Write the letter A on the diagram to indicate where air is blown into the furnace, and the letter W to show where waste gases leave the furnace.
How can you tell from the diagram that slag is less dense than molten iron?
What does the term thermal decomposition mean?
Complete this chemical equation for the reaction. $\text{CaCO}_3 \rightarrow \text{CaO} + \ldots$
A further blast-furnace reaction uses calcium oxide, CaO. Describe this reaction and explain why it matters.
Draw a labelled electrolysis cell that could be used for this reaction. Include the electrodes, the electrolyte and the power supply in your sketch.
State the name of an element that could serve as the electrodes.
State one property that an electrode should possess.
Write the formula of iron pentacarbonyl.
Explain why the gaseous product is hazardous.
What two substances must be in contact with iron for it to rust?
How do pH and temperature influence the rusting rate? pH ............ temperature ............