
Chemistry: The Molecular Science
5th Edition
ISBN: 9781285199047
Author: John W. Moore, Conrad L. Stanitski
Publisher: Cengage Learning
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What makes a property physical or chemical?
List the following as physical or chemical properties
Light enough to float on water
Silver gray in color
In the liquid state reacts spontaneously with its glass container, producing a hole in the container
Can be cut with a sharp knife
Changes from silver gray to black when placed in moist air
In the liquid state it boils at 1317 degrees Celsius
Reacts violently with Chlorine to form a white solid
Burns in oxygen with a bright red flame
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Which of the following describes a chemical property? The density of iron is 7.87 g/cm3. A platinum wire glows red when heated. An iron bar rusts. Aluminum is a silver-colored metal.
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From the information given, classify each of the pure substances A through D as elements or compounds, or indicate that no such classification is possible because of insufficient information. a. Analysis with an elaborate instrument indicates that substance A contains two elements. b. Substance B decomposes upon heating. c. Heating substance C to 1000C causes no change in it. d. Heating substance D to 500C causes it to change from a solid to a liquid.
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Classify each of the following as aphysical or chemicalchange or property. A fireplace poker glows red when you heat it in the fire. A marshmallow turns black when toasted Loo long in a campfire. Hydrogen peroxide dental strips will make your teeth whiter. If you wash your jeans with chlorine bleach, they will fade. If you spill some nail polish remover on your skin, it will evaporate quickly. When making ice cream at home, salt is added Lo lower the temperature of the ice being used to freeze the mixture. A hair clog in your bathroom sink drain can be cleared with drain cleaner. The perfume your boyfriend gave you for your birthday smells like flowers. Mothballs pass directly into the gaseous state in your closet without first melting. A log of wood is chopped up with an axe into smaller pieces of wood. A log of wood is burned in a fireplace.
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1.13 Physical properties may change because of a chemical change. For example, the color of an egg white changes from clear to white because of a chemical change when it is cooked. What is another common situation in which a chemical change also leads to a physical change?
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In each case, identify the italicized property as a physical or chemical property. Give a reason for your choice.
The normal color of the element bromine is red-orange.
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Dynamite can explode.
Aluminum metal, the shiny “foil” you use in the kitchen, melts at 660 °C.
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Classify each of the following pure substances as either an element or a compound: a C; b C2H5OH; c Cl2.
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