Which statement is true for the reaction: O + O --> O 2

A bond is formed and energy is released

A bond is broken and energy is released

A bond is broken and energy is absorbed

A bond is formed and energy is absorbed

What occurs when the reaction takes place? 2HCl --> H 2 + Cl 2

H-Cl bonds are breaking and H-H bonds are forming

H-Cl bonds are forming and H-H bonds are breaking.

H-Cl bonds are forming and Cl-Cl bonds are forming.

H-H bonds are breaking and H-Cl are forming

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? (make a sketch to see where heat goes)

The temperature did not change.

Energy is released from the reaction into the surrounding.

During a particular chemical reaction it takes 100 Kj of energy to break all the bonds and 150 Kj of energy is released when the new bonds form. Which is true about the overall reaction?

It is exothermic and releases 50 Kj

It is endothermic and absorbs energy.

It is exothermic and releases 150 Kj

It is endothermic and releases energy.

Review on enthalpy of reaction/bond energy

Authored by Vasiliky Kyrimis

Chemistry

10th Grade

NGSS covered

Used 3+ times

Review on enthalpy of reaction/bond energy

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this equation endo- or exo-thermic?
2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

endothermic

exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this reaction endo- or exo-thermic?
NH₄NO₂ + energy --> N₂ (g) + 2H₂O (g)

endothermic

exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Is this equation endo- or exo-thermic?
PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

endothermic

exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Based upon the graph above, what type of reaction is this?

Endothermic

Exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Based upon the graph above, what type of reaction is this?

Endothermic

Exothermic

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the graph above, what does D represent?

activation energy

products

reactants

enthalpy change

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following represents an exothermic reaction?

Tags

NGSS.HS-PS1-4

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Review on enthalpy of reaction/bond energy

Is this equation endo- or exo-thermic?
2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

Is this reaction endo- or exo-thermic?
NH₄NO₂ + energy --> N₂ (g) + 2H₂O (g)

Is this equation endo- or exo-thermic?
PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

Based upon the graph above, what type of reaction is this?

Based upon the graph above, what type of reaction is this?

In the graph above, what does D represent?

Which of the following represents an exothermic reaction?

Which of the following represents an exothermic reaction?

The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below? (Hint: coefficient plays a role)
H₂O₂(g) → H₂O(g) + ½O₂(g)

Approximate values of the average bond enthalpies, in kJ/mol, of three substances are:
H-H = 430, F-F = 155, H-F = 565
What is the enthalpy change in kJ for this reaction: 2HF → H₂ + F₂

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Review on enthalpy of reaction/bond energy

Is this equation endo- or exo-thermic?2KNO3 (s) + energy --> 2KNO2 (s) + O2

Is this reaction endo- or exo-thermic?NH4NO2 + energy --> N2 (g) + 2H2O (g)

Is this equation endo- or exo-thermic?PCl3 (s) + Cl2 (g) --> PCl5 (s) + energy

Based upon the graph above, what type of reaction is this?

Based upon the graph above, what type of reaction is this?

In the graph above, what does D represent?

Which of the following represents an exothermic reaction?

Which of the following represents an exothermic reaction?

The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below? (Hint: coefficient plays a role)H2O2(g) → H2O(g) + ½O2(g)

Approximate values of the average bond enthalpies, in kJ/mol, of three substances are:H-H = 430, F-F = 155, H-F = 565What is the enthalpy change in kJ for this reaction: 2HF → H2 + F2

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Is this equation endo- or exo-thermic?
2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

Is this reaction endo- or exo-thermic?
NH₄NO₂ + energy --> N₂ (g) + 2H₂O (g)

Is this equation endo- or exo-thermic?
PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below? (Hint: coefficient plays a role)
H₂O₂(g) → H₂O(g) + ½O₂(g)

Approximate values of the average bond enthalpies, in kJ/mol, of three substances are:
H-H = 430, F-F = 155, H-F = 565
What is the enthalpy change in kJ for this reaction: 2HF → H₂ + F₂