C8 Reactivity Trends Flashcards

1
Q

What’s the common name given to group 2 metals

A

Alkaline earth metals

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2
Q

What’s the most reactive metal of group 2

A

Barium

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3
Q

List 3 physical properties of group 2 metals

A

High melting and boiling points

Low density metals

Form colourless (white) compounds

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4
Q

The highest energy electrons of group 2 metals are in which subshell

A

S subshell

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5
Q

Does reactivity increase or decrease down group 2? Why

A

Increases

Electrons are lost more easily because larger atomic radius and more shielding

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6
Q

What happens to the first ionisation energy as you go down group 2 and why

A

Decreases

Increased shielding

Increased atomic radius -> weaker force between outer

Electron and nucleus —> less energy needed to remove electron

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7
Q

What type of reaction is the reaction between group 2 elements and oxygen

A

Redox reaction

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8
Q

Write an equation for the reaction of calcium and oxygen

A

2Ca(s) + O2(g) —> 2CaO(S)

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9
Q

What are the products when group 2 elements react with water

A

Hydroxide and hydrogen gas

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10
Q

Which group 2 element doesn’t react with water

A

Beryllium

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11
Q

Which group 2 element reacts very slowly with water

A

Magnesium

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12
Q

what type of reaction is the reaction between group 2 metal and water

A

Redox reaction

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13
Q

Write an equation for the reaction of barium and water

A

Ba(s) + 2H2O(l) —> Ba(OH)2 (aq) + H2(g)

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14
Q

What’s oxidised and what’s reduced in a reaction between group 2 metal and water

A

Metal —> oxidised

One hydrogen atom from each water —> reduced

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15
Q

What are the products when a group 2 element reacts with an dilute acid

A

Salt and hydrogen gas

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16
Q

Write an equation for the reaction of calcium and HCl

A

Ca(s) + 2HCl(aq) —> CaCl2(s) + H2(g)

17
Q

What’s the formed when group 2 oxides react with water

A

Metal hydroxide

18
Q

Write an equation for the reaction between a group 2 oxide and water

A

MO(s) + H2O(l) —>M(OH)2(aq)

19
Q

What group 2 metal oxide is insoluble in water

A

Beryllium oxide

20
Q

What is the trend in hydroxide solubility down group 2

A

Increases down group

Mg(OH)2 is slightly soluble

Ba(OH)2 creates a strong alkaline solution

21
Q

What’s Ca(OH)2 used for? Write an equation related one of its uses

A

Used to neutralise soil

Ca(OH)2(aq) + 2HCl(aq) —> 2H2O(l) + CaCl2(aq)

22
Q

What’s Mg(OH)2 used for

A

Milk of magnesia - antacid to treat indigestion, heartburn, etc.

23
Q

What’s calcium carbonate used for

A

Present in limestone and marble

Used in building construction

24
Q

What’s the drawback of using calcium carbonate construction? Write a related equation

A

Group 2 carbonates react with acid

CaCO3(s) + 2HCl(aq) —> CaCl2(aq) + H2O(l) + CO2(g)

25
Q

What’s the drawback of using calcium carbonate construction? Write a related equation

A

Group 2 carbonates react with acid

CaCO3(s) + 2HCl(aq) —> CaCl2(aq) + H2O(l) + CO2(g)