GCSE OCR Gateway Chemistry: Combined Science 4.1 Reactivity of Metals: A teacher demonstrates the react

Question

A teacher demonstrates the reactions of the Group 1 metals with water.

Element
Observations with cold water
Formulae of products

Lithium
Fizzes and moves slowly across the surface of the water.
LiOH(aq)
H2(g)

Sodium
Fizzes, melts into a silvery ball and moves quickly across the surface of the water.
NaOH(aq)
H2(g)

Potassium
Fizzes, melts into a silvery ball and moves very quickly across the surface of the water.
KOH(aq)
H2(g)

Rubidium
Explodes with a white flame.

When potassium is added to cold water it melts and moves very quickly across the surface of the water.
Write down one other observation when potassium is added to cold water.

(b) Complete Table 13.1 for rubidium.

(c) Explain, in terms of electron loss or gain, the difference between lithium and sodium when they react with cold water.

(d) Table 13.2 shows the density of the Group 1 metals from lithium to caesium.

Which Group 1 metal does not fit the general trend?

Explain your answer using information from Table 13.2.

A teacher demonstrates the reactions of the Group 1 metals with water - OCR Gateway - GCSE Chemistry: Combined Science - Question 13 - 2021 - Paper 10

Worked Solution & Example Answer:A teacher demonstrates the reactions of the Group 1 metals with water - OCR Gateway - GCSE Chemistry: Combined Science - Question 13 - 2021 - Paper 10

Write down one other observation when potassium is added to cold water.

Complete Table 13.1 for rubidium.

Explain, in terms of electron loss or gain, the difference between lithium and sodium when they react with cold water.

Which Group 1 metal does not fit the general trend?

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