The document discusses several key South African chemical industries. It describes Sasol, which converts coal to liquid fuels since South Africa lacks oil and gas resources. It also discusses the chloralkali industry, which produces chlorine and sodium hydroxide through electrolysis of salt water. Fertilizer production is also covered, focusing on nitrogen, phosphate, and potassium fertilizers. The batteries section defines batteries and their components, the difference between primary and secondary batteries, and Peukert's law relating current, time and capacity.