ATI TEAS 7 CHEMISTRY REVIEW REVISED

AREAS COVERED 1. Understanding States of Matter. 2. Understanding Changes in States of Matter. 3. Understanding Properties of Matter 4. Understanding Chemical Bonds. 5. Understanding Chemical Solutions. 6. Understanding Chemical Reactions. 7. Understanding Acid Base Balance. 8. Understanding Balancing Chemical Equations. NB: Questions related to chemistry test your knowledge of chemical properties and processes. You may be asked questions about states of matter, properties of matter, phase changes, chemical bonds, chemical solutions, chemical reactions, and acids and bases. You may be asked to balance chemical equations. Let’s get started in understanding how chemistry is important on the ATI TEAS. ATI TEAS 7 CHEMISTRY REVIEW REVISED UNDERSTANDING STATES OF MATTER Matter is made up of microscopic particles that move different speeds depending on the energy they are exposed to. We measure this energy as temperature. The molecules can move either quickly and randomly or hardly at all. When the energy is high, matter take the form of a gas, in which molecules are moving about quickly and are far apart. Gases have no fixed form. Molecules are free to move at random past each other, and they tend to fill any container that holds them. If a gas is not contained, its molecules will disperse. Lower temperatures result in a liquid, in which molecules cohere but are fluid. Coherence means that the molecules remain close together, but they can change position by sliding over one another. In liquids, molecules move less freely than in a gaseous state, sliding past one another. They have a fixed volume but will flow freely unless they fill a portion of a container. When the temperature is low, matter takes the form of a solid, in which molecules are packed closely together and retain their positions. Solid matter is rigid, and molecules retain a uniform spacing. A solid has a defined form, which is brittle. It can be broken into pieces but tends to stay together. ATI TEAS 7 CHEMISTRY REVIEW REVISED A somewhat unusual state of matter is plasma, which is like a gas in many of its properties but ATI TEAS 7 CHEMISTRY REVIEW REVISED carries an electric charge.