Leave out "nonfunctional" and you've got a more or less true statement.
they speed up chemical reactions
Sunlight is used in the bromine water and iodine solution tests to provide the energy needed for the reactions to occur. The UV light in sunlight promotes the oxidation of bromide ions to form bromine and the oxidation of iodide ions to form iodine, which are key reactions in these tests.
Broad substrate specificity refers to an enzyme's ability to catalyze reactions with a wide range of substrates, rather than being limited to one specific substrate. This property allows the enzyme to interact with multiple substrates and carry out various biochemical reactions, making it versatile in its function.
Yes, a catalyst can be re-used, because It is NOT actually used in a chemical reaction. A catalyst will increase the rate of reaction by attracting reactants, but the catalyst is not a reactant. However, the reuse cannot be done indefinitely then, depending on the severity of the reaction conditions, it can be occur a small, but accumulative deactivation of the catalys.