Worksheets11C Energy Changes in Chemical Reactions
Total questions: 10
Worksheet time: 6mins
What is the general term used to describe the energy change that occurs in a chemical reaction?
enthalpy
exothermic
endothermic
activation energy
Define exothermic reaction.
A chemical reaction that occurs at extremely high temperatures.
A chemical reaction that releases energy in the form of heat or light.
A chemical reaction that does not release any energy.
A chemical reaction that absorbs energy in the form of heat or light.
Define endothermic reaction.
An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.
An endothermic reaction is a chemical reaction that does not involve any heat exchange.
An endothermic reaction is a chemical reaction that occurs at extremely high temperatures.
An endothermic reaction is a chemical reaction that releases heat into its surroundings.
In an exothermic reaction, is the energy released or absorbed?
absorbed
released
neutralized
converted
In an endothermic reaction, is the energy released or absorbed?
consumed
neutral
absorbed
released
What is the symbol used to represent the heat energy change in a chemical equation?
ΔG
ΔH
ΔE
ΔS
How is the energy change calculated in a chemical reaction?
By taking the difference between the energy of the products and the energy of the reactants.
By dividing the energy of the products by the energy of the reactants.
By multiplying the energy of the products and the energy of the reactants.
By adding the energy of the products and the energy of the reactants.
What is the sign of the energy change for an exothermic reaction?
Positive (+)
Zero (0)
Undefined
Negative (-)
What is the sign of the energy change for an endothermic reaction?
+
++
0
-
Classify the following reaction as exothermic or endothermic: 2H2(g) + O2(g) → 2H2O(g)
endothermic
catalytic
spontaneous
exothermic
