Study Guides
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1.
Physics and Early Theories Help
Introduction to Physics and Early Theories The idea that matter exists in the form of particles, rather than as a continuous mass, is many centuries old. How do we explain the fact that some substances are more dense than others, that some ...
Source: McGraw-Hill Professional -
2.
The Nucleus Help
Introduction to the Nucleus The part of an atom that gives an element its identity is the nucleus . It is made up of two kinds of particles, the proton and the neutron . Both are extremely dense. Protons and neutrons ...
Source: McGraw-Hill Professional -
3.
Outside the Nucleus Help
Introduction Surrounding the nucleus of an atom are particles having electric charge opposite from the charge of the protons. These are electrons . Physicists arbitrarily call the electron charge negative and the proton charge ...
Source: McGraw-Hill Professional -
4.
Energy from Matter Help
Introduction The splitting up of an atomic nucleus is known as nuclear fission . This is, in a sense, the opposite of nuclear fusion, which occurs inside the Sun and other stars. The very first atomic bombs, developed in the 1940s, ...
Source: McGraw-Hill Professional -
5.
Physics and Compounds Help
Introduction Different elements can join together, sharing electrons. When this happens, the result is a chemical compound . One of the most common compounds on Earth is water, the result of two hydrogen atoms joining with an atom of ...
Source: McGraw-Hill Professional -
6.
Particles of Matter Practice Test
Review the following concepts if needed: Physics and Early Theories Help
Source: McGraw-Hill Professional -
7.
Basic States of Matter Help
Introduction to Basic States of Matter Thousands of years ago, in the time of the ancient Greek and Roman civilizations, scientists believed that all things in the material universe consisted of combinations of four “elements”: ...
Source: McGraw-Hill Professional -
8.
The Solid Phase Help
Introduction A sample of matter in the solid phase will retain its shape unless subjected to violent impact, placed under stress, or subjected to high temperatures. Examples of solids are rock, steel at room temperature, water ice, salt, wood, ...
Source: McGraw-Hill Professional -
9.
The Liquid Phase Help
Introduction In the liquid state or phase, a substance has two properties that distinguish it from the solid phase. First, a liquid changes shape so that it conforms to the inside boundaries of any container in which it is placed. Second, a ...
Source: McGraw-Hill Professional -
10.
The Gaseous Phase Help
Introduction The gaseous phase of matter is similar to the liquid phase insofar as a gas will conform to the boundaries of a container or enclosure. However, a gas is much less affected by gravity than a liquid. If you fill up a bottle with a ...
Source: McGraw-Hill Professional
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