In chemistry, the state symbols (s), (l), (g) and (aq) are used to represent the physical state of substances.
The table shows some physical changes of state. Complete the table by writing the appropriate state symbol before and after each change.
| Change of State | State symbol before change | State symbol after change |
|---|---|---|
| Liquid bromine evaporates in a fume cupboard | ||
| Melted wax hardens as a candle cools | ||
| Water vapour in the air deposits directly to form frost on a freezing night |
Some solid calcium carbonate is added to a beaker of dilute nitric acid.
Complete the equation for the reaction that occurs by writing the appropriate state symbol after each formula:
CaCO3(…… )+2HNO3(…… )→Ca(NO3)2(…… )+H2O(…… )+CO2(…… ) \text{CaCO}_3(\dots\dots) + 2\text{HNO}_3(\dots\dots) \rightarrow \text{Ca(NO}_3)_2(\dots\dots) + \text{H}_2\text{O}(\dots\dots) + \text{CO}_2(\dots\dots) CaCO3(……)+2HNO3(……)→Ca(NO3)2(……)+H2O(……)+CO2(……)Which state symbol is used for the vast majority of the elements in the Periodic Table at room temperature (25∘C25^\circ\text{C}25∘C)?
12 exam-style questions on Edexcel IGCSE Chemistry States of matter. Each one has a worked solution and a mark scheme showing where the marks go.