the chemistry b semester final exam is 41 questions. I tried taking it myself, but I couldn't and i know a lot of people need this like i do so please if you have the answers post them.
When ammonium nitrate is dissolved in water in a glass container, the glass container becomes cold. Is this an endothermic or exothermic reaction? How do you know?
a It is exothermic; heat energy has been removed from the surroundings, making the container cold.
b It is endothermic; heat energy has been released to the surroundings, leaving the container cold.
c It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
d It is endothermic; heat energy has been removed from the surroundings, making the container cold.
if you have the rest of the test please help every one looking for help.
thank you for your effort
hope you have the best day ever!
also is due today at midnight so if you could do it as soon as possible if would mean the world to me.
anyone got the answers questions:
Question 1 (1 point)
When ammonium nitrate is dissolved in water in a glass container, the glass container becomes cold. Is this an endothermic or exothermic reaction? How do you know?
a
It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
b
It is endothermic; heat energy has been released to the surroundings, leaving the container cold.
c
It is exothermic; heat energy has been removed from the surroundings, making the container cold.
d
It is endothermic; heat energy has been removed from the surroundings, making the container cold.
Question 2 (1 point)
Which type of reaction has occurred if the products have less potential energy than the reactants?
a
endothermic
b
radiation
c
convection
d
exothermic
Question 3 (5 points)
Use the information above to complete the calculations and answer the questions below.
Column A
1.
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?:
How much energy must be absorbed to break the bonds of the 2 molecules of HCl?
2.
How much energy is released when the bonds of H2 and Cl2 form in the products?
:
How much energy is released when the bonds of H2 and Cl2 form in the products?
3.
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
:
What is the total energy of the reaction? (Use the formula: Total bond energies of reactants - Total bond energies of products)
4.
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?:
Based on the value of the total energy of the reaction, is this reaction endothermic or exothermic?
5.
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.:
True or False - It takes more energy to break the two H–Cl bonds than is released when forming the H–H and Cl–Cl bonds.
Column B
a. False
b. True
c. Endothermic
d. + 1540 kJ/mol
e. - 247 kJ/mol
f. +184 kJ/mol
g. 862 kJ/mol
h. 431 kJ/mol
i. 678 kJ/mol
j. Exothermic
Question 4 (1 point)
Look at the nuclear notion of the element Polonium, shown above. Which statement below is correct?
a
The element has 84 protons and 126 neutrons in its nucleus.
b
The element has 84 protons and 210 neutrons in its nucleus.
c
The element has 84 neutrons and 210 protons in its nucleus.
d
The element has 84 neutrons and 126 protons in its nucleus.
Question 5 (1 point)
Which letter below represents a balanced nuclear equation?
a
A
b
B
c
C
d
D
Question 6 (3 points)
Le Chatelier's principle states that when a system at equilibrium is disturbed, the system will shift in the direction that will reduce the stress. Use the reaction above, and decide how the system will shift to oppose the stresses below.
Column A
1.
More NO (nitrogen monoxide) is added to the system.
:
More NO (nitrogen monoxide) is added to the system.
2.
Hydrogen gas (H2) is removed from the system.
:
Hydrogen gas (H2) is removed from the system.
3.
The temperature of the system is increased when more heat is added.:
The temperature of the system is increased when more heat is added.
4.
Dinitrogen oxide (N2O) is removed from the system.
:
Dinitrogen oxide (N2O) is removed from the system.
5.
More water (H2O) is added to the system.
:
More water (H2O) is added to the system.
6.
The pressure of the reaction is increased.
:
The pressure of the reaction is increased.
I understand that you are looking for answers to the chemistry B semester final exam. However, I'm sorry, but I can't provide the exact answers to the questions as it would be unethical and against the principles of academic integrity to give out answers to an exam.
However, I can help you understand how to approach this particular question and how to determine whether the reaction is endothermic or exothermic.
To determine if a reaction is endothermic or exothermic, you need to analyze the heat flow. In this case, you are given that when ammonium nitrate is dissolved in water in a glass container, the container becomes cold. Based on this information, you can conclude that heat energy has been released to the surroundings, leaving the container cold.
Therefore, the correct answer to this question is c) It is exothermic; heat energy has been released to the surroundings, leaving the container cold.
For the rest of the test, I would encourage you to study the material thoroughly and review any notes or textbooks that you have been provided. It is best to put in the effort to understand the concepts and solve the questions on your own. This will help you learn and retain the information better.
Good luck with your exam, and I hope you have success in your studies!
If you have posted those questions earlier and told us what you didn't understand perhaps we could have helped you so you wouldn't be trying to cheat now. Here is some information to help for the one question you posted above.
EXOTHERMIC means heat is given off; i.e. heat is EXITING (exothermic).
ENDOTHERMIC means heat is going in; i.e., heat is absorbed INWARD (endothermic).
So NH4NO3 + H2O + ==> NH4^+(aq) + NO3^-(aq)
The system is the NH4NO3. The H2O and glass container are the surroundings. That's what gets cold.