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Group I Alkali Metals Group VII Halogens

Group I Alkali Metals Group VII Halogens. Section Review P161 Q1, 2, 4 P164 Q1, 3, 4. Group I Alkali Metals. Why are the Group I metals called alkali metals? They are called alkali metals because they react with water to give alkaline solutions. Group I Alkali Metals.

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Group I Alkali Metals Group VII Halogens

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  1. Group I Alkali MetalsGroup VII Halogens Section Review P161 Q1, 2, 4 P164 Q1, 3, 4

  2. Group I Alkali Metals • Why are the Group I metals called alkali metals? They are called alkali metals because they react with water to give alkaline solutions.

  3. Group I Alkali Metals 2. (a) Why are the Group I elements similar? They are similar because all the elements in Group I have one outer shell electron.

  4. Group I Alkali Metals 2. (b) List some of the similarities in the properties of the metals. • Shiny, silvery solids • Soft and can be easily cut with a knife • Low densities (increase down the group) and low melting points (decrease down the group)

  5. Group I Alkali Metals 2. (b) List some of the similarities in the properties of the metals. • Tarnish easily in air- kept under oil to prevent contact with air • React with water to give alkaline solutions • Form ionic compounds, containing ions with +1 charge

  6. Group I Alkali Metals 4. Rubidium is below potassium in Group I. • How many outer shell electrons do atoms of rubidium have? One • Predict • Its state (at room temperature) Solid • Its appearance Shiny • Its hardness Soft

  7. Group I Alkali Metals 4. (c)(i)Compared with potassium, how vigorous would you expect rubidium to react with water? Rubidium will react more vigorously with water.

  8. Group I Alkali Metals 4. (c)(ii) Write an equation, with state symbols, for the reaction. 2Rb(s) + 2H2O(l)  2RbOH(aq) + H2(g) (c)(iii) A solution is produced in the reaction. Suggest one property of this solution. It is alkaline and turns red litmus blue.

  9. Group VII Halogens • (a) Why are the halogens similar? They are similar because all the elements in Group VII have seven outer shell electron.

  10. Group VII Halogens • (b) List some of the similarities in the properties of the halogens. • Diatomic molecules- Each molecule contains two atoms. • Low melting points and boiling points (increase down the group) • Form ion with -1 charge • Forms ionic compounds with Group I elements and have similar formulae (e.g. NaCl, NaBr, NaI)

  11. Group VII Halogens • (b) List some of the similarities in the properties of the halogens. • React vigorously with metals to form ionic salts • A more reactive halogen will displace a less reactive halogen from an aqueous solution of its ions.

  12. Group VII Halogens 3. Bromine displaces iodine from aqueous sodium iodide solution. (a) A more reactive halogen (e.g. bromine) displaces a less reactive halogen from an aqueous solution of its ions (e.g. iodide ions from sodium iodide).

  13. Group VII Halogens 3. (b) Write the chemical equation with state symbols for this reaction. The chemical equation is Br2 (aq)+ 2NaI (aq)  2NaBr(aq) + I2(aq)

  14. Group VII Halogens 4. Bromine does not react with aqueous sodium chloride solution. Explain. It is because bromine is less reactive than chlorine. Therefore, bromine is not able to displace chlorine from the aqueous sodium chloride solution.

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