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    Halogen Displacement Reactions

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    Aneta Katsarova
    This document discusses halogen displacement reactions to determine the reactivity trend of the halogens (F, Cl, Br, I). When a more reactive halogen is mixed with a salt solution containing a less reactive halogen, the more reactive halogen will displace the other from the salt, causing a color change that indicates a reaction occurred. By observing which halogen causes color changes in different salt solutions, the reactivity order of the halogens can be determined.

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    Halogen Displacement Reactions

    Uploaded by

    Aneta Katsarova
    94 views2 pages
    This document discusses halogen displacement reactions to determine the reactivity trend of the halogens (F, Cl, Br, I). When a more reactive halogen is mixed with a salt solution containing a less reactive halogen, the more reactive halogen will displace the other from the salt, causing a color change that indicates a reaction occurred. By observing which halogen causes color changes in different salt solutions, the reactivity order of the halogens can be determined.

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    This document discusses halogen displacement reactions to determine the reactivity trend of the halogens (F, Cl, Br, I). When a more reactive halogen is mixed with a salt solution containing a less reactive halogen, the more reactive halogen will displace the other from the salt, causing a color change that indicates a reaction occurred. By observing which halogen causes color changes in different salt solutions, the reactivity order of the halogens can be determined.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    94 views2 pages

    Halogen Displacement Reactions

    Uploaded by

    Aneta Katsarova
    This document discusses halogen displacement reactions to determine the reactivity trend of the halogens (F, Cl, Br, I). When a more reactive halogen is mixed with a salt solution containing a less reactive halogen, the more reactive halogen will displace the other from the salt, causing a color change that indicates a reaction occurred. By observing which halogen causes color changes in different salt solutions, the reactivity order of the halogens can be determined.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Halogen Displacement Reactions

    A trend is a general direction in which a set of data changes. For example, if you measure the height of trees
    in a forest every year you are likely to find that they are taller each year. The trend is that the height of the
    trees increases with time.

    There are trends in properties of the elements in the same group of the periodic table. One trend that can
    change as you move down a group is reactivity. Reactivity is a measure of how easily a substance reacts
    with another substance.

    The reactivity of the halogens can be shown by looking at displacement reactions. In these reactions, a
    more reactive halogen can displace a less reactive halogen from a compound.

    A + B C B A + C

    In this example, element A is more reactive than element C, so it displaces element C from the compound.
    This forms a new compound made of elements A and B.

    In the halogen displacement reactions, the substances formed after the reaction are a different colour. This
    means that if we see a colour change, we know that a reaction must have occurred.

    In the reactions below:

    • The salt solutions are colourless.


    • Chlorine solution is pale green.
    • Bromine solution is orange.
    • Iodine solution is brown.

    If we mix a colourless salt solution with pale green chlorine, we expect the colour to be pale green. If it
    forms a different colour, then we know a reaction has occurred.

    colour after chlorine colour after bromine colour after iodine


    salt solution
    solution added solution added solution added

    potassium chloride pale green orange brown

    potassium bromide orange orange brown

    potassium iodide brown brown brown

    1. Tick the box next to the three reactions where there has been a colour change.

    1 of 2
    Halogen Displacement Reactions

    To order the halogens based on their reactivity, we need to work out which halogen has been displaced.

    We know the salt solutions are colourless. These are shown in the boxes below.

    colourless colourless

    A + B C B A + C

    If a reaction does not occur, then the If a reaction does occur, then the
    colour remains the colour of element A. colour changes to the colour of
    This is the halogen that was added in element C. This is the halogen that
    the halogen solution (chlorine solution, has been displaced from the salt
    bromine solution or iodine solution). solution.

    If we see a colour change, we know that element A is more reactive than element C. This means that the
    halogen in the halogen solution is more reactive than the halogen in the salt solution.

    2. For each of the reactions you circled in the table above, say which halogen was displaced, and which
    halogen was the more reactive one.

    more reactive halogen

    displaced halogen

    more reactive halogen

    displaced halogen

    more reactive halogen

    displaced halogen

    3. Explain which of the halogens was the most reactive and which was the least reactive. You should use
    the results to say how you know.

    2 of 2

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