Question
Question 1
A)Which phrase describes the initial input of energy that is needed to break bonds in a chemical reaction?(1 point)
Responses
potential energy
potential energy
activation energy
activation energy
bond energy
bond energy
kinetic energy
kinetic energy
Question 2
A)
Use the diagram to answer the question.
A graph with the vertical axis labeled, energy (kJ per mol) shows energy of 2H2 + O2 as a horizontal line near the top at energy level 0 and the energy of 2H2O as a horizontal line near the bottom at energy level negative 571.6 kJ per mol.
The diagram represents the reaction of hydrogen gas and oxygen gas to produce water. Which statement best describes the reaction?
(1 point)
Responses
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is exothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is exothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is endothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.
Question 3
A)Hydrogen gas (H2) and oxygen gas (O2) combine. Which change occurs that indicates a release of bond energy?(1 point)
Responses
a strong odor
a strong odor
the formation of CO2 bubbles
the formation of CO 2 bubbles
a loud popping noise
a loud popping noise
the appearance of color in the gases
the appearance of color in the gases
Question 4
A)Which statement explains why the electrolysis of hydrochloric acid (HCl) is an endothermic reaction?(1 point)
Responses
It requires bonds to be broken.
It requires bonds to be broken.
It requires electricity to sustain the reaction.
It requires electricity to sustain the reaction.
It releases more energy than it absorbs.
It releases more energy than it absorbs.
It results in two distinct gases, not liquids or solids.
It results in two distinct gases, not liquids or solids.
Question 5
A)
Use the chemical equation to answer the question.
2H2(g) + O2(g) → 2H2O(l)
Which statement describes the breaking and forming of bonds in the reaction?
(1 point)
Responses
The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.
The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.
The reaction requires breaking four O–H bonds, and then forming one H–H bond and two O=O bonds.
The reaction requires breaking four O–H bonds, and then forming one H–H bond and two O=O bonds.
The reaction requires breaking one H–H bond and two O=O bonds, and then forming four O–H bonds.
The reaction requires breaking one H–H bond and two O=O bonds, and then forming four O–H bonds.
The reaction requires breaking four O–H bonds, and then forming one O=O bond and two H–H
A)Which phrase describes the initial input of energy that is needed to break bonds in a chemical reaction?(1 point)
Responses
potential energy
potential energy
activation energy
activation energy
bond energy
bond energy
kinetic energy
kinetic energy
Question 2
A)
Use the diagram to answer the question.
A graph with the vertical axis labeled, energy (kJ per mol) shows energy of 2H2 + O2 as a horizontal line near the top at energy level 0 and the energy of 2H2O as a horizontal line near the bottom at energy level negative 571.6 kJ per mol.
The diagram represents the reaction of hydrogen gas and oxygen gas to produce water. Which statement best describes the reaction?
(1 point)
Responses
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is exothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is exothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is endothermic.
More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is endothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.
More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.
Question 3
A)Hydrogen gas (H2) and oxygen gas (O2) combine. Which change occurs that indicates a release of bond energy?(1 point)
Responses
a strong odor
a strong odor
the formation of CO2 bubbles
the formation of CO 2 bubbles
a loud popping noise
a loud popping noise
the appearance of color in the gases
the appearance of color in the gases
Question 4
A)Which statement explains why the electrolysis of hydrochloric acid (HCl) is an endothermic reaction?(1 point)
Responses
It requires bonds to be broken.
It requires bonds to be broken.
It requires electricity to sustain the reaction.
It requires electricity to sustain the reaction.
It releases more energy than it absorbs.
It releases more energy than it absorbs.
It results in two distinct gases, not liquids or solids.
It results in two distinct gases, not liquids or solids.
Question 5
A)
Use the chemical equation to answer the question.
2H2(g) + O2(g) → 2H2O(l)
Which statement describes the breaking and forming of bonds in the reaction?
(1 point)
Responses
The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.
The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.
The reaction requires breaking four O–H bonds, and then forming one H–H bond and two O=O bonds.
The reaction requires breaking four O–H bonds, and then forming one H–H bond and two O=O bonds.
The reaction requires breaking one H–H bond and two O=O bonds, and then forming four O–H bonds.
The reaction requires breaking one H–H bond and two O=O bonds, and then forming four O–H bonds.
The reaction requires breaking four O–H bonds, and then forming one O=O bond and two H–H
Answers
GPT-4o mini
Here are the answers to your questions based on the provided information:
**Question 1:**
The initial input of energy that is needed to break bonds in a chemical reaction is called:
- **activation energy**
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**Question 2:**
Based on the graph you described, which shows a decrease in energy during the reaction, the best statement is:
- **More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.**
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**Question 3:**
The change that occurs indicating a release of bond energy when hydrogen gas and oxygen gas combine is:
- **a loud popping noise**
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**Question 4:**
The explanation for why the electrolysis of hydrochloric acid (HCl) is an endothermic reaction is:
- **It requires electricity to sustain the reaction.**
---
**Question 5:**
The correct statement about the breaking and forming of bonds in the given reaction is:
- **The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.**
---
Feel free to ask if you have more questions!
**Question 1:**
The initial input of energy that is needed to break bonds in a chemical reaction is called:
- **activation energy**
---
**Question 2:**
Based on the graph you described, which shows a decrease in energy during the reaction, the best statement is:
- **More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.**
---
**Question 3:**
The change that occurs indicating a release of bond energy when hydrogen gas and oxygen gas combine is:
- **a loud popping noise**
---
**Question 4:**
The explanation for why the electrolysis of hydrochloric acid (HCl) is an endothermic reaction is:
- **It requires electricity to sustain the reaction.**
---
**Question 5:**
The correct statement about the breaking and forming of bonds in the given reaction is:
- **The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O–H bonds.**
---
Feel free to ask if you have more questions!