When is potential energy transformed into kinetic energy?
a. when is an object at rest is lifted to a higher elevation.
b. when an object at rest remains at rest.
c. when an object in motion is stopped and put at rest.
d. when an object in motion is stopped and put at rest.

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

Based on the formulas, select the compounds below that are covalent: kbr sif4 al2o3 co2 naco3 s7o2 pcl3 fe3n2 h2o s2f10

Type the correct answer in each box.balance the chemical equation.__ n203 ➡️ __ n2 +__ o2