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21 Cards in this Set

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Group 7 metals physical properties (3)

- Low melting and boiling points


- Exist as diatomic molecules


- Boiling pt increases as you go down the group

Describe the reactivity of Group 7 metals

- Reactivity decreases as you go down the group


- Atomic radii increases


- Shielding increases


- The attraction between the nucleus and the outer electrons decreases


- Ability to gain an electron decreases to form a halide ion.

Why does the boiling point increase as you go down the group?

- The number of electrons increases


- The number of van der Waal's forces increases


- Hence, more energy is required to break the bonds as you go down the group.

What is a Displacement Reaction?

A reaction in which the more reactive element displaces the less reactive element and forms an aqueous solution with the latter's ions.

Colour of Chlorine in Water and Cyclohexane

Pale - green (in both)

Colour of Bromine in Water and Cyclohexane

Orange (in both)

Colour of Iodine in Water and Cyclohexane

- Water: Brown


- Cyclohexane: Purple

What is a Disproportionation reaction?

The oxidation and reduction of the same element in a redox reaction.

Advantage of Chlorine

Effective bacteria killer

Disadvantage of Chlorine

Toxic

What is the symbol equation of how Chloric (I) Acid is made?

Cl2 + H2O ----------> HClO + HCl

What is NaClO

Sodium (I) Chlorate- Household Bleach

Give the equation for Bleach

Cl2 + 2NaOH --------> NaCl + NaClO + H2O

Give the equation for hot concentrated bleach

3Cl2 + 6NaOH -------> 5NaCl + NaClO3 + 3H20

What is a precipitation reaction?

Formation of a solid during a chemical reaction.

Cl- ions in AgNO3

White precipitate

Br- ions in AgNO3

Cream precipitate

I- ions in AgNO3

Yellow precipitate

What do Cl- ions dissolve in?

Dilute NH3 solution

What do Br- ions dissolve in?

Concentrated NH3 solution

What do I- ions dissolve in?

Insoluble in both dilute and concentrated NH3 solution