What makes a property physical or chemical?List the following as physical or chemical propertiesLight enough to float on waterSilver gray in colorIn the liquid state reacts spontaneously with its glass container, producing a hole in the containerCan be cut with a sharp knifeChanges from silver gray to black when placed in moist airIn the liquid state it boils at 1317 degrees CelsiusReacts violently with Chlorine to form a white solidBurns in oxygen with a bright red flame

In the following description of the element iron, identify which of the properties are chemical and which are physical. Iron is rarely found as the free element in nature. Mostly it is found combined with oxygen in an ore. The metal itself can be obtained by reacting the ore with carbon, producing iron and carbon dioxide. Iron is a silver colored metal that conducts heat and electricity well. It is one of the most structurally important metals because of its hardness and mechanical strength, and it makes alloys with many other metals. Stainless steel is one useful alloy of iron that does not corrode in the presence of water and I oxygen, like pure iron does.

Distinguish precisely and in scientific terms the differences among items in the following groups. a Macroscopic matter, microscopic matter, particulate matter b Physical change, physical property, chemical change, chemical property c Gases, liquids, solids d Element, compound e Atom, molecule f Pure substance, mixture g Homogeneous matter, heterogeneous matter h Reactant, product i Exothermic change, endothermic change j Potential energy, Kinetic energy

Which of the following are elements, and which are compounds? a NaOH; b BaCl2; c He; d Ag; e Fe2O3.

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.

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.

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?

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. Iron is transformed into rust in the presence of air and water. Dynamite can explode. Aluminum metal, the shiny “foil” you use in the kitchen, melts at 660 °C.

Which among the following are physical changes? a blowing glass; b fermenting grapes; c forming a snowflake; d evaporating dry ice; e decomposing a substance by heating it.

Classify each of the following pure substances as either an element or a compound: a C; b C2H5OH; c Cl2.