What observations indicate that a displacement reaction has occurred?

  1. Colour change
  2. Precipitate formation

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What is added to the test tubes before the solutions?

5 cm3 of distilled water and 5 drops of universal indicator solution.

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What is a displacement reaction?

A chemical reaction where a more reactive element displaces a less reactive element from its compound.

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Why are displacement reactions used?

To identify reactivity trends of elements.

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What is a reactivity trend?

The pattern of reactivity across a group or period of elements

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Why does reactivity change across a group?

Due to the number of shells and valence electrons changing.

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What is universal indicator used for?

To identify colour changes indicating reactions

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What does a colour change indicate?

A chemical reaction has occurred

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What does precipitate formation indicate?

A chemical reaction has occurred

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What are the expected observations?

More reactive halogens will displace less reactive ones from solutions

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What is the independent variable?

The Group 7 element being added

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What is the dependent variable?

Colour change or precipitate formation

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