D Aluminium, chromium and manganese are all moderately reactive metals. Use the following information to arrange them in the correct reactivity
series order. Start with the most reactive one.
Chromium is manufactured by heating chromium(III) oxide with aluminium.
If manganese is heated with aluminium oxide there is no reaction.
- If manganese is heated with chromium(III) oxide, chromium is produced,

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