Chapter 6 Pre Assignment

Suppose that, in a given reaction, the enthalpy (H) increases by 10 units, and the disorder (TS) increases by 12 units. By how many units did the Gibbs free energy change?

-2

As a cat pounces on a mouse, its muscles consume 10 units of potential energy (which the cat previously gained from the food it consumed). However, the pounce itself only required 4 units of kinetic energy. How many units of energy were dissipated as heat?

6

Which of the statements is true about exergonic reactions?

Exergonic reactions are catabolic.

Imagine that a researcher tries to reduce the size of an enzyme by removing all the amino acids from the protein except those flanking, and constituting, the active site. Why wouldn't this work?

Without the additional amino acids, the protein may not fold properly. All of these choices are correct. ++ The removal of the amino acids may affect the ability of the enzyme to bind to substrates. The removal of the amino acids will likely affect the shape of the active site.

In a reaction, enzymes change the:

activation energy.

Enzymes in your gastrointestinal tract digest your lunch. These chemical reactions are categorized as:

catabolism.

The first law of thermodynamics states that:

energy cannot be created or destroyed.

Of the molecules, which has the greatest chemical potential energy?

glucose

Oak trees are categorized as:

photoautotrophs.

Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are _____ and have _____.

weak; a lot of potential energy