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Why does barium react more rapidly with cold water than magnesium does? A - CIE - A-Level Chemistry - Question 14 - 2017 - Paper 1

Question 14

Why does barium react more rapidly with cold water than magnesium does? A. Barium atoms are larger and form ions more easily than magnesium atoms. B. Barium floats... show full transcript

Worked Solution & Example Answer:Why does barium react more rapidly with cold water than magnesium does? A - CIE - A-Level Chemistry - Question 14 - 2017 - Paper 1

Step 1

A. Barium atoms are larger and form ions more easily than magnesium atoms.

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Answer

Barium, being in Group 2 of the periodic table, has larger atomic size and lower ionisation energy compared to magnesium. This allows barium to lose its outer electron more readily, enhancing its reactivity with cold water.

Step 2

B. Barium floats on the surface of the water but magnesium sinks in the water.

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Answer

While barium does float on water, this is not the key reason for its reactivity. The primary factor lies in the tendency of barium to form ions more easily.

Step 3

C. Barium hydroxide is less soluble than magnesium hydroxide.

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Answer

This statement does not accurately reflect the reactivity of barium with water. In fact, barium hydroxide is more soluble in water than magnesium hydroxide.

Step 4

D. The sum of the 1st and 2nd ionisation energies of barium is more than that for magnesium.

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Answer

This statement is incorrect; barium has lower ionisation energies, which contributes to its higher reactivity with water.

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Questions answered

Why does barium react more rapidly with cold water than magnesium does? A - CIE - A-Level Chemistry - Question 14 - 2017 - Paper 1

Worked Solution & Example Answer:Why does barium react more rapidly with cold water than magnesium does? A - CIE - A-Level Chemistry - Question 14 - 2017 - Paper 1

A. Barium atoms are larger and form ions more easily than magnesium atoms.

B. Barium floats on the surface of the water but magnesium sinks in the water.

C. Barium hydroxide is less soluble than magnesium hydroxide.

D. The sum of the 1st and 2nd ionisation energies of barium is more than that for magnesium.

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