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anonymous

  • one year ago

What is always true of a combustion reaction? Oxygen gas must be one of the reactants Carbon monoxide will be produced The reaction absorbs energy One reactant must contain chlorine

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  1. anonymous
    • one year ago
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    can some please answerthis thanks

  2. anonymous
    • one year ago
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    @iambatman @myininaya

  3. anonymous
    • one year ago
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    @dan815 @vera_ewing

  4. anonymous
    • one year ago
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    @zepdrix @Haseeb96

  5. anonymous
    • one year ago
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    The reactants of a combustion reaction are a fuel oxygen gas. When the fuel is organic the products are carbon dioxide and water. The reaction releases heat (energy).

  6. anonymous
    • one year ago
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    @peachpi what would choice be

  7. Photon336
    • one year ago
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    Carbon monoxide is the result of incomplete combustion, a combustion reaction where there's a lack of oxygen

  8. Photon336
    • one year ago
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    Oxygen gas must be one of the reactants for this reaction to happen.

  9. anonymous
    • one year ago
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    can you do this ? @photon336 Which answer best completes the sentence below? An example of a physical property is _____, while an example of a chemical property is _____. mass, volume color, boiling point density, reactivity flammability, length

  10. Photon336
    • one year ago
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    The way I understand it is that a Chemical property is one at the molecular level where the bonds are broken and formed to result in a new compound or substance, and its identity is changed. I believe density and reactivity are the best choices. reactivity is just as it implies, how something will react, that's definitely a chemical property,

  11. anonymous
    • one year ago
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    okay what about this If the reaction of 3.50 moles of lithium with excess hydrofluoric acid was able to produce 1.32 mol H2, what is the precent yield of the reaction? Unbalanced equation: Li + HF yields LiF + H2 75.4% 37.7% 18.9% 13.3%

  12. anonymous
    • one year ago
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    @Photon336

  13. Photon336
    • one year ago
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    Do you know how to balance the equation?

  14. anonymous
    • one year ago
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    alittle but but would the answer b the second choice ?

  15. Photon336
    • one year ago
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    Let's first balance it \[2Li + 2Hf --> 2LIF +H2\]

  16. Photon336
    • one year ago
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    Count the number of atoms on both sides, you see in the unbalanced you have 2 atoms of hydrogen on one side and one atom on the other so you multiply by two.

  17. anonymous
    • one year ago
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    Li + HF yields LiF + H2

  18. anonymous
    • one year ago
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    =2 Li + 2 HF = 2 LiF + H2

  19. anonymous
    • one year ago
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    @Photon336

  20. Photon336
    • one year ago
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    We know that HF is in excess so to do the calculation we need to use the limiting reagent the one that runs out in our case that's lithium. The molar ratio is 2:1 so we should theoretically get 3.50 li x (H2/2Li) = 1.75 mol of H2 from the equation. What we actually get is 1.32 So it's what you get form experiment over stiochiometry 1.32/1.75

  21. Photon336
    • one year ago
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    And that's 75.4%

  22. Photon336
    • one year ago
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    Does this make sense how I got it, you always have to balance your equation before you do any calculation

  23. anonymous
    • one year ago
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    yes

  24. anonymous
    • one year ago
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    okay what about this u know the answr? Which of the following is a double replacement reaction? K2S + CoCl2 yields 2KCl + CoS Ca + 2H2O yields Ca(OH)2 + H2 CaO + H2O yields Ca(OH)2 2KClO3 yields 2KCl + 3O2

  25. anonymous
    • one year ago
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    @Photon336

  26. Photon336
    • one year ago
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    Here's what happens in a double replacement reaction: AB + CD ---> AC + BD see what happened?

  27. anonymous
    • one year ago
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    ya so it would b c

  28. Photon336
    • one year ago
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    2KClO3 ---> 2KCL + 3O2 this is a decomposition reaction general formula: A----> B + C CaO + HOH ----> Ca(OH)2 this isn't double replacement either.

  29. anonymous
    • one year ago
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    so d would be the answer?

  30. anonymous
    • one year ago
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    @Photon336

  31. Photon336
    • one year ago
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    K2S + CoCl2 ---> 2KCl + CoS that's your double replacement reaction. Potassium K reacts with Cl and Co reacts with sulfur. Follows the formula I showed you earlier.

  32. Photon336
    • one year ago
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    Can you see why it's a?

  33. anonymous
    • one year ago
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    yes

  34. vera_ewing
    • one year ago
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    @Photon336 Can you please help me with my question?

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