Hl Chemistry Mid-term Form (4)
High Level AcademyGrade 9Mid-Term Exam16th of April
Questions and Answers
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- 15.
In the graph below, the rate of reaction at point A is the ________ (slowest, fastest, zero) because the amount of reactants particles is ________ (maximum, minimum, zero).
Correct Answer
fastest,faster
maximum,maxExplanation
At point A in the graph, the rate of reaction is the fastest because it has the steepest slope, indicating a rapid change in the concentration of reactants over time. This suggests that the reaction is occurring at a high rate. Additionally, the amount of reactant particles at point A is at its maximum, as indicated by the highest point on the graph. This means that there are a large number of reactant particles available to participate in the reaction, further supporting the idea that the reaction is happening at a fast rate.Rate this question:
- 16.
In the graph below, the rate of reaction at point C is the ________ (slowest, fastest, zero) because the amount of reactants particles is ________ (maximum, minimum, zero).
Correct Answer
zero,0
zero,0Explanation
The rate of reaction at point C is zero because there are no reactant particles present at that point. As a result, no reaction can occur, leading to a rate of zero.Rate this question:
- 17.
What is the energy change for this reaction? ________ KJ/mol
Correct Answer
-97Explanation
The energy change for this reaction is -97 KJ/mol. This means that the reaction releases 97 kilojoules of energy per mole of reactant. The negative sign indicates that the reaction is exothermic, meaning it releases heat.Rate this question:
- 18.
What is the bond energy of the C=O bond? ________
Correct Answer
841,+841Explanation
The bond energy of the C=O bond is 841 kJ/mol. This means that it requires 841 kJ of energy to break one mole of C=O bonds. The +841 indicates that this value is for the reverse reaction, where the C=O bond is formed and releases 841 kJ of energy.Rate this question:
- 19.
________
Correct Answer
zinc ethanoate - 20.
________ + ________
Correct Answer
calcium ethanoate,water
calcium ethanoate,waterExplanation
The given answer suggests that the blanks should be filled with "calcium ethanoate" and "water" twice, resulting in the sequence "calcium ethanoate, water, calcium ethanoate, water". This implies that the two blanks should be filled with the same set of substances, namely calcium ethanoate and water, repeated twice.Rate this question:
- 21.
________
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LiNO3,lino3 - 22.
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- 32.
For the salt (Y) prepared below, the solid X is ________ (soluble , insoluble) and the salt Y is ________ (soluble , insoluble).
Correct Answer
insoluble
solubleExplanation
The solid X is insoluble because it does not dissolve in the given solution. On the other hand, the salt Y is soluble because it dissolves in the given solution.Rate this question:
- 33.
State the colour of each indicator with Ammonia: 1- Universal indicator ________ 2- Methyl Orange ________
Correct Answer
blue
yellowExplanation
The universal indicator turns blue in the presence of ammonia, indicating the presence of a base. Methyl Orange turns yellow in the presence of ammonia, indicating a higher pH value.Rate this question:
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- 37.
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- 38.
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Hund's Rule Demystified: Electron Configuration Challenge
Hund's Rule Demystified: Electron Configuration Challenge
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