The table shows the formulae of some positive and negative ions. It also shows the formulae of some compounds containing these ions.
| Cu2+\text{Cu}^{2+}Cu2+ | Fe3+\text{Fe}^{3+}Fe3+ | NH4+\text{NH}_4^+NH4+. | |
|---|---|---|---|
| Cl−\text{Cl}^-Cl−. | FeCl3\text{FeCl}_3FeCl3 | NH4Cl\text{NH}_4\text{Cl}NH4Cl | |
| SO42−\text{SO}_4^{2-}SO42−. | CuSO4\text{CuSO}_4CuSO4 | Fe2(SO4)3\text{Fe}_2(\text{SO}_4)_3Fe2(SO4)3 | |
| CO32−\text{CO}_3^{2-}CO32−. | CuCO3\text{CuCO}_3CuCO3 | (NH4)2CO3\text{(NH}_4)_2\text{CO}_3(NH4)2CO3 |
Complete the table by giving the formulae of the three missing compounds.
The correct name of the compound with the formula Fe2(SO4)3\text{Fe}_2(\text{SO}_4)_3Fe2(SO4)3 is:
Which of these descriptions is correct for NH4Cl(s)\text{NH}_4\text{Cl(s)}NH4Cl(s) and for NH4Cl(aq)\text{NH}_4\text{Cl(aq)}NH4Cl(aq)?
| NH4Cl(s)\text{NH}_4\text{Cl(s)}NH4Cl(s) | NH4Cl(aq)\text{NH}_4\text{Cl(aq)}NH4Cl(aq) | |
|---|---|---|
| A | colourless | colourless |
| B | colourless | white |
| C | white | colourless |
| D | white | white |
These tests are carried out on two separate samples of copper(II) sulfate solution.
Which observation is correct for test 1?
Give the names of the two products formed in test 1.
In test 2, there is no visible change after adding dilute hydrochloric acid. State why the acid is added.
In test 2, barium sulfate is formed after adding barium chloride solution. State the observation that is made.
Describe a test to show that a sample of CuCO3\text{CuCO}_3CuCO3 contains the CO32−\text{CO}_3^{2-}CO32− ion.
