Bond Energy Questions: Trivia Quiz
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What do you know about bond energy? Bond energy is the measure of a chemical bond to strengthen a chemical bond. This boost means that it demonstrates bond energy tells us how likely a pair of atoms is to remain bonded in the presence of certain types of life. Energy is always required to break a bond, and this is called bond energy. Try this quiz and see how much you know about bond energy.
Questions and Answers
- 1.
∆H°f stands for the ……………
- A.
Specific heat of substance
- B.
Heat capacity of substance
- C.
Heat of reaction for chemical reaction
- D.
Standard heat of formation for a compound
Correct Answer
D. Standard heat of formation for a compoundExplanation
∆H°f stands for the standard heat of formation for a compound. This term refers to the amount of heat released or absorbed when one mole of a compound is formed from its elements in their standard states. It is a measure of the stability of the compound and can be used to calculate the heat of reaction for chemical reactions involving that compound. The specific heat of a substance refers to the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius. The heat capacity of a substance refers to the amount of heat required to raise the temperature of the entire substance by one degree Celsius.Rate this question:
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- 2.
If a solid substance is placed in a beaker on a hot plate and the temperature is recorded until it becomes a liquid completely what would you observe?
- A.
The temperature would rise and then hold steady
- B.
The temperature would fall continuously
- C.
The temperature would rise continuously
- D.
the temperature would rise and then fall
Correct Answer
A. The temperature would rise and then hold steadyExplanation
When a solid substance is placed on a hot plate, the heat from the plate is transferred to the substance, causing its temperature to rise. As the substance continues to absorb heat, its particles gain energy and begin to vibrate more rapidly. Eventually, the substance reaches its melting point, at which it starts to transition from a solid to a liquid state. During this phase change, the temperature of the substance remains constant, as the added heat is being used to break the intermolecular forces holding the solid together rather than increasing the temperature. Once the substance has completely melted, the temperature will hold steady until further heat is applied. Therefore, the correct answer is that the temperature would rise and then hold steady.Rate this question:
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- 3.
which is more dangerous to your body …………..
- A.
Water vapour fires
- B.
Hot water fires
Correct Answer
A. Water vapour firesExplanation
Water vapour fires are more dangerous to the body compared to hot water fires. Water vapour fires occur when water is heated to a high temperature and turns into steam. The high temperature of the steam can cause severe burns and scalding to the skin, leading to permanent damage and pain. In contrast, hot water fires involve water at a lower temperature and pose a lower risk of burns and injuries. Therefore, water vapour fires can cause more harm to the body than hot water fires.Rate this question:
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- 4.
bond energy is heat require to breaking and forming bonds in three mole of substance
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because bond energy refers to the amount of energy required to break a bond, not to form one. It is the energy released when a bond is formed. Therefore, the statement that bond energy is the heat required to break and form bonds in three moles of a substance is incorrect.Rate this question:
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- 5.
the standard condition for the reaction are ……………
- A.
Pressure 1 atm ,temperature 0°C
- B.
Pressure 1 atm ,temperature 100°C
- C.
Pressure 1 atm ,temperature 25°C
- D.
Pressure 1 atm ,temperature 273°C
Correct Answer
C. Pressure 1 atm ,temperature 25°CExplanation
The standard condition for a reaction is typically defined as a pressure of 1 atm and a temperature of 25°C. This is because these conditions are considered to be standard or normal for most chemical reactions. The specific temperature and pressure values are chosen to provide a consistent reference point for comparing and measuring reactions.Rate this question:
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- 6.
what occurs when the temperature of 10.0g of water is changed from 15.5 to 14.5 degree Celsius
- A.
The water absorb 42joule
- B.
the water release 4200joule
- C.
The water absorb 4200joule
- D.
The water release 42 joule
Correct Answer
D. The water release 42 jouleExplanation
When the temperature of water decreases, it releases heat energy. In this case, the temperature of the water decreases from 15.5 to 14.5 degrees Celsius, indicating that the water is losing heat. The correct answer states that the water releases 42 joules of heat energy, which is consistent with the concept of heat transfer during a decrease in temperature.Rate this question:
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- 7.
When the energy of bond breaking in the reactant is lower than the energy of bond formation in the product , the reaction will be …………….
- A.
Exothermic
- B.
Endothermic
Correct Answer
A. ExothermicExplanation
When the energy of bond breaking in the reactant is lower than the energy of bond formation in the product, it means that energy is released during the reaction. This indicates an exothermic reaction, where heat is given off to the surroundings. In an exothermic reaction, the products have lower energy than the reactants, resulting in a release of energy in the form of heat.Rate this question:
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- 8.
when bond formed ,kinetic energy ………….., to make molecule ……..
- A.
increase, unstable
- B.
Increase, stable
- C.
Decrease, stable
- D.
Decrease, unstable
Correct Answer
C. Decrease, stableExplanation
When a bond is formed, kinetic energy decreases to make the molecule stable. This is because during bond formation, energy is released as the atoms come closer together and form a more stable arrangement. The decrease in kinetic energy signifies a decrease in the motion of the atoms, indicating that they are becoming more stable in their bonded state.Rate this question:
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- 9.
heat of formation of hydrogen halides : H-F ∆H°f = -271kj /mol , H-Br ∆H°f = -36 kj/mol, H-I ∆H°f = +26Kj/mol , H-Cl , ∆H°f = -92KJ/mol , which bond is less stable ?
- A.
H-I
- B.
H-Cl
- C.
H-Br
- D.
H-F
Correct Answer
A. H-IExplanation
The bond that is less stable is H-I. This is because the heat of formation (∆H°f) for H-I is positive (+26 kJ/mol), indicating that energy is absorbed or required to form the H-I bond. In contrast, the heat of formation for the other hydrogen halides (H-F, H-Br, H-Cl) is negative, indicating that energy is released or released during the formation of these bonds. Therefore, H-I is less stable compared to the other hydrogen halides.Rate this question:
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- 10.
heat content changed by ………..
- A.
Chemical state
- B.
Physical state
- C.
Chemical & physical state
- D.
neither physical nor chemical state
Correct Answer
C. Chemical & physical stateExplanation
The correct answer is "chemical & physical state". This is because the heat content can change when there is a change in both the chemical composition and the physical state of a substance. For example, when a substance undergoes a chemical reaction, there may be a release or absorption of heat. Additionally, when a substance changes from one physical state to another (e.g. solid to liquid or liquid to gas), there can also be a change in heat content. Therefore, both the chemical and physical state of a substance can affect its heat content.Rate this question:
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- 11.
Which picture below shows the enthalpy diagram for a one-step exothermic reaction ………………
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1 -
- 12.
energy diagram for reaction which is more stable , …………….
- A.
1
- B.
2
Correct Answer
B. 2 -
- 13.
the change in heat content = …………..
- A.
Heat content of reactant + heat content of product
- B.
Heat content of reactant – heat content of product
- C.
Heat content of product
- D.
Heat content of product –heat content of reactant
Correct Answer
D. Heat content of product –heat content of reactantExplanation
The change in heat content is calculated by subtracting the heat content of the reactant from the heat content of the product. This is because the change in heat content represents the difference in energy between the reactant and the product. By subtracting the heat content of the reactant from the heat content of the product, we can determine the amount of energy that is gained or lost during the reaction.Rate this question:
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- 14.
in the reaction X2+Y2 → 2XY , if bond X-X &Y-Y are weak bond , X-Y is strong bond , the type of reaction is ……….
- A.
Exothermic reaction
- B.
Endothermic reaction
Correct Answer
A. Exothermic reactionExplanation
In the given reaction, X2 and Y2 molecules combine to form 2XY molecules. Since X-X and Y-Y bonds are weak, it implies that breaking these bonds requires less energy. On the other hand, the formation of X-Y bond is strong, indicating that it releases more energy when it is formed. This suggests that the overall reaction releases energy in the form of heat, making it an exothermic reaction.Rate this question:
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- 15.
100.0 g of NH4NO3 is placed in 100g of water at 25°C cooling it to 18.0°C ,calculate the change in enthalpy of solution ?
- A.
3.657
- B.
-2.3408
- C.
-3.657
- D.
2.3408
Correct Answer
D. 2.3408Explanation
The change in enthalpy of solution can be calculated using the formula:
ΔH = q / m
Where ΔH is the change in enthalpy, q is the heat gained or lost, and m is the mass of the substance. In this case, the heat lost by the water can be calculated using the formula:
q = mcΔT
Where q is the heat lost, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.
Substituting the given values into the formulas, we can calculate the change in enthalpy of solution to be 2.3408.Rate this question:
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- 16.
In the following reaction : CH4(g)+2O2(g) ....∆...... CO2 (g) +2H2O (l) ∆H = -890 KJ/mol , the released heat from combustion of 3 mol of methane is …………..kj
- A.
- 890
- B.
2670
- C.
1780
- D.
-2070
Correct Answer
B. 2670Explanation
The given reaction is the combustion of methane, where methane reacts with oxygen to produce carbon dioxide and water. The enthalpy change (∆H) for this reaction is -890 KJ/mol, which means that 890 KJ of heat is released per mole of methane combusted.
To find the heat released from the combustion of 3 moles of methane, we can multiply the ∆H value by the number of moles.
∆H = -890 KJ/mol
Number of moles = 3
Heat released = ∆H x Number of moles = -890 KJ/mol x 3 mol = -2670 KJ
Therefore, the correct answer is 2670 KJ.Rate this question:
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- 17.
A piece of candy has 5 calorie , if it could be burned leaving nothing but CO2 &H2O ,how much would it give off?
- A.
500 calorie
- B.
5000 joule
- C.
None of them
- D.
5 kilocalorie
Correct Answer
D. 5 kilocalorieExplanation
The candy has 5 calories. When it is burned, it will give off 5 kilocalories.Rate this question:
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- 18.
when green copper carbonate decomposes , the equation is : Is the reaction exothermic or endothermic ?
- A.
Exothermic reaction
- B.
Endothermic reaction
Correct Answer
B. Endothermic reactionExplanation
The given correct answer states that the reaction is an endothermic reaction. This means that the decomposition of green copper carbonate requires an input of energy in order to occur. Endothermic reactions typically absorb heat from their surroundings, causing a decrease in temperature.Rate this question:
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