Reactivity Trends (OCR A-Level Chemistry A): Quizzes

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Qualitative Analysis
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What is qualitative analysis used for in chemistry?

Identifying substances using observations

What observation confirms the presence of CO32−\text{CO}_3^{2-} ions when dilute HNO3\text{HNO}_3 is added?

Bubbles of gas appear (effervescence)

What happens to lime water when CO2\text{CO}_2 gas is bubbled through it?

It turns cloudy or milky white

What is the colour of the precipitate formed in a positive sulfate test?

White

What colour is the precipitate of silver iodide (AgI\text{AgI}) in the halide test?

Yellow

Which silver halide dissolves in dilute ammonia?

AgCl\text{AgCl} only

What is the correct order for testing anions in an unknown sample?

Carbonate, then sulfate, then halide

Why must carbonate be tested before sulfate?

BaCO3\text{BaCO}_3 is white and would give false positive

How is ammonia gas identified in the ammonium ion test?

Moist pH paper turns blue

Why use Ba(NO3)2\text{Ba(NO}_3)_2 not BaCl2\text{BaCl}_2 when testing mixtures for sulfate then halide?

BaCl2\text{BaCl}_2 adds Cl−\text{Cl}^- ions causing false positive

Explore OCR A-Level Chemistry A Revision Notes by Topics

Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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