Chapter 2 Matter & Change
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1 Matter is anything that has mass and takes up space Matter can exist in four states Solid Liquid Gas Plasma
2 Matter can be classified into two main groups Pure Substance Mixture A pure substance is a material with a definite composition and fixed properties Pure substances are divided into two groups Elements Compounds
3 An element is a pure substance with only one kind of atom All elements are found in the periodic table There are about 118 known elements Elements are represented with a chemical symbol Many symbols are based on the latin name Each symbol begins with an uppercase letter and subsequent letters are always lowercase
4 Compounds are two or more different elements chemically combined Compounds are represented with a chemical formula The formula tells what elements and how many atoms CO 2 is one carbon atom and two oxygen atoms
5 Mixtures are a combination of two or more substances, where each substance maintains its identity The major difference between a mixture and a compound is that mixtures are easily separated There are two types of mixtures Homogeneous Heterogeneous
6 A homogeneous mixture is a mixture that looks the same (uniform) It has only one phase Homogeneous mixtures are also called solutions Solutions are composed of two parts Solute is being dissolved Solvent does the dissolving
7 Not all solutions are liquid Solid solution gold jewelry Liquid solution gasoline Gas solution air
8 Heterogeneous mixtures can look different (non uniform) Heterogeneous mixture may settle orange juice Those mixtures are called suspensions
9 A heterogeneous mixture can sometimes look the same Those mixtures are called colloids They appear the same until light is passed through In a colloid, the light is scattered Tyndall Effect
10 Determine whether the following is an element, compound, homogeneous mixture, or heterogeneous mixture Copper Granite Carbon Dioxide Soda Concrete Salad Dressing Stainless Steel Rubbing Alcohol Salt Silicon Sugar Helium Air Egg
11 Another way scientists classify matter is according to properties Properties are used to describe matter Properties can be either Intensive Extensive
12 An intensive property is independent on the amount of the sample For example, the density of aluminum is always 2.7 g/cm 3 Regardless if the sample is large or small An extensive property is dependent on the amount of sample A large sample of aluminum will have a greater mass than a smaller sample
13 Properties can also be classified as Physical Chemical A physical property is a property that can be observed without changing the composition of the substance
14 A chemical property is a property that can only be observed when the composition of a substance changes
15 Identify the following as either physical or chemical properties Blue Color Flammability Density Melting Point Solubility Reacts with Acid to form H 2 Supports Combustion Boiling Point Sour Taste Hardness Can Neutralize a Base Reacts with a Base to Form Water Luster Odor
16 Matter can also undergo changes Matter may change its appearance but not its composition That is a physical change Physical changes can be reversible or irreversible
17 Matter may change its appearance and its composition That is a chemical change Another name for a chemical change is a chemical reaction The starting materials in a chemical reaction are called reactants The ending materials in a chemical reaction are called products
18 Chemical changes are usually accompanied with four possible clues a transfer of energy a change in color the production of a gas the formation of a precipitate
19 Determine whether the following is a physical or chemical change. Sodium hydroxide dissolves in water. A pellet of sodium is sliced in two. Water is heated and changed to steam. Iron rusts. Evaporation. When placed in water, a sodium pellet catches on fire. Sugar dissolves in water. A tire is inflated with air. Pancakes cooking on a griddle. Food is digested in the stomach.
20 Regardless if the change is physical or chemical, the Law of Conservation of Mass is observed The Law of Conservation of Mass states that matter cannot be created or destroyed Therefore the initial amount of substance must equal the final amount of substance.
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