Reactivity and Properties of Halogens

The video tutorial by Ms. Cem explores the physical and chemical properties of group 17 elements, known as halogens. It covers their reactivity, color, and state changes from gas to solid as molar mass increases. The tutorial explains that halogens are diatomic and react by gaining an electron to form negative ions. Reactivity decreases down the group due to increased atomic radius and electron shielding. The video also discusses halogens' reactions with group 1 metals to form salts and their displacement reactions, highlighting that more reactive halogens can displace less reactive ones from solutions.

Which of the following is a characteristic of halogens as you move down the group?

• They become less reactive.

• They become more metallic.

• They become colorless.

• They become gases.

What is the state of chlorine at room temperature?

• Plasma

• Gas

• Liquid

• Solid

What type of bond is formed between two chlorine atoms in a chlorine molecule?

• Metallic bond

• Ionic bond

• Covalent bond

• Hydrogen bond

Why does the reactivity of halogens decrease down the group?

• Decrease in atomic radius

• Increase in electron shielding

• Decrease in number of protons

• Increase in nuclear charge

Which halogen is the most reactive?

• Iodine

• Chlorine

• Bromine

• Fluorine

What is formed when sodium reacts with chlorine?

• Sodium fluoride

• Sodium chloride

• Sodium bromide

• Sodium iodide

Which type of bond is formed between sodium and chlorine in sodium chloride?

• Covalent bond

• Ionic bond

• Metallic bond

• Hydrogen bond

Which halogen can displace bromide ions from a solution?

• None of the above

• Chlorine

• Iodine

• Fluorine

Why can't iodine displace bromide ions from a solution?

• Iodine forms a covalent bond with bromine.

• Iodine is less reactive than bromine.

• Iodine is more reactive than bromine.

• Iodine is a gas.

Which halogen can displace all other halide ions from a solution?

• Iodine

• Bromine

• Chlorine

• Fluorine