Question
Compound Electronegativity Difference
CO 0.89
NaCl 2.23
NO 0.04
CaBr 1.96
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
NaCl
NaCl
CaBr
CaBr
NO
NO
COUse the table of information about bond energies to answer the question.
Bond Energy (kJ/mol)
C–Cl 339
C–F 485
H–Cl 427
H–F 565
Which bond is more stable?
(1 point)
Responses
H–Cl
H–Cl
H–F
H–F
C–F
C–F
C–ClWhich option is an example of energy transfer via radiation?(1 point)
Responses
sunlight warming a concrete sidewalk
sunlight warming a concrete sidewalk
melting ice in your hand
melting ice in your hand
using a heating pad to warm stiff muscles
using a heating pad to warm stiff muscles
a hot air balloon risingQuestion
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 over time?(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 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 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.
The total energy of the system will stay the same as kinetic energy from the warm water decreases the kinetic energy of molecules in the ice. Which best describes the energy transfer that occurs in an exothermic chemical reaction?(1 point)
Responses
There is no energy transfer during an exothermic chemical reaction.
There is no energy transfer during an exothermic chemical reaction.
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.
All of the energy cycles within the system.
All of the energy cycles within the system.
There is a net flow of energy from the surroundings into the system.What is activation energy?(1 point)
Responses
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 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
the energy released when atomic bonds are broken
the energy released when atomic bonds are broken
the energy that must be added to a system to break the bonds of the reactants
put a b c or d
CO 0.89
NaCl 2.23
NO 0.04
CaBr 1.96
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
NaCl
NaCl
CaBr
CaBr
NO
NO
COUse the table of information about bond energies to answer the question.
Bond Energy (kJ/mol)
C–Cl 339
C–F 485
H–Cl 427
H–F 565
Which bond is more stable?
(1 point)
Responses
H–Cl
H–Cl
H–F
H–F
C–F
C–F
C–ClWhich option is an example of energy transfer via radiation?(1 point)
Responses
sunlight warming a concrete sidewalk
sunlight warming a concrete sidewalk
melting ice in your hand
melting ice in your hand
using a heating pad to warm stiff muscles
using a heating pad to warm stiff muscles
a hot air balloon risingQuestion
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 over time?(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 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 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.
The total energy of the system will stay the same as kinetic energy from the warm water decreases the kinetic energy of molecules in the ice. Which best describes the energy transfer that occurs in an exothermic chemical reaction?(1 point)
Responses
There is no energy transfer during an exothermic chemical reaction.
There is no energy transfer during an exothermic chemical reaction.
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.
All of the energy cycles within the system.
All of the energy cycles within the system.
There is a net flow of energy from the surroundings into the system.What is activation energy?(1 point)
Responses
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 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
the energy released when atomic bonds are broken
the energy released when atomic bonds are broken
the energy that must be added to a system to break the bonds of the reactants
put a b c or d
Answers
There are no human answers yet.
Answered by
GPT-4o mini
1. **Most likely to be held together by a covalent bond:**
**NO** (covalent bonds typically have electronegativity differences of less than 1.7)
2. **More stable bond:**
**H–F** (H–F has a higher bond energy than H–Cl or C–Cl)
3. **Example of energy transfer via radiation:**
**sunlight warming a concrete sidewalk**
4. **Energy of the closed system over time:**
**The total energy of the system will stay the same as kinetic energy from the warm water increases the kinetic energy of molecules in the ice.**
5. **Energy transfer in an exothermic reaction:**
**There is a net flow of energy from the system out to the surroundings.**
6. **Activation energy:**
**the energy that must be added to a system to break the bonds of the reactants**
**NO** (covalent bonds typically have electronegativity differences of less than 1.7)
2. **More stable bond:**
**H–F** (H–F has a higher bond energy than H–Cl or C–Cl)
3. **Example of energy transfer via radiation:**
**sunlight warming a concrete sidewalk**
4. **Energy of the closed system over time:**
**The total energy of the system will stay the same as kinetic energy from the warm water increases the kinetic energy of molecules in the ice.**
5. **Energy transfer in an exothermic reaction:**
**There is a net flow of energy from the system out to the surroundings.**
6. **Activation energy:**
**the energy that must be added to a system to break the bonds of the reactants**
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