Flashcards
Group 2 - The Alkaline Earth Metals
Flashcards do conjunto (18)
- 1Describe the trend in reactivity down Group 2Because ionisation energy decreases down the group, reactivity increases down the group
- 2When Group 2 elements react, they are oxidised from an oxidation state of...0 to +2
M --> M²⁺ + 2e⁻ - 3Give the general symbol equation for the reaction between Group 2 metals and waterM + 2H₂O --> M(OH)₂ + H₂
Where 'M' is the metal - 4When Group 2 metals react with water, a metal hydroxide is formed. What happens when the metal hydroxide dissolves in water?The metal hydroxide that forms dissolves in water to produce hydroxide ions (OH⁻). These make the solutions strongly alkaline (with a pH of about 12-13)
- 5Describe and explain the reactivity of Group 2 metals with waterThe elements react more readily down the group because the ionisation energies decrease. This is due to the increasing size of the atomic radii and the increasing shielding effect.
- 6What is the product formed when Group 2 metals burn in oxygen?Solid white oxides
- 7Give the general symbol equation for the reaction between Group 2 metals and oxygen2M + O₂ --> 2MO
Where 'M' is the metal - 8When Group 2 metals react with oxygen, a metal oxide is formed. What happens when the metal oxide reacts with water?The oxides of Group 2 metals react readily with water to form metal hydroxides, which dissolve. The OH⁻ ions make these solutions strongly alkaline
- 9Describe and explain the reactivity of Group 2 metals with oxygenThe oxides form more strongly alkaline solutions as you go down the group, because the hydroxides get more soluble
- 10TRUE OR FALSE: Magnesium oxide reacts very slowly with waterTRUE
Magnesium oxide only reacts slowly and the hydroxide isn't very soluble - 11What are the products formed when Group 2 metals react with dilute hydrochloric acid?Metal chloride
Hydrogen - 12Give the general symbol equation for the reaction between Group 2 metals and dilute hydrochloric acidM + 2HCl --> MCl₂ + H₂
Where 'M' is the metal - 13The reactions between Group 2 metals and different dilute acids produce different salts. Give the general symbol equation for the reaction between Group 2 metals and dilute sulfuric acidM + 2H₂SO₄ --> MSO₄ + H₂
Where 'M' is the metal - 14Complete the sentences: Group 2 elements are known as the __________ ________ metals. Many of their common compounds are used for _______________ acids.Group 2 elements are known as the ALKALINE EARTH metals. Many of their common compounds are used for NEUTRALISING acids.
- 15What is the use of calcium hydroxide?Calcium hydroxide (slaked lime, Ca(OH)₂) is used in agriculture to neutralise acidic soils
- 16Calcium hydroxide must be used in moderation. Why?It has to be used in moderation otherwise the soils will become too alkaline to support crop growth
- 17What is the use of magnesium hydroxide and calcium carbonate?They are used in some indigestion tablets as antacids - these neutralise excess stomach acid
- 18Give the ionic equation for neutralisationH⁺ + OH⁻ --> H₂O
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- O usuário eliminou as informações de disciplina FlashCards sobre Group 2 - The Alkaline Earth Metals, criado por Usuário eliminado em 05-03-2018.
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- Usuário eliminado · mar 2018
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- 5 mar 2018
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- Criado por Yinka F · 3 mar 2018
- Copiado por Yinka F · 5 mar 2018
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