Chemistry Test 1

What are the two general characteristics that all types of matter possess?

1. has matter 2. occupies space

Classify each of the following as (1) a physical property, (2) a physical change, (3) a chemical property, or (4) a chemical change. a. the process of burning a piece of newspaper b. the fact that metallic copper reacts with chlorine gas c. the process of melting ice d. the fact that metallic gold is a solid at room temperature

a. chemical change b. chemical property c. physical change d. physical property

Classify each of the following changes as physical or chemical. a. A newspaper page turns yellow over time. b. A rubber band breaks. c. A firecracker explodes. d. Dry ice "disappears" over time.

a. chemical change b. physical change c. chemical change d. physical change

Classify each of the following as (1) a physical property, (2) a physical change, (3) a chemical property, or (4) a chemical change. a. the process of decomposing hydrogen peroxide b. the fact that a block of ice can be chipped into smaller pieces c. the process of evaporating a liquid d. the fact that water freezes at 32°F

a. chemical change b. physical property c. physical change d. physical property

Indicate whether each of the following statements describes a physical or a chemical property. a. Silver salts discolor the skin by reacting with skin protein. b. Hemoglobin molecules have a red color. c. Beryllium metal vapor is extremely toxic to humans. d. Aspirin tablets can be pulverized with a hammer.

a. chemical property b. physical property c. chemical property d. physical property

Correctly complete each of the following sentences by placing the word chemical or physical in the blank. a. Bending glass tubing using a hot flame is a ______ technique. b. The grating of a piece of cheese is a ______ procedure. c. The heating of a blue powdered material to produce a white glassy substance and a gas is a ______ process. d. Wool is spun into yarn using ______ means.

a. chemical technique b. physical procedure c. chemical process d. physical means

What physical characteristic is the same for a. liquids and solids b. gases and liquids

a. definite volume b. indefinite shape

Indicate whether each of the following substances does or does not take the shape of its container and also whether it has an indefinite volume. a. Aluminum powder b. Carbon dioxide gas c. Clean air d. Gasoline

a. does not take shape of container, definite volume b. does take shape of its container, indefinite volume c. does take shape of container, indefinite volume d. does take shape of container, definite volume

Indicate whether each of the following substances does or does not take the shape of its container and also whether it has a definite volume. a. Copper wire b. Oxygen gas c. Granulated sugar d. Liquid water

a. does not take shape, definite volume b. does take shape, indefinite volume c. does not take shape, definite volume d. does take shape, definite volume

Classify each of the following statements as true or false. a. All heterogeneous mixtures must contain three or more substances. b. Pure substances cannot have a variable composition. c. Substances maintain their identity in a heterogeneous mixture but not in a homogeneous mixture. d. Pure substances are seldom encountered in the "everyday" world.

a. false b. true c. false d. true

Assign each of the following descriptions of matter to one of the following categories: heterogeneous mixture, homogeneous mixture, or pure substance. a. Two substances present, two phases present b. Two substances present, one phase present c. One substance present, two phases present d. Three substances present, three phases present

a. heterogeneous mixture b. homogeneous mixture c. pure substance d. heterogeneous mixture

Assign each of the following descriptions of matter to one of the following categories: heterogeneous mixture, homogeneous mixture, or pure substance. a. Three substances present, one phase present b. One substance present, three phases present c. One substance present, one phase present d. Two substances present, three phases present

a. homogeneous mixture b. homogeneous mixture c. pure substance d. heterogeneous mixture

What physical characteristic distinguishes a. liquids from solids b. gases from liquids

a. liquids have an indefinite shape, solids has a definite shape b. gases have an indefinite volume, liquids have a definite volume solids: definite shape, definite volume liquids: indefinite shape, definite volume gases: indefinite shape, indefinite volume

Classify each of the following changes as physical or chemical. a. A newspaper is shredded. b. Molten candle wax solidifies in a mold. c. A container of unrefrigerated milk sours. d. Fingernails are trimmed.

a. physical change b. physical change c. chemical change d. physical change

Correctly complete each of the following sentences by placing the word chemical or physical in the blank. a. The freezing over of a pond's surface is a ______ process. b. The crushing of ice to make ice chips is a ______ procedure. c. The destruction of a newspaper by burning it is a ______ process. d. Pulverizing a hard sugar cube using a mallet is a ______ procedure.

a. physical process b. physical process c. chemical process d. physical process

Classify each of the following properties of the metal magnesium as a physical property or a chemical property. a. Solid at room temperature b. Ignites upon heating in air c. Hydrogen gas is produced when it is dissolved in acids d. Has a density of 1.738 g∕cm3 at 20°C

a. physical property b. chemical property c. chemical property d. physical property

Classify each of the following changes as physical or chemical. a. Evaporation of water from a lake b. "Scabbing over" of a skin cut c. Cutting a string into two pieces d. Melting of some candle wax

a. physical property b. chemical property c. physical property d. chemical property

Classify each of the following properties of the metal magnesium as a physical property or a chemical property. a. Silvery-white in color b. Does not react with cold water c. Melts at 651°C d. Finely divided form burns in oxygen with a dazzling white flame

a. physical property b. chemical property c. physical property d. chemical property

Classify each of the following observations about the behavior of a substance as a physical property or chemical property of the substance. a. does not react with oxygen at 50°C b. reacts explosively with oxygen at 425°C c. does not melt when heated to 100°C d. melts at temperatures that exceed 250°C

a. physical property b. chemical property c. physical property d. physical property

Classify each of the following observations about the behavior of a substance as a physical property or chemical property of the substance. a. does not tarnish when exposed to dry air at 25°C b. does tarnish when exposed to moist air at 25°C c. is a liquid at 75°C d. is a solid at 15°C

a. physical property b. chemical property c. physical property d. physical property

Indicate whether each of the following statements describes a physical or a chemical property. a. Diamonds are very hard substances. b. Gold metal does not react with nitric acid. c. Lithium metal is light enough to float on water. d. Mercury is a liquid at room temperature.

a. physical property b. chemical property c. physical property d. physical property

Classify each of the following changes as physical or chemical. a. Crushing a dry leaf b. Hammering a metal into a thin sheet c. Burning your chemistry textbook d. Slicing a ham

a. physical property b. physical property c. chemical property d. physical property

Classify each of the following statements as true or false. a. All homogeneous mixtures must contain at least two substances. b. Heterogeneous mixtures, but not homogeneous mixtures, can have a variable composition. c. Pure substances cannot be separated into other kinds of matter by physical means. d. The number of known pure substances is less than 100,000.

a. true b. true c. true d. false

Classify each of the following as a heterogeneous mixture, homogeneous mixture, or a pure substance. Also indicate how many phases are present, assuming all components are present in the same container. a. Water and dissolved salt b. Water and sand c. Water, ice, and oil d. Water, dissolved sugar, and undissolved sugar

a. two substances, one phase b. two substances, two substances c. two substances, three phases d. two substances, two phases

Classify each of the following as matter or energy (nonmatter). a. Air b. Pizza c. Sound d. Gold

air - matter pizza - matter sound - energy gold - matter

Classify each of the following as matter or energy (nonmatter). a. Silver b. Cake c. Heat d. Water

silver - matter cake - matter heat - energy water - matter

What are the three aspects of matter that are of particular interest to chemists?

solid, liquid, gas