 years
5 years
9 years
10 years
15 years
Q.17
If you hold a container where a chemical reaction is taking place and it feels warm to you, this reaction is:
endothermic
exothermic
isothermic
what?
Q.18
What is an electron?
+ charged particle in an atom's nucleus
- charged particle in an atom's nucleus
- charged particle outside an atom's nucleus
+ charged particle outside an atom's nucleus
Q.19
Which units are used to measure energy?
Newtons
kilograms
meters/second
Joules
Q.20
All types of chemical bonds hold the same amount of chemical energy.
True
False
0 h : 0 m : 1 s
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