OCR Chemistry A - 'The Halogens' 3.1.3

How do the halogens exist in their standard state?

• as monoatomic molecules

• as diatomic molecules

• as a giant covalent lattice

From fluorine to iodine, the boiling points of the halogens

• decrease down the group BECAUSE fluorine is the most reactive halogen

• decrease down the group BECAUSE fluorine is the most electronegative halogen

• increase down the group BECAUSE iodine has the most electrons

• increases down the group BECAUSE iodine has the largest atomic radius

What is the electronic configuration of Chlorine? Written in the form 1s2 2s2 2...

How many electrons does a halogen have in its outer shell and what charge ion does it form?

• 2, +2

• 6, -2

• 7, -1

• 1, +1

What intermolecular forces are present for halogen molecules?

• permanent dipole-dipole

• hydrogen bonding

• induced dipole-dipole

• ionic

In a halogen-halide displacement reaction ________ can replace ____________. Tick all that apply

• iodine, bromide

• bromine, iodide

• bromine, chloride

• chlorine, bromide

• chlorine, iodide

Down the group reactivity of the halogens __________?

In a redox reaction is chlorine, Cl₂, oxidised or reduced?

When Cl₂(aq) reacts with iodide ions (aq) what is observed?

• colour change to pale green from Cl₂ (aq) formation

• no change observed

• colour change to orange from Br₂ (aq) formation

• colour change to violet from I₂ (aq) formation

Fill in the blanks:

In the halogens, going down the group, atomic radius _________. More inner shells causes shielding to __________. ____ nuclear attraction to capture an electron from another species. Reactivity ___________.

• decreases, decrease, more, increases

• increases, decrease, less, increases

• increases, increase, less, decreases

• decreases, increase, more, decreases