8.2 Group I Properties (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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- FrontGroup I Properties
Why are Group I metals called alkali metals?
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Why are Group I metals called alkali metals?
Group I metals are called alkali metals because they react with water to produce an alkaline metal hydroxide solution and hydrogen gas. All Group I atoms have one electron in their outer shell.
When a Group I metal reacts with water, the products are a metal ______ solution and ______ gas.
When a Group I metal reacts with water, the products are a metal hydroxide solution and hydrogen gas.
Why are Group I metals stored under oil?
Group I metals are stored under oil to prevent them reacting with oxygen and water vapour in the air. They are reactive enough to oxidise and react with moisture at room temperature.
As you go down Group I, the melting point ______, the density ______ and the reactivity ______.
As you go down Group I, the melting point decreases, the density increases and the reactivity increases.
True or False?
"A gas is produced" is an acceptable observation when describing potassium reacting with cold water.
False.
This is a conclusion, not an observation. Acceptable observations include writing that the metal fizzes or bubbles are seen.
When potassium is added to cold water, it floats and ______, gets smaller to form a ______ solution and burns with a ______ flame.
When potassium is added to cold water, it floats and fizzes, gets smaller to form a colourless solution and burns with a lilac flame.
Given that potassium reacts vigorously with cold water, predict how rubidium would react.
Rubidium is below potassium in Group I, so it would react more vigorously with cold water. It would produce rubidium hydroxide and hydrogen gas.
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