Can someone give me  an understanding of Products and Reactants? The first image is from the the first chapter where it was introduced under the subject of life, chemistry and water. The second image is on another chapter I am speaks under the subject of Energy, Enzymes and Biological reactions. I can't understand it without the root understanding and application of Products and Reactants.

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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Can someone give me  an understanding of Products and Reactants? The first image is from the the first chapter where it was introduced under the subject of life, chemistry and water. The second image is on another chapter I am speaks under the subject of Energy, Enzymes and Biological reactions. I can't understand it without the root understanding and application of Products and Reactants. 

Bonds Form and Break in Chemical Reactions
In chemical reactions, atoms or molecules interact to form
new chemical bonds or break old ones. As a result of bond for-
mation or breakage, atoms are added to or removed from mol-
ecules, or the linkages of atoms in molecules are rearranged.
When any of these alterations occur, molecules change from
one type to another, usually with different chemical and physi-
cal properties. In biological systems, chemical reactions are
accelerated by molecules called enzymes (discussed in more
detail in Chapter 6).
The atoms or molecules entering a chemical reaction are
called the reactants, and those leaving a reaction are the
products. A chemical reaction is written with an arrow show-
ing the direction of the reaction; reactants are placed to the left
of the arrow, and products are placed to the right. Both reac-
tants and products are usually written in chemical shorthand
as formulas.
For example, the overall reaction of photosynthesis, in
which carbon dioxide and water are combined to produce sug-
ars and oxygen (see Chapter 8), is written as follows:
6 CO₂ + 6H₂O → C6H12O6 +60₂
water
a sugar
carbon
dioxide
molecular
oxygen
The number in front of each formula indicates the number of
molecules of that type among the reactants and products (the
number 1 is not written). Notice that there are as many atoms
of each element to the left of the arrow as there are to the right,
even though the products are different from the reactants. This
balance reflects the fact that in such reactions, atoms may be
rearranged but not created or destroyed. Chemical reactions
written in balanced form are known as chemical equations.
With the information about chemical bonds and reactions
provided thus far, you are now ready to examine the effects of
chemical structure and bonding, particularly hydrogen bond-
ing, in the production of the unusual properties of water, the
most important substance to life on Earth.
Transcribed Image Text:Bonds Form and Break in Chemical Reactions In chemical reactions, atoms or molecules interact to form new chemical bonds or break old ones. As a result of bond for- mation or breakage, atoms are added to or removed from mol- ecules, or the linkages of atoms in molecules are rearranged. When any of these alterations occur, molecules change from one type to another, usually with different chemical and physi- cal properties. In biological systems, chemical reactions are accelerated by molecules called enzymes (discussed in more detail in Chapter 6). The atoms or molecules entering a chemical reaction are called the reactants, and those leaving a reaction are the products. A chemical reaction is written with an arrow show- ing the direction of the reaction; reactants are placed to the left of the arrow, and products are placed to the right. Both reac- tants and products are usually written in chemical shorthand as formulas. For example, the overall reaction of photosynthesis, in which carbon dioxide and water are combined to produce sug- ars and oxygen (see Chapter 8), is written as follows: 6 CO₂ + 6H₂O → C6H12O6 +60₂ water a sugar carbon dioxide molecular oxygen The number in front of each formula indicates the number of molecules of that type among the reactants and products (the number 1 is not written). Notice that there are as many atoms of each element to the left of the arrow as there are to the right, even though the products are different from the reactants. This balance reflects the fact that in such reactions, atoms may be rearranged but not created or destroyed. Chemical reactions written in balanced form are known as chemical equations. With the information about chemical bonds and reactions provided thus far, you are now ready to examine the effects of chemical structure and bonding, particularly hydrogen bond- ing, in the production of the unusual properties of water, the most important substance to life on Earth.
The First Law of
Addresses the Energy Content
of Systems and Their Surroundings
Thermodynamics
The first law of thermodynamics states that energy can be
transformed from one form to another or transferred from one
place to another, but it cannot be created or destroyed. That is, in
any process that involves an energy change, the total amount of
energy in a system and its surroundings remains constant. This
law is also called the principle of conservation of energy.
If energy can be neither created nor destroyed, what is the
ultimate source of the energy living organisms use? For almost
all organisms, the ultimate source is the Sun (Figure 6.2). Plants
capture the kinetic energy of light radiating from the Sun by
absorbing it and converting it to the chemical energy of com-
plex organic molecules-primarily sugars, starches, and lipids
(see Chapter 8). These substances are used as fuels by the plants
themselves, by animals that feed on plants, and by organisms
(such as fungi and bacteria) that break down the bodies of dead
organisms. The chemical energy stored in sugars and other
organic molecules is used for growth, reproduction, and other
work of living organisms.
Eventually, most of the solar energy absorbed by green
plants is converted into heat energy as the activities of life take
place. Heat (a form of kinetic energy) is largely unusable by liv-
ing organisms. As a result, most of the heat released by the
reactions of living organisms radiates to their surroundings,
and then from Earth into space.
How does the principle of conservation of energy apply to
biochemical reactions? Molecules have both kinetic and poten-
tial energy. Kinetic energy for molecules above absolute zero
(-273°C) is reflected in the constant motion of the molecules,
whereas potential energy for molecules is chemical energy,
which is the energy contained in the arrangement of atoms and
Transcribed Image Text:The First Law of Addresses the Energy Content of Systems and Their Surroundings Thermodynamics The first law of thermodynamics states that energy can be transformed from one form to another or transferred from one place to another, but it cannot be created or destroyed. That is, in any process that involves an energy change, the total amount of energy in a system and its surroundings remains constant. This law is also called the principle of conservation of energy. If energy can be neither created nor destroyed, what is the ultimate source of the energy living organisms use? For almost all organisms, the ultimate source is the Sun (Figure 6.2). Plants capture the kinetic energy of light radiating from the Sun by absorbing it and converting it to the chemical energy of com- plex organic molecules-primarily sugars, starches, and lipids (see Chapter 8). These substances are used as fuels by the plants themselves, by animals that feed on plants, and by organisms (such as fungi and bacteria) that break down the bodies of dead organisms. The chemical energy stored in sugars and other organic molecules is used for growth, reproduction, and other work of living organisms. Eventually, most of the solar energy absorbed by green plants is converted into heat energy as the activities of life take place. Heat (a form of kinetic energy) is largely unusable by liv- ing organisms. As a result, most of the heat released by the reactions of living organisms radiates to their surroundings, and then from Earth into space. How does the principle of conservation of energy apply to biochemical reactions? Molecules have both kinetic and poten- tial energy. Kinetic energy for molecules above absolute zero (-273°C) is reflected in the constant motion of the molecules, whereas potential energy for molecules is chemical energy, which is the energy contained in the arrangement of atoms and
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