Predicting the properties of francium
3 marks · EasyFrancium is expected to react rapidly when exposed to air or water.
State what would happen to francium's shiny surface if a small piece was exposed to air.
Predict one observation you would expect if francium was added to water.
Name the gas produced in the reaction between francium and water.
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(a) It would tarnish or lose its shine almost instantly.
(b) Very violent or explosive reaction / fizzing / produces heat / moves rapidly / flames (accept any correct observation)
(c) Hydrogen
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States the surface would tarnish/lose its shine/almost instantly.
B1 (b) · 1 mark · States francium reacts violently, fizzes, moves rapidly, produces heat or flame on water.
B1 (c) · 1 mark · Names the gas as hydrogen.
Worked solution
a) Francium's surface would tarnish almost instantly in air.
b) It would react very violently with water, possibly with flames or explosions.
c) The gas produced is hydrogen.