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Chemistry

Use the periodic table and example bond table to answer the question.

Example Bond Energies of Ionic Compounds:
Li-F = 1036 kJ/mol
Li-Br = 807 kJ/mol
Na-F = 923 kJ/mol
Na-Br = 747 kJ/mol

Given the general trend with bond energies, which compounds would have the smallest bond energy?
A. Cs-Br
B. K-Br
C.Cs-F
D.K-F

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  1. as you go down a group , there is lower bond energy

    Cs and Br are further down their respective groups

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  2. 1. Cs-Br
    2. Fr–Cl = 2.46
    3.Hotter molecules have more kinetic energy.
    4.The reaction is exothermic.
    5. More bond energy is absorbed on the reactants side than is released on the products side.
    6. an exothermic reaction
    7. Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
    8. Heat must be released by the products in order to convert from the reactants.
    9. Cooling a purple solution will turn it pink.
    10. Both are flexible, but one conducts electricity while the other insulates.
    11. high pressure, high temperature water extraction
    12. reducing environmental impact
    13. 15
    14. The number of atoms, type of elements, and mass of reactants and products are equal.
    15. 64 grams
    16. 1.503×1023
    17. The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.
    18. Fission is a process in which a large nucleus is split into smaller nuclei.
    19. beta-minus decay
    20. alpha decay
    21. Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.
    22. cause: acid rain
    consequence: destruction of crops
    23. toxic bacteria in the water supply
    24. It reaches hard to get to oil and gas deposits.

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  3. samado is 100% correct! thank you!

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  4. I just finished the test, here's some of the questions that I missed and aren't on here or any other site I tried:

    4. Substance A reacts spontaneously with substance B at room temperature. Substance A reacts with substance C at room temperature only in the presence of a catalyst. Which statement best explains this difference?
    > The reaction between substances A and B has a lower activation energy than the reaction between substances B and C.

    12. To make high-quality tools that last, it is necessary to combine steel with other elements. Which combination is the best choice for the creation of a hammer?
    > steel + vanadium for shock absorption

    18. A large room is filled with mousetraps, each trap set with two plastic balls on the arm of the trap. A single plastic ball is thrown into the room, setting off one trap. This causes three plastic balls to be in the air, which then land and set off three other traps, and so on. How could this be evaluated as a model for fission?
    > The plastic balls are a good representation of neutrons, but there is no splitting of nuclei as happens in fission.

    If y'all want to double check any other questions, I'll try to reply! Good luck finishing the semester!!

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  5. hey kkzden, do you have question #2? Potassium carbonate (K2CO3) has one potassium atom bonded to carbon, and that carbon is also bonded to three oxygens. Their electronegativities are shown in the list:

    *K:0.08
    *C:2.55
    *O:3.44

    How would you describe the bonds (K-C and C-O) in this molecule?

    Question #3
    What is true about kinetic energy?

    Question#11 Select the correct answer from the list
    _______________is a method of extraction of pomace that is cheaper, enviromentally friendly, has reduced waste, and requires simpler facilities.

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  6. @ student, I just finished the test and these are the answers for the questions you asked for:

    2) K-C is ionic, and C-O is polar covalent
    3) All molecules are in constant motion, so they all have some kinetic energy
    11) High pressure, high temperature water extraction

    I know you're probably finished with your test by now, but I hope you got a good grade and I hope this helps everyone else reading this!!

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  7. I just finished the test and got a 100%. These are the answers to Honors Chemistry Final

    1. Cs-Br
    2. K-C is ionic, and C-O is polar covalent
    3. All molecules are in constant motion, so they all have some kinetic energy
    4. The reaction between substances A and B has a lower activation energy than the reaction between substances B and C.
    5. More bond energy is absorbed on the reactants side than is released on the products side.
    6. an exothermic reaction
    7. Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
    8. Heat must be released by the products in order to convert from the reactants.
    9. Cooling a purple solution will turn it pink.
    10. Both are flexible, but one conducts electricity while the other insulates.
    11. High pressure, high temperature water extraction
    12. steel + vanadium for shock absorption
    13. 15
    14. The number of atoms, type of elements, and mass of reactants and products are equal.
    15. 64 grams
    16. 1.503×1023
    17. The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.
    18. The plastic balls are a good representation of neutrons, but there is no splitting of nuclei as happens in fission.
    19. beta-minus decay
    20. alpha decay
    21. Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.
    22. cause: acid rain
    consequence: destruction of crops
    23. toxic bacteria in the water supply
    24. It reaches hard to get to oil and gas deposits.

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  8. Samado, I pray for you to live longer, stay healthy, be successful, stay happy and always be kind. Thank you so so so much much much for all the answers. You saved my face from getting acne and from becoming crazy. I cannot thank you enough for saving my life. Please stay the same and don't change. You are truly not a helper but a doctor who cures patients of too much stress. I also would like to thank all the people who verified the answers or give answers like samado. Thank you so much, everyone.

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  9. Stuff like this gives me serotonin, its nice to see everyone helping eachother

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  10. people like this are the reason i pass :)

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  11. i love u all

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  12. i wanna give whoever just helped me pass chem with an A a big ole kiss in the mouth

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  13. lol

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  14. please tell me samado is reading this i need to pay him for he is god

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  15. oh and love all of u stay safe and thank samado! worship him!

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