Brainscape's Knowledge GenomeTM

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


See full index

Chemistry > 3.2.1: Group 2 > Flashcards

3.2.1: Group 2 Flashcards

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

Why is barium more reactive than calcium ?

A

Barium has more shells (more shielding and larger atomic radius). Barium has a lower nuclear attraction so lower ionisation energy

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

Give 2 observations if a less reactive group 2 metal is used instead of a more reactive one

A

-Less vigorous effervescense
- Solution is less alkaline

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

Give the formula for barium chloride

A

BaCl2

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

What type of reaction is when calcium carbonate is turned into calcium oxide ?

A

Thermal decomposition

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

What are the products when magnesium reacts with ethanoic acid ?

A

CH3COO-Mg+ and H2

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

What are group 2 metals called?

A

Alkali earth metals

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

Which type of orbitals are group 2 metal outer electrons in?

A

S orbitals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Are group 2 metals strong oxidising or reducing agents ?

A

Strong reducing agents

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

What is the trend in reactivity down the group and why?

A

Increases down group as atomic radius increases, MORE shielding, ionisation energy decreases. Nuclear attraction decreases and increased nuclear charge is outweighed by increased shielding.

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

What is the trend in 1st ionisation energies down the group and why ?

A

Decreases as more shielding meaning a weaker attraction between nucleus and outer electrons … CHECK

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

What is the trend in 2nd ionisation energies ?

A

Decreases down group

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

Describe features of the reaction between group 2 metals and oxygen

A
  • Redox
  • Form metal oxides
  • React vigorously
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are features of metal oxides ?

A
  • white solids
  • Bases
  • Neutralised by acids to form salt (soluble except CaCO3) and water
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Give features of the reaction between group 2 metals and water

A
  • Redox
  • Form metal hydroxides (bases) and H2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the trend of the reactivity with water down the group?

A

Reactivity increases as atomic radius increases, shielding increases causing ionisation energy to decrease … CHECK

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

What is the exception to the reaction of group 2 metals with water ?

A

Mg reacts slowly with cold water but vigorously with steam to form MgO

17
Q

Give the features of the reaction between group 2 metals and dilute acids

A
  • Redox
  • Form salt and hydrogen
18
Q

How do you form metal hydroxides from metal oxides

A

Dissolve them in water

19
Q

Give and describe the trend in alkalinity down the group 2 metal hydroxides

A

Alkalinity increases as solubility of resulting solution increases

20
Q

How is Ca(OH)2 useful

A

Neutralises acidic soils

21
Q

How can Mg(OH)2 or CaCO3 be useful

A

As antacids to neutralise excess stomach acid to treat indigestion

H+ + OH- —> H20

22
Q

Give 3 physical properties of group 2 metals

A
  • High mp and bp
  • Low density
  • Form colourless compounds
23
Q

How are group 2 carbonates broken down ?

A

Thermally decomposed to form metal oxides and carbon dioxide

24
Q

What is the trend in decomposition down group 2 ?

A

Becomes more difficult to thermally decompose as compounds are more stable when they form due to reactivity

25
Q

Write the equation for the reaction between barium oxide and water

A

BaO + H20 —-> Ba(OH)2

26
Q

Why would the volume of hydrogen collected be smaller when less pure barium used ?

A

Less barium to react

27
Q

When Ca reacts with HCl why when more Ca is added does it keep reacting ?

A

The Ca reacts with water to produce H2 and Ca(OH)2

28
Q

How can a sample of MgO become contaminated with magnesium carbonate ?

A

MgO has reacted with CO2

29
Q

Why are different volumes of H2 produced when reacting the same mass of Ca and Sr ?

A
  • Different number of moles
  • More moles of Ca
  • More moles of H2 produced
  • Larger volume of H2 produced from Ca
30
Q

Give the general thermal decomposition of carbonates equation

A

CaCO3 —-> CaO + CO2

31
Q

How does CaCO3 combat excess stomach acid ?

A

Neutralises / reacts with HCl
CaCO3 + 2HCl → CaCl2 + H2O + CO2

Chemistry (33 decks)

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