Question 1

A reaction for which ΔE = -850 kJ is one in which products have 850 kJ ________ internal energy than the reactants,and products are ________ stable than the reactants.

Accepted Answer

The answer of A reaction for which ΔE = -850...

Question 2

Energy can be classified as either ________ energy (energy of motion)or ________ energy (stored energy).

Accepted Answer

The answer of Energy can be classified as either ________...

Question 3

Is a hydroelectric dam a form of kinetic or potential molecular energy?

Accepted Answer

The answer of Is a hydroelectric dam a form of...

Question 4

Is thermal energy a form of kinetic or potential molecular energy?

Accepted Answer

The answer of Is thermal energy a form of kinetic...

Question 5

A property whose value depends only on the present condition of the system and not how the system arrived at that condition is called a ________ function.

Accepted Answer

The answer of A property whose value depends only on...

Question 6

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant ________ and is expressed as ΔH when heat is transferred under constant ________ conditions.

Accepted Answer

The answer of Heat transferred in a chemical reaction or...

Question 7

Calculate Gibb's free energy and determine if the event is spontaneous or non-spontaneous for ΔH = 42 Jand ΔS = -111 J/K at 400 K.

Accepted Answer

Using the equation 
ΔG = ΔH - TΔS, 
we can calculate the Gibb's free energy: 
ΔG = 42 J - (400 K)(-111 J/K) 
ΔG = 42 J + 44,400 J 
ΔG = 44,442 J = 44.442 kJ 
Converting to kJ and keeping in mind that 1 kJ = 1000 J.
Since the value of ΔG is positive, the event is non-spontaneous. 
Therefore option B and D are the wrong choices. The correct answer is option A.

Question 8

In the reaction shown below,________ kJ of heat are released per mole of carbon dioxide(g)that is produced. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)ΔH = -2045 kJ

Accepted Answer

The answer of In the reaction shown below,________ kJ of...

Question 9

In the reaction below,is energy released or absorbed by the system? What is the sign of the energy change,E?
432 kJ + A + 2B → 3C

Accepted Answer

The answer of In the reaction below,is energy released or...

Question 10

Because the number of moles of gas are increasing from 6 to 7 in the reaction shown below,at constant pressure ΔE is predicted to be slightly ________ negative than ΔH. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)

Accepted Answer

The answer of Because the number of moles of gas...

Question 11

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease?
432 kJ + A + 2 B → 3 C

Accepted Answer

The answer of When the reaction below is performed in...

Question 12

The law of conservation of energy is also known as the ________ law of thermodynamics.

Accepted Answer

The answer of The law of conservation of energy is...

Question 13

Kinetic energy increases with increasing ________ and increasing ________.

Accepted Answer

The answer of Kinetic energy increases with increasing ________ and...

Question 14

Which is not a spontaneous process?

Accepted Answer

The freezing of water at 3°C is not a spontaneous process as it requires the input of energy to overcome the intermolecular forces of the water molecules and decrease their kinetic energy, leading to a decrease in entropy. The other options are all examples of spontaneous processes as they occur due to a natural tendency towards increased entropy or disorder.

Question 15

The sum of the potential and kinetic energies for every molecule or ion in a system is the ________ energy of the system and is given the symbol ________.

Accepted Answer

The answer of The sum of the potential and kinetic...

Question 16

________ energy is the kinetic energy of molecular motion.

Accepted Answer

The answer of ________ energy is the kinetic energy of...

Question 17

For the freezing of liquid hexane,C₆H_,at a given temperature and pressure,

Accepted Answer

When a liquid freezes, it releases heat (exothermic process, so ΔH is negative) and its disorder decreases (solid is more ordered than liquid, so ΔS is negative).

Question 18

The SI unit for energy is the ________.

Accepted Answer

The answer of The SI unit for energy is the...

Question 19

For the conversion of ice to water at 0°C and 1 atm,

Accepted Answer

During the conversion of ice to water at 0°C and 1 atm, the system absorbs heat from the surroundings, which increases the internal energy of the system (i.e., ΔH is positive). However, the conversion leads to an increase in the entropy of the system because the water molecules in liquid state are more disordered than those in solid ice (i.e., ΔS is positive). As the process occurs at a constant temperature and pressure, we can use the equation ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, T is temperature, and ΔS is the change in entropy. Since ΔH is positive and ΔS is positive, the sign of ΔG will depend on the temperature. At 0°C, the value of T is 273 K, and there is a slight negative value of ΔG indicating that the reaction is spontaneous (i.e., ΔG is zero or negative). Therefore, the correct choice is B.

Question 20

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Accepted Answer

When the stopcock is opened, the gas will move from the flask with higher pressure to the one with lower pressure. This process is irreversible and leads to an increase in disorder or entropy. Therefore, ΔS is positive. As there is no change in temperature, the change in enthalpy or heat content (ΔH) is zero. Hence, option B is the correct answer.

Quiz 9: Thermochemistry: Chemical Energy

A reaction for which ΔE = -850 kJ is one in which products have 850 kJ internal energy than the reactants,and products are stable than the reactants.

Energy can be classified as either energy (energy of motion)or energy (stored energy).

Is a hydroelectric dam a form of kinetic or potential molecular energy?

Is thermal energy a form of kinetic or potential molecular energy?

A property whose value depends only on the present condition of the system and not how the system arrived at that condition is called a ________ function.

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant and is expressed as ΔH when heat is transferred under constant conditions.

Calculate Gibb's free energy and determine if the event is spontaneous or non-spontaneous for ΔH = 42 Jand ΔS = -111 J/K at 400 K.

In the reaction shown below,________ kJ of heat are released per mole of carbon dioxide(g)that is produced. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)ΔH = -2045 kJ

In the reaction below,is energy released or absorbed by the system? What is the sign of the energy change,E? 432 kJ + A + 2B → 3C

Because the number of moles of gas are increasing from 6 to 7 in the reaction shown below,at constant pressure ΔE is predicted to be slightly ________ negative than ΔH. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease? 432 kJ + A + 2 B → 3 C

The law of conservation of energy is also known as the ________ law of thermodynamics.

Kinetic energy increases with increasing and increasing .

Which is not a spontaneous process?

The sum of the potential and kinetic energies for every molecule or ion in a system is the energy of the system and is given the symbol .

________ energy is the kinetic energy of molecular motion.

For the freezing of liquid hexane,C₆H_,at a given temperature and pressure,

The SI unit for energy is the ________.

For the conversion of ice to water at 0°C and 1 atm,

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Quiz 9: Thermochemistry: Chemical Energy

A reaction for which ΔE = -850 kJ is one in which products have 850 kJ ________ internal energy than the reactants,and products are ________ stable than the reactants.

Energy can be classified as either ________ energy (energy of motion)or ________ energy (stored energy).

Is a hydroelectric dam a form of kinetic or potential molecular energy?

Is thermal energy a form of kinetic or potential molecular energy?

A property whose value depends only on the present condition of the system and not how the system arrived at that condition is called a ________ function.

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant ________ and is expressed as ΔH when heat is transferred under constant ________ conditions.

Calculate Gibb's free energy and determine if the event is spontaneous or non-spontaneous for ΔH = 42 Jand ΔS = -111 J/K at 400 K.

In the reaction shown below,________ kJ of heat are released per mole of carbon dioxide(g)that is produced. C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(g)ΔH = -2045 kJ

In the reaction below,is energy released or absorbed by the system? What is the sign of the energy change,E? 432 kJ + A + 2B → 3C

Because the number of moles of gas are increasing from 6 to 7 in the reaction shown below,at constant pressure ΔE is predicted to be slightly ________ negative than ΔH. C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(g)

When the reaction below is performed in a water bath,will the temperature of the water bath increase or decrease? 432 kJ + A + 2 B → 3 C

The law of conservation of energy is also known as the ________ law of thermodynamics.

Kinetic energy increases with increasing ________ and increasing ________.

Which is not a spontaneous process?

The sum of the potential and kinetic energies for every molecule or ion in a system is the ________ energy of the system and is given the symbol ________.

________ energy is the kinetic energy of molecular motion.

For the freezing of liquid hexane,C6H,at a given temperature and pressure,

The SI unit for energy is the ________.

For the conversion of ice to water at 0°C and 1 atm,

He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

A reaction for which ΔE = -850 kJ is one in which products have 850 kJ internal energy than the reactants,and products are stable than the reactants.

Energy can be classified as either energy (energy of motion)or energy (stored energy).

Heat transferred in a chemical reaction or physical change is expressed as ΔE when the heat is transferred under constant and is expressed as ΔH when heat is transferred under constant conditions.

In the reaction shown below,________ kJ of heat are released per mole of carbon dioxide(g)that is produced. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)ΔH = -2045 kJ

Because the number of moles of gas are increasing from 6 to 7 in the reaction shown below,at constant pressure ΔE is predicted to be slightly ________ negative than ΔH. C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(g)

Kinetic energy increases with increasing and increasing .

The sum of the potential and kinetic energies for every molecule or ion in a system is the energy of the system and is given the symbol .

For the freezing of liquid hexane,C₆H_,at a given temperature and pressure,