Group 7,1,0 And Transition Metals

Question 1

What are halogens

Answer 1

Elements in group 7 which are halogens and are diatomic molecules(2 atoms joined togethet)

Question 2

Why do the elements in group 7 go down in reactivity as you go down the group and why do the melting and boiling point increase

Answer 2

As you go down the elements the outer shell gets further and further away from the positive nucleus the attractive force needed to pull the extra electron gets weaker

Question 3

What does displacement reaction mean

Answer 3

When a more reactive element pushes out a less reactive element

Question 4

What are each of the elements in group 7

Answer 4

Flourine-poisonous yellow gas
Chlorine- poisonous green gas
Bromine- redy brown volitle liquid piionsous
Iodine -dark grey solid which can form poisionous purple vapours

Question 5

Why are alkali metals different from normal metals

Answer 5

They are very reactive
Soft
Low melting point

Question 6

Why do alkali metals increase in reactivity as u go down the group

Answer 6

As you go down atomic radius gets biggrr so outer shell gets further away from positive nucleus increased distance weakens the attraction between electrons and positive nucleus so the electron can be lost more easy increasing reactivity

Question 7

Why do elements in group 1 become 1+ion

Answer 7

1 electron in outer shell and needs to loose that one to become stable

Question 8

What happenes to each of the group 1 elements when you place it in water

Question 9

What happenes when group 1 elements r are placed in water

Answer 9

Lithium- .floats in water .effeevesces .hydrogen gas is produced . Dissapears

Sodium- .floats on surface. . Effervesces . .hydrogen gas is produced. .dissapears. .moltenball made which moves quickly on water surface. .sometimes hydrogen catches fire with yellow flame

Potassium
Molten ball moves quiclly
Hydrogen catxhes fire to produce lilac flame

Question 10

Why does potassium onwards in group 1 produce a flame

Answer 10

Soo much energy is released from the exothermic reaction that it lights the hydrogen gas that also gets released from the reaction

Question 11

When sodium is added to water what happens

Answer 11

Forms molten ball which floats on surface of water

Question 12

Why does sodium form a molten ball when added to water

Answer 12

Because of its low density and low boiling point

Question 13

Write a balanced equation for the reaction of sodium with water

Answer 13

Sodium + water -> metal hydroxide + hydrogen

2Na + 2H²O-> 2NaOH+H²

Question 14

Why is argon used is filiments lamps

Answer 14

Because its inert

Question 15

Why in terms of their structures are metals malleable

Answer 15

Posistive metal ions are in layers and can slide over eachother

Question 16

A small piece of potassium is added to waterwhat will u see

Answer 16

Burns
Small spark
Lilac flame
Lets off hydrogen gas

Question 17

How do u balance an equation

Answer 17

Check how many of that element is there on each side
Balance it by only adding more big numbers

Question 18

Explain how metals conduct electricity

Answer 18

The delocalised electrons move freely so they can conduct electricity

Question 19

Decribe metals in terms of their particles present in their structures

Answer 19

Posistive metal ions in a sea of delocalised electrons

Question 20

trends with the physical and chemical properties of group 1 metals

Answer 20

go down the group more reactive
as u go down the group the melting and boiling point decreases

Question 21

lithium+oxygen

Answer 21

LiO²