Which statement about water is correct?
It turns anhydrous copper(II) sulfate from pink to blue.
It turns anhydrous copper(II) sulfate from white to blue.
It turns cobalt(II) chloride paper from blue to white.
It turns cobalt(II) chloride paper from pink to blue.
Which statement about sulfuric acid is correct?
It is made by the Haber process.
It is made in the atmosphere by the action of lightning.
It reacts with ammonia to produce a fertiliser.
It reacts with copper metal to produce hydrogen gas.
The apparatus shown is set up and left for a week.
Which diagram shows the level of the water at the end of the week?
See water-level diagram A in the official apparatus figure.
See water-level diagram B in the official apparatus figure.
See water-level diagram C in the official apparatus figure.
See water-level diagram D in the official apparatus figure.
Which statement identifies a sample of water as pure?
It melts at room temperature.
It turns anhydrous copper(II) sulfate blue.
It turns hydrated cobalt(II) chloride from blue to pink.
It boils at .