Group 7 reactivity trend how to#

Group 7 reactivity trend how to#

1:28 understand how to carry out calculations involving amount of substance, relative atomic mass (Aᵣ) and relative formula mass (Mᵣ).1:27 know that the mole (mol) is the unit for the amount of a substance.1:26 calculate relative formula masses (including relative molecular masses) (Mᵣ) from relative atomic masses (Aᵣ).1:25 write word equations and balanced chemical equations (including state symbols): for reactions studied in this specification and for unfamiliar reactions where suitable information is provided.(e) Chemical formulae, equations and calculations.1:24 understand why the noble gases (Group 0) do not readily react.1:23 Understand why elements in the same group of the Periodic Table have similar chemical properties.

1:22 understand how the electronic configuration of a main group element is related to its position in the Periodic Table.

1:21 identify an element as a metal or a non-metal according to its position in the Periodic Table.

1:20 understand how to use electrical conductivity and the acid-base character of oxides to classify elements as metals or non-metals.

1:19 understand how to deduce the electronic configurations of the first 20 elements from their positions in the Periodic Table.

1:18 understand how elements are arranged in the Periodic Table: in order of atomic number, in groups and periods.

1:17 be able to calculate the relative atomic mass of an element (Aᵣ) from isotopic abundances.

1:16 know what is meant by the terms atomic number, mass number, isotopes and relative atomic mass (Aᵣ).

1:15 know the structure of an atom in terms of the positions, relative masses and relative charges of sub-atomic particles.

1:14 know what is meant by the terms atom and molecule.

1:13 practical: investigate paper chromatography using inks/food colourings.1:12 understand how to use the calculation of Rf values to identify the components of a mixture.

1:11 understand how a chromatogram provides information about the composition of a mixture.1:10 describe these experimental techniques for the separation of mixtures: simple distillation, fractional distillation, filtration, crystallisation, paper chromatography.1:09 understand that a pure substance has a fixed melting and boiling point, but that a mixture may melt or boil over a range of temperatures.1:08 understand how to classify a substance as an element, a compound or a mixture.1:07 (Triple only) practical: investigate the solubility of a solid in water at a specific temperature.1:06 (Triple only) understand how to plot and interpret solubility curves.1:05 (Triple only) know what is meant by the term solubility in the units g per 100g of solvent.1:04 know what is meant by the terms: solvent, solute, solution, saturated solution.1:03 understand how the results of experiments involving the dilution of coloured solutions and diffusion of gases can be explained.1:02 understand the interconversions between the three states of matter in terms of: the names of the interconversions, how they are achieved and the changes in arrangement, movement and energy of the particles.1:01 understand the three states of matter in terms of the arrangement, movement and energy of the particles.Has to be heated strongly and so does the iron wool. The reaction is faster than that of iodine but slower than that of chlorine. Has to be warmed and the iron wool heated. Reacts with heated iron wool very quickly, although not as quickly as fluorine does. Very few scientists handle fluorine because it is so dangerous. You can see the trend in reactivity if you react the halogens with iron wool. įluorine is the most reactive element of all in Group 7. This is the opposite trend to that seen in the alkali metals in Group 1 of the periodic table. The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group.