
Honors Unit 12 Review
Authored by Christopher Paullus
Chemistry
9th - 12th Grade
Used 12+ times

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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
When new chemical bonds form, energy ____________.
is taken into the system.
is released from the system.
stays the same in the system.
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
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
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Based upon the graph above, what type of reaction is this?
Endothermic
Exothermic
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which of the following represents an exothermic reaction?
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
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 = -1204 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
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
For the reaction 2H2(g) + O2(g) → 2H2O(g) the bond enthalpies (in kJ/mol) are
H-H = x, O=O = y, O-H = z
Which 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
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which is an example of an endothermic physical reaction?
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