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Q 1/20
Score 0
Which of the following statements correctly describes an exothermic reaction?
30
It does not involve any energy change.
It requires an input of heat to occur.
It releases energy to the surroundings.
It absorbs energy from the surroundings.
Q 2/20
Score 0
According to Hess's Law, how is the total enthalpy change of a reaction related to the enthalpy changes of its individual steps?
30
The total enthalpy change is the average of the enthalpy changes.
The total enthalpy change is the sum of the enthalpy changes for each step.
The total enthalpy change is equal to zero.
The total enthalpy change depends only on the first step.
20 questions
Q.
Which of the following statements correctly describes an exothermic reaction?
1
30 sec
Q.
According to Hess's Law, how is the total enthalpy change of a reaction related to the enthalpy changes of its individual steps?
2
30 sec
Q.
Which of the following processes is an example of an endothermic reaction?
3
30 sec
Q.
What happens to the temperature of the surroundings during an exothermic reaction?
4
30 sec
Q.
Which of the following best describes an endothermic process?
5
30 sec
Q.
Which type of reaction is known to absorb energy from the environment, resulting in a decrease in temperature?
6
30 sec
Q.
In which of the following scenarios would Hess's Law be applicable?
7
30 sec
Q.
What is the primary reason that some reactions are classified as exothermic?
8
30 sec
Q.
Which of the following statements about enthalpy changes is true?
9
30 sec
Q.
What is the enthalpy change when a reaction absorbs heat from the surroundings called?
10
30 sec
Q.
What type of reaction absorbs heat from its surroundings?
11
30 sec
Q.
According to Hess's Law, the total enthalpy change of a chemical reaction is the same regardless of the number of steps taken to complete the reaction. What does this imply about the reaction path?
12
30 sec
Q.
Which of the following is an example of an exothermic reaction?
13
30 sec
Q.
In a reaction where the enthalpy change is negative, what type of process is occurring?
14
30 sec
Q.
What is the enthalpy change of a reaction when 100 kJ of heat is absorbed from the surroundings?
15
30 sec
Q.
When ammonia ( ext{NH}_3) is formed from nitrogen and hydrogen gases, heat is released. What type of reaction is this?
16
30 sec
Q.
In a chemical reaction, if the products have lower energy than the reactants, what can be inferred about the enthalpy change?
17
30 sec
Q.
Which law states that the enthalpy change of a reaction is the same whether it occurs in one step or multiple steps?
18
30 sec
Q.
What is the main characteristic of an endothermic reaction regarding heat transfer?
19
30 sec
Q.
Which of the following is true about exothermic reactions?
