3 interactive labs · IGCSE Chemistry 0620
· Pick any element to see its configuration, group and period, then chart melting point, density, radius and reactivity down a group or across a period.
Pick any element to see its configuration, group and period, then chart melting point, density, radius and reactivity down a group or across a period.
You will be able to
· Drop lithium, sodium or potassium into water with universal indicator, compare how fast each reacts, collect the hydrogen and predict rubidium.
Drop lithium, sodium or potassium into water with universal indicator, compare how fast each reacts, collect the hydrogen and predict rubidium.
You will be able to
· Predict, then add chlorine, bromine or iodine water to potassium halide solutions and use the colour changes to rank the halogens by reactivity.
Predict, then add chlorine, bromine or iodine water to potassium halide solutions and use the colour changes to rank the halogens by reactivity.
You will be able to
Examiner's note. Link position to structure: the group number = the number of outer-shell electrons and the period number = the number of occupied shells. For a prediction, quote the trend and extend it: Group VII melting points increase down the group, so astatine is a solid at r.t.p. The classic slip is saying noble gases are unreactive because they are “stable”: say they have a full outer shell, so they do not need to lose, gain or share electrons.
