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    Halogens Worksheet

    Uploaded by

    Thị Thu Trang Nguyễn

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Halogens Worksheet

    Uploaded by

    Thị Thu Trang Nguyễn
    50 views4 pages

    Original Title

    Halogens worksheet

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    Copyright:

    © All Rights Reserved
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    50 views4 pages

    Halogens Worksheet

    Uploaded by

    Thị Thu Trang Nguyễn

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    Halogens activity sheet

    Teaching notes
    This activity sheet can be used with the set of halogen fact cards or other suitable sources, e.g.
    text books or websites such as www.webelements.com and http://www.rsc.org/periodic-table .
    Students could be asked research and create their own fact cards before being given the activity
    sheet.

    Students will need to have been taught atomic structure (for questions 1 and 10). Question 10
    provides more challenge and an opportunity to review electron configurations.

    It encourages students of a wide range of abilities to spot patterns in the group and make
    predictions.

    Answers

    1. F, Cl, Br, I

    2. more

    3. increases

    4. As you go down the group, the boiling point increases.

    5. The colour changes and gets darker: yellow, green, brown, purple.

    6. Drawing to show colour change: iron turns red brown as iron iodide forms.

    7. a) sodium iodide

    b) estimate between -1010C (Cl melting point) and 59 0C (Br boiling point) (actual Cl
    boiling point is -34 0C)

    c) estimate between -101 0C (Cl melting point) and 59 0C (Br boiling point) (actual Br
    melting point is -7 0C)

    d) aluminium iodide

    8. chlorine + calcium  calcium chloride

    9. bromine + iron  iron bromide

    10. As atomic number increases, reactivity decreases.

    © www.teachitscience.co.uk 2013 20045 Page 1 of 4


    Halogens activity sheet

    Task

    1. On your desk, arrange the fact cards in order of proton number, starting with the lowest at
    the top.

    2. Circle the correct underlined word:


    As you go down group 7, the metals get more/less reactive.

    3. Circle the correct underlined word:


    As you go down group 7, the melting point increases/decreases.

    4. Complete the sentence:


    As you go down the group, the boiling point __________________________________

    5. What happens to the elements’ colours as you go down group 7?

    ____________________________________________________________________

    ____________________________________________________________________

    ____________________________________________________________________

    6. Draw a picture to show what you think would happen when the element after iodine is added
    to heated iron wool.

    © www.teachitscience.co.uk 2013 20045 Page 2 of 4


    Halogens activity sheet

    7. There is information missing from the fact cards. Predict:

    a. the compound made when sodium reacts with iodine

    ________________________________________________________________

    b. the approximate boiling point of chlorine

    ________________________________________________________________

    c. the approximate melting point of bromine

    ________________________________________________________________

    d. the compound made when fluorine reacts with aluminium.

    ________________________________________________________________

    8. Write an equation for the reaction of chlorine with calcium.

    9. Write an equation for the reaction of bromine with iron.

    10. Use your knowledge of atomic structure to explain the pattern in reactivity that you have
    discovered for this group. It may help you if you draw the electron configurations for the
    first two of the elements.

    © www.teachitscience.co.uk 2013 20045 Page 3 of 4


    Halogens activity sheet

    Chlorine Iodine
    35.5 127

    Cl I
    17 53
    Green gas Black shiny solid  Purple gas

    Melting point: -101 0C Melting point: 114 0C

    Boiling point: _______ 0C Boiling point: 1840C

    With heated iron wool: starts to glow With heated iron wool: slowly changes
    brightly colour

    sodium + chlorine  sodium chloride iron + iodine  iron iodide

    Bromine Fluorine
    60 19

    Br F
    35 9
    Brown liquid  Brown gas Pale yellow gas

    Melting point: _______ 0C Melting point: -2200C

    Boiling point: 590C Boiling point: -1880C

    With heated iron wool: glows a dull red With heated iron wool: immediately
    colour bursts into flames

    calcium + bromine  calcium bromide iron + fluorine  iron fluoride

    © www.teachitscience.co.uk 2013 20045 Page 4 of 4

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