chemistry chapter 1

which of the following is an extensive property of oxygen

mass

acetic acid boils at 244.2*F. what is its boiling point in degrees celcius a) 382.0*C b) 167.7*C c) 153.4*C d) 117.9*C e) 1037*C

d

select the answer with the correct number of decimal places for the following sum 13.914 cm+243.1 cm+12.00460 cm= A) 269.01860 cm B) 269.0186 cm C) 269.019 cm D) 269.02 cm E) 269.0 cm

e

the appropriate number of significant figures in the result of 15.234 x 15.208 is a) 1 b) 2 c) 3 d) 4 e) 5

e

a dose of medication was prescribed to be 35 microliters. which of the following expresses that volume in centiliters a) 3.5*10^5cl b) 3.5*10^4cl c) 3.5cl d) 3.5*10^-4cl e)3.5*10^-3cl

e

given that 1 inch= 2.54 cm, 1 cm^3 is equal to a) 16.4 in^3 b) 6.45 in^3 c) 0.394 in^3 d) 0.155 in^3 e) 0.0610 in^3

e

the difference between a students experimental measurement of the density of sodium chloride and the known density of this compound reflects the ______ of the students result.

accuracy

select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units 16.18 cm*9.6114 g /1.4783 cm^2= A) 105.2 g/cm3 B) 105.2 g/cm2 C) 105.2 g/cm D) 72.13 g/cm2 E) 72.13 g/cm

c

select the best statement a) chemical changes provide the only valid basis for identification of a substance b) chemical changes are easily reversed by altering the temperature of the system c) chemical changes always produce substances different from the starting materials d) chemical changes are associated primarily with extensive properties e) chemical changes are accompanied by changes in the total mass of the substances involved

c

the averge distance between the earth and the moon is 240,000 miles. express this distance in kilometers a) 6.1*10^5 km b) 5.3*10^5 km c) 3.9*10^5 km d) 1.5*10^5 km e) 9.4*10^4 km

c

the distance between carbon atoms in ethylene is 134 picometers. which of the following expresses that distance in meters a) 1.34*10-13m b) 1.34*10-12m c) 1.34*10-10m d) 1.34*10-7m e) 1.34*10-6m

c

a student makes several measurements of the density of an unknown mineral sample. she then reports the average value of these measurements. the number of significant figures she uses in her result should be a measure of its

precision

the area of a 15 inch pizza is 176.7 in^2. express this area in square centimeters A) 1140. cm2 B) 448.8 cm2 C) 96.8 cm2 D) 69.57 cm2 E) 27.39 cm2

a

the average distance from earth to the sun is 150 megameters. what is that distance in meters a) 1.5*10^8m b) 1.5*10^6m c) 1.5*10^5m d) 1.5*10^3m e) 1.5*10^-6m

a

the density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm^3. what is that density in pounds per cubic inch a) 0.491 lb/in^3 b) 1.83 *10^-3 lb/in^3 c) 376 lb/in^3 d) 849 lb/in^3 e) 491 lb/in^3

a

the result of 3.8621*1.5630-5.98 is properly written as a) 0.06 b) 0.056 c) 0.0565 d) 0.05646 e) 0.056462

a

which of the following correctly expresses 52,030.2 m in scientific notation A) 5.20302 x 10^4 m B) 5.203 x 10^4 m C) 5.2 x 10^4 m D) 5.2 x 10^-4 m

a

the mass of a sample is 550 milligrams. which of the following expresses that mass in kilograms a) 5.5*10^8kg b) 5.5*10^5kg c) 5.5*10^-4kg d) 5.5*10^-6kg e) 5.5*10^-1kg

c

an evacuated 276 ml glass bulb weighs 129.6375 g. filled with an unknown gas, the bulb weighs 130.0318g. calculate the gas density in g/L, and express it with an appropriate number of significant figures

1.43 g/L

which of the following represents the largest volume

100 mL

the Si unit of speed (velocity) is

m/s

a large pizza has a diameter of 15 inches. express the diameter in centimeters A) 38 cm B) 24 cm C) 18 cm D) 9.3 cm E) 5.9 cm

a

at a pressure of one billionth (10^-9) of atmospheric pressure, there are about 2.7*10^10 molecules in one cubic centimeter of a gas. how many molecules is this per cubic meter a) 2.7*10^16 b) 2.7*10^14 c)2.7*10^12 d)2.7*10^8 e)2.7*10^4

a

select the best statement a) physical changes may be reversed by changing the temperature b)physical changes alter the composition of the substances involved c) physical properties are not valid characteristics for identifying a substance d) physical properties are mostly extensive in nature e) physical changes are usually accompanied by chemical change

a

acetone which is used s a solvent and as a reactant in the manufacture of plexiglas, boils at 56.1*C. what is the boiling point in degrees fahrenheit a) 159*F b) 133*F c) 101*F d) 69.0*F e) 43.4*F

b

express 96.342 m using 2 significant figures a) 9.60 x 10^4 m b) 9.6 x 10^4 m c) 9.60 x 10^-4 m d) 9.6 x 10^-4 m e) 96000. m

b

isopropyl alcohol,commonly known as rubbing alcohol, boils at 82.4*C. what is he boiling point in kelvins a) 387.6 k b) 355.6 k c) 323.6 k d) 190.8 k e) -190.8 k

b

talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. it is used as talcum powder and face powder. a sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d=1.75 g/cm^3). what is the density of talc A) 4.61 g/cm3 B) 2.82 g/cm3 C) 2.63 g/cm3 D) 2.44 g/cm3 E) 1.61 g/cm3

b

the speed needed to escape the pull of earths gravity is 11.3 km/s. what is this speed in mi/h a) 65,500 mi/h b) 25,300 mi/h c) 18,200 mi/h d) 1,090 mi/h e) 5.02*10-3 mi/h

b

which of the following is chemical change? A) boiling of water B) melting wax C) broiling a steak on the grill D) condensing water vapor into rainfall E) carving a piece of wood

c

during the swing of frictionless pendulum, what energy forms remain constant A) kinetic energy only B) potential energy only C) both kinetic energy and potential energy D) kinetic plus potential energy E) None of the above forms remains constant.

d

the SI prefix mega-(m) means A) 10^-6. B) 10^-3. C) 10^3. D) 10^6. E) 10^9.

d

which of the following correctly expresses 0.000007913 g in scientific notation a) 7.913 x 10^6 g b) 7.913 x 10^5 g c) 7.913 x 10^-5 g d) 7.913 x 10^-6 g e) 7.913 x 10^-9 g

d

which of the following is not an SI base unit A) meter B) ampere C) second D) gram E) kelvin

d

water vapor is less dense than ice because A) molecules in the gas phase are in constant motion. B) molecules in the gas phase have more potential energy than in solids. C) molecules in the gas phase have more kinetic energy than in solids D) gaseous molecules have less mass. E) molecules in the gas phase have more space between them than in solids

e

a dictionary has the following definition of a word: "a tentative explanation that accounts for a set of facts." which of the following words best fits that definition

hypothesis

a scientist made careful measurements of the pressure and temperature of many different gases. based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." this statement is best described as a

law

a detailed explanation of natural phenomema that is generally accepted and has been extensively tested is called a

theory