Question
Which event is an example of an exothermic reaction?(1 point)
Responses
combustion
combustion
melting ice
melting ice
evaporation
evaporation
decomposition
decomposition
Question 2
What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
(1 point)
Responses
- 506 kJ/mol, exothermic
- 506 kJ/mol, exothermic
506 kJ/mol, exothermic
506 kJ/mol, exothermic
-506 kJ/mol, endothermic
-506 kJ/mol, endothermic
506 kJ/mol, endothermic
506 kJ/mol, endothermic
Question 3
Which kind of reaction is shown in this image?
(1 point)
Responses
It is an exothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the system takes energy from the surroundings.
It is an endothermic reaction because the system takes energy from the surroundings.
It is an endothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the surroundings take energy from the system.
It is an exothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
Question 4
A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod then feels the outside of the container. It is cold to the touch. Which material is part of the system that absorbed the heat?(1 point)
Responses
the air
the air
the stirring rod
the stirring rod
the water
the water
the container
the container
Question 5
The energy of the H-H bond is 432 kJ/mol. The energy of the O=O bond is 498 kJ/mol. The energy of the O-H bond is 467 kJ/mol.
Which bond is the weakest?
(1 point)
Responses
H-H
H-H
O-O
O-O
O-H
O-H
O=O
O=O
Question 6
Is this system endothermic or exothermic? Why?
(1 point)
Responses
It is endothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is endothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is exothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is exothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is exothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is exothermic because more energy is needed to break up the reactants versus the amount given off by the products.
Question 7
Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?
(1 point)
Responses
NO
NO
CO
CO
CaBr
CaBr
NaCl
NaCl
Question 8
Which bond in the chart is the most stable?
(1 point)
Responses
C-F
C-F
H-F
H-F
C-Cl
C-Cl
H-Cl
H-Cl
Question 9
Which option is an example of energy transfer via radiation?(1 point)
Responses
a hot air balloon rising
a hot air balloon rising
using a heating pad to warm stiff muscles
using a heating pad to warm stiff muscles
melting ice in your hand
melting ice in your hand
sunlight warming a concrete sidewalk
sunlight warming a concrete sidewalk
Question 10
A closed system includes a cup of warm water and an ice cube that was just placed inside of it. Which statement describes the energy of the system?(1 point)
Responses
The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.
The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.
The total energy of the system will stay the same as the kinetic energy from the warm water decreases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water decreases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water increases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water increases the kinetic energy of molecules in the ice.
The total energy of the system will decrease as the warm water causes the ice molecules to lose kinetic energy.
The total energy of the system will decrease as the warm water causes the ice molecules to lose kinetic energy.
Question 11
Which energy transformation occurs in an exothermic reaction?(1 point)
Responses
There is a net flow of energy from the system out to the surroundings.
There is a net flow of energy from the system out to the surroundings.
Energy from the chemical bonds of the reactants is released from the surroundings.
Energy from the chemical bonds of the reactants is released from the surroundings.
Energy from the surroundings is stored in the chemical bonds of the products.
Energy from the surroundings is stored in the chemical bonds of the products.
There is a net flow of energy from the surroundings into the system.
There is a net flow of energy from the surroundings into the system.
Question 12
What is activation energy?(1 point)
Responses
the energy that must be added to a system to break the bonds of the reactants
the energy that must be added to a system to break the bonds of the reactants
the total potential energy of the bonds of the reactants in a system
the total potential energy of the bonds of the reactants in a system
the energy release when atomic bonds are broken
the energy release when atomic bonds are broken
the kinetic energy of the reactants of a system after the reaction has begun
the kinetic energy of the reactants of a system after the reaction has begun
Question 13
Vinegar (acetic acid) and baking soda (sodium bicarbonate) react in an endothermic reaction to produce sodium acetate, carbon dioxide, and water. Which statement justifies classifying the reaction as endothermic?(1 point)
Responses
The reaction needs a catalyst.
The reaction needs a catalyst.
The total potential energy of the reactants is less than the total potential energy of the products.
The total potential energy of the reactants is less than the total potential energy of the products.
The bonds in both the reactants and products are covalent bonds.
The bonds in both the reactants and products are covalent bonds.
The reaction produces water.
Responses
combustion
combustion
melting ice
melting ice
evaporation
evaporation
decomposition
decomposition
Question 2
What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
(1 point)
Responses
- 506 kJ/mol, exothermic
- 506 kJ/mol, exothermic
506 kJ/mol, exothermic
506 kJ/mol, exothermic
-506 kJ/mol, endothermic
-506 kJ/mol, endothermic
506 kJ/mol, endothermic
506 kJ/mol, endothermic
Question 3
Which kind of reaction is shown in this image?
(1 point)
Responses
It is an exothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the system takes energy from the surroundings.
It is an endothermic reaction because the system takes energy from the surroundings.
It is an endothermic reaction because the system takes energy from the surroundings.
It is an exothermic reaction because the surroundings take energy from the system.
It is an exothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
It is an endothermic reaction because the surroundings take energy from the system.
Question 4
A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod then feels the outside of the container. It is cold to the touch. Which material is part of the system that absorbed the heat?(1 point)
Responses
the air
the air
the stirring rod
the stirring rod
the water
the water
the container
the container
Question 5
The energy of the H-H bond is 432 kJ/mol. The energy of the O=O bond is 498 kJ/mol. The energy of the O-H bond is 467 kJ/mol.
Which bond is the weakest?
(1 point)
Responses
H-H
H-H
O-O
O-O
O-H
O-H
O=O
O=O
Question 6
Is this system endothermic or exothermic? Why?
(1 point)
Responses
It is endothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is endothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is exothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is exothermic because more energy is needed to break up the products versus the amount given off by the reactants.
It is exothermic because more energy is needed to break up the reactants versus the amount given off by the products.
It is exothermic because more energy is needed to break up the reactants versus the amount given off by the products.
Question 7
Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?
(1 point)
Responses
NO
NO
CO
CO
CaBr
CaBr
NaCl
NaCl
Question 8
Which bond in the chart is the most stable?
(1 point)
Responses
C-F
C-F
H-F
H-F
C-Cl
C-Cl
H-Cl
H-Cl
Question 9
Which option is an example of energy transfer via radiation?(1 point)
Responses
a hot air balloon rising
a hot air balloon rising
using a heating pad to warm stiff muscles
using a heating pad to warm stiff muscles
melting ice in your hand
melting ice in your hand
sunlight warming a concrete sidewalk
sunlight warming a concrete sidewalk
Question 10
A closed system includes a cup of warm water and an ice cube that was just placed inside of it. Which statement describes the energy of the system?(1 point)
Responses
The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.
The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.
The total energy of the system will stay the same as the kinetic energy from the warm water decreases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water decreases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water increases the kinetic energy of molecules in the ice.
The total energy of the system will stay the same as the kinetic energy from the warm water increases the kinetic energy of molecules in the ice.
The total energy of the system will decrease as the warm water causes the ice molecules to lose kinetic energy.
The total energy of the system will decrease as the warm water causes the ice molecules to lose kinetic energy.
Question 11
Which energy transformation occurs in an exothermic reaction?(1 point)
Responses
There is a net flow of energy from the system out to the surroundings.
There is a net flow of energy from the system out to the surroundings.
Energy from the chemical bonds of the reactants is released from the surroundings.
Energy from the chemical bonds of the reactants is released from the surroundings.
Energy from the surroundings is stored in the chemical bonds of the products.
Energy from the surroundings is stored in the chemical bonds of the products.
There is a net flow of energy from the surroundings into the system.
There is a net flow of energy from the surroundings into the system.
Question 12
What is activation energy?(1 point)
Responses
the energy that must be added to a system to break the bonds of the reactants
the energy that must be added to a system to break the bonds of the reactants
the total potential energy of the bonds of the reactants in a system
the total potential energy of the bonds of the reactants in a system
the energy release when atomic bonds are broken
the energy release when atomic bonds are broken
the kinetic energy of the reactants of a system after the reaction has begun
the kinetic energy of the reactants of a system after the reaction has begun
Question 13
Vinegar (acetic acid) and baking soda (sodium bicarbonate) react in an endothermic reaction to produce sodium acetate, carbon dioxide, and water. Which statement justifies classifying the reaction as endothermic?(1 point)
Responses
The reaction needs a catalyst.
The reaction needs a catalyst.
The total potential energy of the reactants is less than the total potential energy of the products.
The total potential energy of the reactants is less than the total potential energy of the products.
The bonds in both the reactants and products are covalent bonds.
The bonds in both the reactants and products are covalent bonds.
The reaction produces water.
Answers
Answered by
jeff
are you sure bot
Answered by
GPT-4o mini
Here are the answers to your questions:
**Question 1**: Which event is an example of an exothermic reaction?
**Response**: **combustion**
---
**Question 2**: What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
**Response**: **-506 kJ/mol, exothermic** (Note: The value should be negative for an exothermic reaction since energy is released.)
---
**Question 3**: Which kind of reaction is shown in this image?
**Response**: **It is an exothermic reaction because the surroundings take energy from the system.**
---
**Question 4**: A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod then feels the outside of the container. It is cold to the touch. Which material is part of the system that absorbed the heat?
**Response**: **the water**
---
**Question 5**: The energy of the H-H bond is 432 kJ/mol. The energy of the O=O bond is 498 kJ/mol. The energy of the O-H bond is 467 kJ/mol. Which bond is the weakest?
**Response**: **H-H** (since it has the lowest bond energy)
---
**Question 6**: Is this system endothermic or exothermic? Why?
**Response**: **It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.**
---
**Question 7**: Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?
**Response**: **NO** (the electronegativity difference is suitable for covalent bonding)
---
**Question 8**: Which bond in the chart is the most stable?
**Response**: **C-F** (typically one of the strongest and most stable bonds among the listed options)
---
**Question 9**: Which option is an example of energy transfer via radiation?
**Response**: **sunlight warming a concrete sidewalk**
---
**Question 10**: A closed system includes a cup of warm water and an ice cube that was just placed inside of it. Which statement describes the energy of the system?
**Response**: **The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.**
---
**Question 11**: Which energy transformation occurs in an exothermic reaction?
**Response**: **There is a net flow of energy from the system out to the surroundings.**
---
**Question 12**: What is activation energy?
**Response**: **the energy that must be added to a system to break the bonds of the reactants**
---
**Question 13**: Vinegar (acetic acid) and baking soda (sodium bicarbonate) react in an endothermic reaction to produce sodium acetate, carbon dioxide, and water. Which statement justifies classifying the reaction as endothermic?
**Response**: **The total potential energy of the reactants is less than the total potential energy of the products.**
---
Let me know if you need further clarification or assistance!
**Question 1**: Which event is an example of an exothermic reaction?
**Response**: **combustion**
---
**Question 2**: What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
**Response**: **-506 kJ/mol, exothermic** (Note: The value should be negative for an exothermic reaction since energy is released.)
---
**Question 3**: Which kind of reaction is shown in this image?
**Response**: **It is an exothermic reaction because the surroundings take energy from the system.**
---
**Question 4**: A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod then feels the outside of the container. It is cold to the touch. Which material is part of the system that absorbed the heat?
**Response**: **the water**
---
**Question 5**: The energy of the H-H bond is 432 kJ/mol. The energy of the O=O bond is 498 kJ/mol. The energy of the O-H bond is 467 kJ/mol. Which bond is the weakest?
**Response**: **H-H** (since it has the lowest bond energy)
---
**Question 6**: Is this system endothermic or exothermic? Why?
**Response**: **It is endothermic because more energy is needed to break up the reactants versus the amount given off by the products.**
---
**Question 7**: Which compound is most likely to be held together by a covalent bond based on the electronegativity difference between its two atoms?
**Response**: **NO** (the electronegativity difference is suitable for covalent bonding)
---
**Question 8**: Which bond in the chart is the most stable?
**Response**: **C-F** (typically one of the strongest and most stable bonds among the listed options)
---
**Question 9**: Which option is an example of energy transfer via radiation?
**Response**: **sunlight warming a concrete sidewalk**
---
**Question 10**: A closed system includes a cup of warm water and an ice cube that was just placed inside of it. Which statement describes the energy of the system?
**Response**: **The total energy of the system will decrease as the ice causes the warm water molecules to lose kinetic energy.**
---
**Question 11**: Which energy transformation occurs in an exothermic reaction?
**Response**: **There is a net flow of energy from the system out to the surroundings.**
---
**Question 12**: What is activation energy?
**Response**: **the energy that must be added to a system to break the bonds of the reactants**
---
**Question 13**: Vinegar (acetic acid) and baking soda (sodium bicarbonate) react in an endothermic reaction to produce sodium acetate, carbon dioxide, and water. Which statement justifies classifying the reaction as endothermic?
**Response**: **The total potential energy of the reactants is less than the total potential energy of the products.**
---
Let me know if you need further clarification or assistance!
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