Which of the following statements is true of enzymes a. they're unusable after a reaction b. they don't provide an active site for substrates to bind in a reaction c. they change shape after a reaction d. they act on a specific type of substrate in a reaction

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.