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Physical properties are those that can be observed without changing the identity of the substance. The general properties of matter such as color, density, hardness, are examples of physical properties. Properties that describe how a substance changes into a completely different substance are called chemical properties. Flammability and corrosion/oxidation resistance are examples of chemical properties.
Review and Practice on Chemical vs. Physical Properties and Changes Review of Chemical vs. Physical Properties and Changes * Chemical vs. Physical Properties. o Chemical properties are properties of an element or compound in chemical reactions. For example, the fact that sodium reacts with water is a chemical property. o Physical properties are properties of an element or compound that can be observed without a chemical reaction of the substance. A substance's color and density are physical properties. * Chemical vs. Physical Changes. o In a physical change, the substances are not altered chemically, but merely changed to another phase (i.e. gas, liquid, solid) or separated or combined. o In a chemical change, the substances are altered chemically and display different physical and chemical properties after the change. Practice on Identifying Chemical and Physical Properties Water boils at 100 degrees Celcius. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Diamonds are capable of cutting glass. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Water can be separated by electrolysis into hydrogen and oxygen. * This is a physical property. * This is a chemical property. Correct answer:This is a chemical property. Sugar is capable of dissolving in water. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Vinegar will react with baking soda. * This is a physical property. * This is a chemical property. Correct answer:This is a chemical property. Yeast acts on sugar to form carbon dioxide and ethanol. * This is a physical property. * This is a chemical property. Correct answer:This is a chemical property. Wood is flammable. * This is a physical property. * This is a chemical property. Correct answer: Aluminum has a low density. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Ammonia is a gas at room temperature. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Bromine has a red color. * This is a physical property. * This is a chemical property. Correct answer:This is a physical property. Practice on Identifying Chemical and Physical Changes Dry ice, solid carbon dioxide, is sublimed at room temperature. * This is a physical change. * This is a chemical change. Correct answer:This is a physical change. Salt is dissolved in water. * This is a physical change. * This is a chemical change. Correct answer:This is a physical change. Iron rusts in a damp environment. * This is a physical change. * This is a chemical change. Correct answer:This is a chemical change. Gasoline burns in the presence of oxygen. * This is a physical change. * This is a chemical change. Correct answer:This is a chemical change. Gasoline is burned to form carbon dioxide and water. Hydrogen peroxide decomposes to water and oxygen. * This is a physical change. * This is a chemical change. Correct answer:This is a chemical change. |