Group 7 Trends and Displacement Flashcards

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What name is given to the elements in group 7 of the periodic table?

They are called the halogens and they are non-metals.

How does the reactivity of group 7 elements change as you go down the group?

Reactivity decreases as you go down. Chlorine is more reactive than bromine, and bromine is more reactive than iodine.

How do the physical states of chlorine, bromine and iodine change going down group 7 at room temperature?

Chlorine is a gas, bromine is a liquid, and iodine is a solid at room temperature.

What trend in melting and boiling points do group 7 elements show as you go down the group?

Their melting points and boiling points increase as you go down the group.

What is a halide ion?

A halide ion is a negative ion made when a halogen atom gains one electron, for example chloride (Cl⁻), bromide (Br⁻) or iodide (I⁻).

What is meant by a displacement reaction involving halogens?

It is a reaction where a more reactive halogen takes the place of a less reactive halogen from a solution of its halide salt.

Put chlorine, bromine and iodine in order of reactivity, from most reactive to least reactive.

Chlorine (most reactive), then bromine, then iodine (least reactive).

What happens when chlorine is added to potassium bromide solution?

Chlorine displaces bromine to make potassium chloride solution and bromine. The solution turns orange-brown because of the bromine.

What happens when bromine is added to potassium iodide solution?

Bromine displaces iodine to make potassium bromide solution and iodine. The solution turns brown because of the iodine.

Will iodine displace bromine from sodium bromide solution? Explain your answer.

No, iodine will not displace bromine because iodine is less reactive than bromine.

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