Which of the following is an exothermic reaction?
HGC 1201 ▬ GENERAL CHEMISTRY 2 ▬ Q3 - QUIZ3

Quiz
•
Chemistry
•
11th Grade
•
Medium
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9 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Sublimation of Naphthalene (C10H8)
Melting of Iron (F)
Vaporization of Methanol (CH3OHM
Combustion of Acetylene (C2H2)
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following is defined as the "heat change that takes place when 1 mole of a compound is formed from its elements in their stable states at standard temperature and pressure"?
standard enthalpy of formation
standard enthalpy of hydration
standard enthalpy of atomization
standard enthalpy of combustion
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The standard temperature and pressure is given at which of the following values?
25 degrees Celsius, 760 atm
25 degrees Celsius, 2 atm
25 degrees Celsius, 1 atm
1 degree Celsius, 25 atm
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The change in enthalpy of reaction can be defined as ____.
ΔHproducts +ΔHreactants
ΔHproducts x ΔHreactants
ΔHreactants + ΔHproducts
ΔHproducts - ΔHreactants
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which of the following thermochemical equation is an example that exhibits combustion?
2C3H8O + 9O2 → 6CO2 + 8H2O
C3H8O + H2O → CO2 + O2
C3H8O + NO2 → CO2 + N2O
C3H8O + CO2 → 2CO2 + H2O
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A thermochemical equation shows that the resulting change in enthalpy is ΔH=-78kJ. What can we conclude from the value of the change in enthalpy?
the reaction is endothermic
the products are solid metallic oxides
the reactants are volatile
the reaction is exothermic
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Combustion of hydrocarbons are extremely exothermic reactions. which of the following is a by-product of combustion of hydrocarbons
aqueous carboxylic acids
metallic oxides and water
carbon dioxide and water
aromatic phenols
8.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
This physical law states that: regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
Law of conservation of energy
First law of thermodynamics
Hess's law
Calvin cycle
9.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Consider the following reactions below:
S(s) + 1/2 O2(g) → SO(g) ΔH° = -140.0 kJ
SO2(g) → SO(g) + 1/2 O2(g) ΔH° = 295.5 kJ
Calculate ΔH° for the reaction: S(s) + O2(g) → SO2(g)
435.5 kJ
155.5 kJ
-435.5 kJ
-155.5 kJ
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