This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Step 1: Answer part a). The elements Chlorine (Cl), Bromine (Br), Iodine (I), and Fluorine (F) belong to Group 17 of the periodic table. The family name for Group 17 elements is Halogens. Step 2: Answer part b). Halogen reactivity decreases down the group. Fluorine is the most reactive, and Iodine is the least reactive among the given elements. Order of increasing reactivity (least to most reactive): I, Br, Cl, F Step 3: Answer part c). At room temperature, Fluorine and Chlorine are gases, Bromine is a liquid, and Iodine is a solid. The member of this group that exists as a liquid at room temperature is Bromine (Br). Step 4: Answer part d). i. Define a diatomic molecule. A diatomic molecule is a molecule composed of only two atoms, of the same or different chemical elements. ii. Write down the formula of Fluorine molecule. Fluorine exists as a diatomic molecule. The formula is F_2. iii. Apart from these elements name any other element that exists as a diatomic molecule. Other elements that exist as diatomic molecules include Hydrogen (H_2). Step 5: Answer part e). i. Complete and balance the equation: KBr + Cl₂ → Chlorine is more reactive than bromine, so it displaces bromine from potassium bromide. 2KBr + Cl_2 → 2KCl + Br_2 ii. Complete and balance the equation: NaCl + Br₂ → Bromine is less reactive than chlorine, so it cannot displace chlorine from sodium chloride. NaCl + Br_2 → No reaction Step 6: Answer part f). Chlorine (Cl) is used in the treatment of tap water for disinfection. That's 2 down. 3 left today — send the next one.