Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry 2 > 2.2 - reactions of alkali metals And Halogens > Flashcards

2.2 - reactions of alkali metals And Halogens Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

Alkali metal + halogen =

A

Metal halide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the equations for alkali metals reacting with halogens

A

2Li+ Cl2 = 2LiCl
2Na + Cl2 = 2NaCl
2K + Cl2 = 2NaCl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Equations for alkali metals reacting with water

A

2Li + H2O = H2 + 2LiOH
2Na + 2H20 = H2 + 2NaOH
2K + 2H20 = H2 + 2KOH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What can be observed when lithium reacts with water?

A

It floats, fizzes and moves slowly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What can be observed when sodium reacts with water?

A

It floats, fizzes, melts into a ball and moves quickly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What can be observed when potassium reacts with water?

A

It floats, fizzes, moves very quickly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Why does the reactivity of alkali metals increase going down the group?

A
  • the atoms of each element get larger going down the group
  • this means that the outer shell electron gets further away from the nucleus
  • the further an electron is from the nucleus, the easier it is for it to be lost in reactions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What colour is lithium in a flame?

A

Red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What colour is Potassium in a flame?

A

Lilac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What colour is sodium in a flame?

A

Yellow/red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does chlorine look like?

A

A pale green gad

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does bromine look like?

A

An orange/brown liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does iodine look like?

A

A grey/black solid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why does the reactivity of the halogens decrease going down the group?

A
  • the atoms of elements get larger going down the group
  • the outer shell gets further away from the nucleus and is shielded by more electron shells
  • the further the outer shell is from the nucleus, the harder it is for another electron to be attracted to complete the outer shell
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the equation for potassium bromide + chlorine ?

A

2KBr + Cl2 = 2Kcl + Br2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the equation for potassium Iodide and Chlorine?

A

2KI + Cl2 = 2Kcl + I2

17
Q

What is the equation for potassium iodide and bromine?

A

2Kl + Br2 = 2KBr+ I2

18
Q

How do you identify a halide solution?

A
  • dissolve a small amount of halide ion in nitric acid
  • add 3 to 5 drops of silver nitrate solution
  • record the colour of the precipitate
19
Q

Halide precipitation colours

A 
Chloride = white
Bromide = cream
Iodide = yellow
20
Q

What are the equations for the alkali metals + oxygen?

A

4LI + O2 = 2Li2O
4Na + O2 = 2Na2O
4K + O2 = 2K20

Chemistry 2 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions