6.2

Imagine that you are conducting an experiment on a yeast enzyme known as sucrase. This enzyme is used by yeast cells to break down the disaccharide sucrose into the monosaccharides glucose and fructose. What type of reaction is this?

Exergonic

In cells, endergonic reactions are often coupled with exergonic reactions that store energy.

False

The burning of sugar is an example of an endergonic reaction, and photosynthesis is an example of an exergonic reaction.

False

You fill two balloons with gas, one with hydrogen and one with carbon dioxide. You hold a match to each balloon. The hydrogen balloon explodes in a small fireball. The carbon dioxide balloon pops where the match burns it, but nothing else happens. How can you explain this?

Hydrogen was able to participate in an exergonic reaction and carbon dioxide wasn'

When, if ever, do molecules stop moving?

at absolute zero (-273.15°C)

In your body, what process converts the chemical energy found in glucose into the chemical energy found in ATP?

cellular respiration

Activation energy is necessary for all ________ reactions.

chemical

"Conservation of energy" refers to the fact that _____.

energy cannot be created or destroyed but can be converted from one form to another

Chemical energy is a form of _____ energy.

potential

In exergonic chemical reactions,

reactants have more energy than products

Why is photosynthesis considered an endergonic reaction?

Low-energy reactants are converted to high-energy products.

When grilling using charcoal, people often wet the charcoal with lighter fluid first. The lighter fluid catches fire first and eventually sets the coals burning. Why does the lighter fluid light faster than the charcoal?

Setting lighter fluid on fire takes less activation energy than setting charcoal on fire.

The photosynthetic reaction is considered an endergonic reaction.

True

What is the definition of an endergonic reaction?

a reaction in which the products have more energy than the reactants

Which of these is exhibiting kinetic energy?

a space station orbiting Earth

In the liver, the polysaccharide glycogen is broken down into glucose monomers. The glucose molecules are then released into the blood when blood sugar levels need to be raised. This process is an example of a(n) ________ reaction.

exergonic

When solid sodium hydroxide is added to water, the solution gets hot. This is an example of a(n)

exergonic process

A(n) ________ chemical reaction releases energy, whereas a(n) ________ reaction requires an input of energy.

exergonic; endergonic

Plants use sunlight to convert carbon dioxide and water into sugar and oxygen. The energy in the sunlight is what type of energy?

kinetic energy