The Group 7 Elements Flashcards Preview

Chemistry Module 4 > The Group 7 Elements > Flashcards

Flashcards in The Group 7 Elements Deck (14):
1

What are the group 7 elements?

Fluorine
Chlorine
Bromine
Iodine

2

Describe the uses of some Group 7 elements

- chlorine is used to sterilise water
- chlorine is used to make pesticides and plastics
- iodine is used to sterilise wounds

3

How do group 7 elements react with group 1 elements?

Vigorously

4

What happens to the reactivity of the group 7 elements?

The reactivity decreases as you go down the group

5

Describe the physical appearance of the group 7 elements at room temperature

- chlorine is a green gas
- bromine is an orange liquid
- iodine is a grey solid

6

Predict the properties of fluorine or astatine given the properties of the other group 7 elements. E.g.
- physical properties
- melting point
- boiling point
- displacement reactions

- high boiling point
- high melting point
- least reactive so can't displace any of the other halogens from an aqueous solution of their metal halides
- has a density of about 7cm3

7

When does the metal halide form?

When a group 1 element reacts with a group 7 element

8

Describe the displacement reactions of group 7 elements with solutions of metal halides

- chlorine displaces bromides and iodides
- bromine displaces iodides

9

Explain why group 7 elements have similar properties, in terms of forming negative ions with stable economic structures

Because when the halogens react an atom gains one electron to form a negative ion with a stable electronic structure

10

Construct an equation to show the formation of a halide ion from a halogen molecule

F₂ 2e⁻ → 2F⁻
Cl₂ 2e⁻ →2Cl⁻

11

What is reduction?

The gain of electrons

12

Explain why a process is reduction from its ionic equation

By looking at its equation, if electrons are added then it's a reduction reaction

13

Explain in terms of electron gain the trend in reactivity of the group 7 elements

The halogens have similar properties because when they react, an atom gains one electron to form a negative ion with a stable electronic structure

14

What are the group 7 elements known as?

The halogens