Worksheets4E Energy Change
Total questions: 15
Worksheet time: 14mins
Which of the following process is exothermic?
Candle wax melting
A puddle evaporating
Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide
Water freezing to form ice
What type of reaction in this?
Exothermic
Endothermic
The complete combustion of methane is an exothermic reaction.
Which statement explains this?
More bonds are broken than are formed.
More bonds are formed than are broken.
Total enthalpy of the bonds broken is greater than total enthalpy of the bonds formed.
Total enthalpy of the bonds broken is less than the total enthalpy of the bonds formed.
When 1g of ethane (C2H6) burnt, 52kJ of energy is released.
How much heat is released when 2 moles of ethane burns?
3.4kJ
104kJ
2912kJ
3120kJ
The enthalpy change for the following reaction is -184 kJ:
H2 + Cl2 --> 2HCl
The H-H bond energy is 436 kJ/mol and the H-Cl bond energy is 431 kJ/mol.
What is the Cl-Cl bond energy?
121 kJ/mol
242 kJ/mol
340 kJ/mol
680 kJ/mol
