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