A scientist set up an experimental ecosystem in a sealed room with no windows. The experimental ecosystem has plants and animals that eat those plants. The
scientist can control whether the room is light or dark with a light switch outside
the room.

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products