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Compound d Homogeneous d Compound d Homogeneous d Compound d Homogeneous d Element Element Element d d d Heterogeneous d Heterogeneous d Heterogeneous d 5 Signs of a Chemical Reaction: Spontaneous color change Production of a new substance (solid = precipitation, gas = bubbling) Formation of a new odor Spontaneous change in temperature Spontaneous generation of light 5 Signs of a Chemical Reaction: Spontaneous color change Production of a new substance (solid = precipitation, gas = bubbling) Formation of a new odor Spontaneous change in temperature Spontaneous generation of light 5 Signs of a Chemical Reaction: Spontaneous color change Production of a new substance (solid = precipitation, gas = bubbling) Formation of a new odor Spontaneous change in temperature Spontaneous generation of light PHYSICAL PROPERTIES - can observe w/o changing the substance’s identity at an atomic level. Intensive(does not depend on amount): EX: shape, texture, color, odor, luster, malleability, ductility, conductivity, hardness, melting/freezing/boiling point, density, viscosity, buoyancy Extensive (depends on amount): EX: mass, volume, length PHYSICAL CHANGES – do not change a substance’s identity at an atomic level. Can be reversed with a physical change. CHEMICAL PROPERTIES – can’t observe without changing the substance’s identity at an atomic level. Examples: rust, decomposing, going sour/rancid, rotting, tarnishing, oxidation, burning, combustibility, flammability, toxicity, electronegativity, reactivity with other substances, pH, corrosiveness CHEMICAL CHANGES – alter the substance’s identity at an atomic level. Can’t be reversed with a physical change. Examples: burning, dissolving something in an acid, letting iron rust, letting silver tarnish, mixing vinegar and baking soda, cooking an egg Examples: breaking, tearing, crushing, smashing, cutting, melting, freezing, boiling, evaporation, condensation, dissolving into a solution, mixing together, wetting, drying, painting Also called a CHEMICAL REACTION (5 signs to watch for) formation of an odor, change in temp, formation of a precipitate, change in color, formation of gas PHYSICAL PROPERTIES - can observe w/o changing the substance’s identity at an atomic level. CHEMICAL PROPERTIES – can’t observe without changing the substance’s identity at an atomic level. Intensive(does not depend on amount): EX: shape, texture, color, odor, luster, malleability, ductility, conductivity, hardness, melting/freezing/boiling point, density, viscosity, buoyancy Extensive (depends on amount): EX: mass, volume, length PHYSICAL CHANGES – do not change a substance’s identity at an atomic level. Can be reversed with a physical change. Examples: rust, decomposing, going sour/rancid, rotting, tarnishing, oxidation, burning, combustibility, flammability, toxicity, electronegativity, reactivity with other substances, pH, corrosiveness CHEMICAL CHANGES – alter the substance’s identity at an atomic level. Can’t be reversed with a physical change. Examples: burning, dissolving something in an acid, letting iron rust, letting silver tarnish, mixing vinegar and baking soda, cooking an egg Examples: breaking, tearing, crushing, smashing, cutting, melting, freezing, boiling, evaporation, condensation, dissolving into a solution, mixing together, wetting, drying, painting Also called a CHEMICAL REACTION (5 signs to watch for) formation of an odor, change in temp, formation of a precipitate, change in color, formation of gas PHYSICAL PROPERTIES - can observe w/o changing the substance’s identity at an atomic level. CHEMICAL PROPERTIES – can’t observe without changing the substance’s identity at an atomic level. Intensive(does not depend on amount): EX: shape, texture, color, odor, luster, malleability, ductility, conductivity, hardness, melting/freezing/boiling point, density, viscosity, buoyancy Extensive (depends on amount): EX: mass, volume, length PHYSICAL CHANGES – do not change a substance’s identity at an atomic level. Can be reversed with a physical change. Examples: breaking, tearing, crushing, smashing, cutting, melting, freezing, boiling, evaporation, condensation, dissolving into a solution, mixing together, wetting, drying, painting Examples: rust, decomposing, going sour/rancid, rotting, tarnishing, oxidation, burning, combustibility, flammability, toxicity, electronegativity, reactivity with other substances, pH, corrosiveness CHEMICAL CHANGES – alter the substance’s identity at an atomic level. Can’t be reversed with a physical change. Examples: burning, dissolving something in an acid, letting iron rust, letting silver tarnish, mixing vinegar and baking soda, cooking an egg Also called a CHEMICAL REACTION (5 signs to watch for) formation of an odor, change in temp, formation of a precipitate, change in color, formation of gas