Iron (for making steel), copper and aluminium is obtained from substances found in the Earth’s crust. The metals are made into many useful things. When no longer required, the metal articles are thrown away as waste or recycled. Explain why it is important to recycle these metals, rather than put them in general household waste?

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next