Life on Earth: At a Glance

Life on Earth
Audesirk & Audesirk
Prentice-Hall, Inc.

Matter and Energy: Energy exists in several forms that can be interconverted.

The Structure of Matter
Atoms, the smallest units of elements, are composed of still smaller particles.
Atoms will react with other atoms only when there are vacancies in their outermost electron shells.

Chemical Bonds: Joining Atoms to Make Molecules
Atoms can become stable by gaining or losing electrons, forming charged ions; the attraction between oppositely charged ions produces ionic bonds.
Atoms can become stable by sharing electrons with other atoms, forming covalent bonds.
Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.
The Structure of Matter: Atoms, the smallest units of elements, are composed of still smaller particles.
Atoms will react with other atoms only when there are vacancies in their outermost electron shells.

Chemical Bonds: Joining Atoms to Make Molecules
Atoms can become stable by gaining or losing electrons, forming charged ions; the attraction between oppositely charged ions produces ionic bonds.
Atoms can become stable by sharing electrons with other atoms, forming covalent bonds.
Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; Atoms will react with other atoms only when there are vacancies in their outermost electron shells.

Chemical Bonds: Joining Atoms to Make Molecules
Atoms can become stable by gaining or losing electrons, forming charged ions; the attraction between oppositely charged ions produces ionic bonds.
Atoms can become stable by sharing electrons with other atoms, forming covalent bonds.
Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.
Chemical Bonds: Joining Atoms to Make Molecules: Atoms can become stable by gaining or losing electrons, forming charged ions; the attraction between oppositely charged ions produces ionic bonds.
Atoms can become stable by sharing electrons with other atoms, forming covalent bonds.
Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; Atoms can become stable by sharing electrons with other atoms, forming covalent bonds.
Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; Hydrogen bonds are weak electrical attractions between the polar parts molecules.

Organic and Inorganic Molecules

Water and Life
Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.
Organic and Inorganic Molecules
Water and Life: Water interacts with many other molecules.
The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; The ph of a solution is a measure of its concentration of hydrogen ions.
A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; A buffer helps maintain a solution at a relatively constant pH.
Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; Water moderates the effects of temperature changes.
Water forms an unusual solid, ice.
Water molecules tend to stick together.; Water forms an unusual solid, ice.
Water molecules tend to stick together.; Water molecules tend to stick together.

Designed in cooperation with Andrew Stull and Steven Brunasso.

Last Update - July 25, 1997