Chemical reactions are .

A.) never able to be controlled

B.)the processes in which molecules interact to form new substances

C.)not possible

D.)the processes by which new atoms are made

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Increasing the substrate concentration in an enzymatic reaction could overcome which of the following? a) the need for a coenzymeb) allosteric inhibitionc) competitive inhibitiond) insufficient cofactors

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.