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Questions and Answers
What is the physical state of fluorine at room temperature?
What is the physical state of fluorine at room temperature?
Which halogen has the highest melting point?
Which halogen has the highest melting point?
Which statement correctly describes the trend in boiling points of the halogens as you descend the group?
Which statement correctly describes the trend in boiling points of the halogens as you descend the group?
What color is bromine in its liquid state at room temperature?
What color is bromine in its liquid state at room temperature?
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What type of intermolecular forces exist between halogen molecules?
What type of intermolecular forces exist between halogen molecules?
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Which halogen is least effective as an oxidizing agent?
Which halogen is least effective as an oxidizing agent?
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Which statement about the color of iodine vapour is correct?
Which statement about the color of iodine vapour is correct?
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What happens to the strength of van der Waals forces as the relative formula mass of halogen molecules increases?
What happens to the strength of van der Waals forces as the relative formula mass of halogen molecules increases?
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Study Notes
Group VII - The Halogens
- The halogens are reactive non-metals, similar in character but with gradual changes as the group descends.
- They exist as diatomic molecules (e.g., F₂, Cl₂, Br₂, I₂).
- Intermolecular forces are weak van der Waals forces.
- The strength of these forces increases with increasing molecular size/mass.
- Melting and boiling points increase down the group due to stronger van der Waals forces with larger molecules.
Physical Properties of Halogens
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Fluorine (F₂): Yellow gas at room temperature.
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Chlorine (Cl₂): Green-yellow gas at room temperature.
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Bromine (Br₂): Red-brown liquid at room temperature, red-brown vapour.
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Iodine (I₂): Grey-black crystals at room temperature, violet vapour (sublimes).
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Intermolecular Forces: van der Waals forces (when liquefied)
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Melting Points (°C): Fluorine (-220), Chlorine (-101), Bromine (-7), Iodine (114)
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Boiling Points (°C): Fluorine (-188), Chlorine (-35), Bromine (59), Iodine (184)
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Description
Explore the fascinating properties of the Halogens in Group VII. This quiz covers their physical characteristics, molecular forms, and the trend of melting and boiling points. Test your knowledge on these reactive non-metals and their intermolecular forces.
