What is the primary purpose of using bond enthalpies in chemical reactions?

Bond Enthalpy Concepts and Calculations

Interactive Video
•
Chemistry, Science, Physics
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To determine the color of the reactants
To identify the state of the products
To measure the speed of the reaction
To calculate the enthalpy changes
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to energy when chemical bonds are broken?
Energy is converted to mass
Energy is released
Energy is absorbed
Energy remains constant
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are average bond enthalpies considered 'average'?
They are averaged over different molecules
They are based on theoretical values
They are calculated at room temperature
They are measured in different states
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which bond enthalpy is used for a double bond in calculations?
Twice the single bond enthalpy
The enthalpy of a single bond
The enthalpy of the entire double bond
Half the single bond enthalpy
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the enthalpy change of the reaction between hydrogen and oxygen to form water?
-370 kJ/mol
0 kJ/mol
482 kJ/mol
-482 kJ/mol
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of the negative sign in the enthalpy change of a reaction?
The reaction is exothermic
The reaction is endothermic
The reaction is non-spontaneous
The reaction is at equilibrium
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is water shown as a gas in the enthalpy change calculation?
Because it is easier to measure as a gas
Because bond enthalpies are determined for gaseous states
Because it reacts faster as a gas
Because it is more stable as a gas
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