Group 7 Reactioms

Question 1

What is the common name for Group 7 elements in the periodic table?

Answer 1

Halogens

Question 2

How many valence electrons do Group 7 elements have?

Answer 2

7

Question 3

What color do halogens often appear as in their elemental form?

Answer 3

Diatomic molecules with different colors (e.g. F₂ is pale yellow, Cl₂ is greenish-yellow)

Question 4

Which halogen has the highest electronegativity?

Answer 4

Fluorine

Question 5

What is the trend in reactivity of halogens within Group 7?

Answer 5

Reactivity decreases down the group

Question 6

Which halogen is a liquid at room temperature?

Answer 6

Bromine

Question 7

What is the general equation for the reaction between a halogen and an alkali metal?

Answer 7

2X(s) + 2M(s) -> 2MX(s) (where X is the halogen and M is the alkali metal)

Question 8

In a displacement reaction between halogens, which halogen will displace the other from a solution of its salt?

Answer 8

The more reactive halogen will displace the less reactive halogen

Question 9

What is the test for halide ions using silver nitrate solution?

Answer 9

Formation of a precipitate (AgX) where X is the halide ion

Question 10

What color precipitate is formed when chlorine is added to a silver nitrate solution?

Answer 10

White

Question 11

What is the general equation for the reaction between a halogen and water?

Answer 11

X₂ + H₂O -> 2HX + HOX (where X is the halogen)

Question 12

Which halogen is the strongest oxidizing agent?

Answer 12

Fluorine

Question 13

What is the general equation for the reaction between a halogen and a metal hydroxide?

Answer 13

X₂ + 2OH⁻ -> 2HX + OX²⁻ (where X is the halogen)

Question 14

What is the trend in boiling points of halogens within Group 7?

Answer 14

Boiling points increase down the group

Question 15

What is the general equation for the reaction between a halogen and a metal chloride?

Answer 15

X₂ + 2MCl -> 2MX + Cl₂ (where X is the halogen and M is the metal)

Question 16

What product is formed when chlorine reacts with cold, dilute NaOH?

Answer 16

Sodium chlorate(I) and sodium chloride are formed

Question 17

What is the general equation for the reaction between a halogen and ammonia?

Answer 17

3X₂ + 6NH₃ -> 6HX + N₂ (where X is the halogen)

Question 18

What is the trend in melting points of halogens within Group 7?

Answer 18

Melting points increase down the group

Question 19

Which halogen has the lowest boiling point?

Answer 19

Iodine

Question 20

What product is formed when bromine water is added to an alkene?

Answer 20

A colorless compound is formed

Question 21

What is the general equation for the reaction between a halogen and a metal sulfate?

Answer 21

X₂ + MSO₄ -> MX₂ + SO₂ + OX₂ (where X is the halogen and M is the metal)

Question 22

What happens to the reactivity of halogens as you move down Group 7?

Answer 22

Reactivity decreases

Question 23

What product is formed when iodine reacts with hot, concentrated NaOH?

Answer 23

Sodium iodide, sodium iodate(V), and water are formed

Question 24

Which halogen has the highest melting point?

Answer 24

Iodine

Question 25

What is the trend in atomic radii of halogens within Group 7?

Answer 25

Atomic radii increase down the group