Which element or compound has lost electrons in this oxidation-reduction reaction? 4Li + 2CoO → 2Co + 2Li2O

A.
CoO
B.
Li2O
C.
Li
D.
Co
E.
O

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

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