TEAS 7 Chemistry Review

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TEAS 7 CHEMISTRY REVIEWAREAS COVERED1. Understanding States of Matter.2.Understanding Changes in States of Matter.3.Understanding Properties of Matter4.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 beasked questions about states of matter, properties of matter, phase changes,chemicalbonds, chemicalsolutions,chemicalreactions, and acids and bases. You may be asked to balance chemical equations. Let's getstarted in understanding how chemistry is important on theATI TEAS.

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UNDERSTANDING STATES OF MATTERMatter is made up of microscopic particles that move different speeds depending on the energythey are exposed to. We measure this energy as temperature. The molecules can move eitherquickly and randomly or hardly at all.When the energy is high, matter take the form of a gas, in which molecules are moving aboutquickly and are far apart. Gases have no fixed form. Molecules are free to move at random pasteach other, and they tend to fill any container that holds then. If a gas is not contained, itsmolecules will disperse.Lower temperatures result in a liquid, in which molecules cohere but are fluid. Coherence meansthat the molecules remain close together, but they can change position by sliding over oneanother. In liquids, molecules move less freely than in a gaseous state, sliding past cne another.They have a fixed volume but will flow freely unless they fill a portionofa container.When the temperature is low, matter takes the form of a solid, in which molecules are packedclosely together and retain their positions. Solid matter is rigid, and molecules retain a uniformspacing. A solid has a defined form, which is brittle. It can be broken into pieces but tends to staytogether.A somewhat unusual state of matter is plasma, wrhich is like a gas in many of its properties butcarries an electric charge.The TEAS focus on solids, liquids,andgases.UNDERSTANDING CHANGES INSTATE OF MATTERThe state of matter depends on temperature and pressure. Higher temperatures cause moleculesto energize and move farther apart. Increasing pressure forces molecules closer together. Meltingis the phase change from solid to liquid and boiling is the phase change from liquid to gas. There

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is also a direct change from solid to gas known as sublimation. The phase change from gas toliquid is condensation and the change from liquid to solid is freezing. A direct change from gas tosolid is deposition.All types of matter can be described in terms of the physical and chemical properties eachsubstance has. Physical properties are observable and there is an extensive list of physicalproperties that one could observe about a substance. A few examples are density. thetemperatures at which the substance undergoes phase changes, malleability, conductivityspecific heat capacity, mass, volume, color, and many other properties. Physical properties arefurther divided into intensive and extensive properties. An intensive property does not depend onthe size or amount of matter in the object, while an extensive property!does depend on theamount of matter in the object. For example, mass is extensive because the measurement wouldchange the size of the sample. Boiling point is intensive because the temperature at which theobject boils is not dependent on its volume.Understanding properties of matter- WATERWater is a polar inorganic compound that is transparent, and nearly colorless. H2O is a covalentcompound because oxygen and tnidrogen are nonmetals. It has 8 total valence electrons (6 fromoxygen and 1 from each fgidrogen). Breaking rhe bonds requires a lot of energy, so water has avery high specific heat and hear of vaporization. The molar mass of water is 18.02 g/mol. It

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