chemistry

Question 1

is the measure of composition of a solution

Answer 1

concentration of a solution

Question 2

the amount of solute dissolved in a unit volume of solution is called the

Answer 2

concentration of the solution

Question 3

it can be expressed either qualitatively or quantitatively

Answer 3

concentration of the solution

Question 4

gives an exact concentration of the solution and hence its concentration can be compared with the concentration of other solutions

Answer 4

quantitative description method

Question 5

two broad categories of concentration units

Answer 5

scientific units and industrial units

Question 6

scientific applications

Answer 6

molarity (M), molality (m), mole fraction (X)

Question 7

the identifies of the solvents and solutes are known and are usually pure substances

Answer 7

scientific units

Question 8

the solutes and solvents may be mixtures of materials whose composition is not well defined

Answer 8

industrial units

Question 9

requires the calculation of a number of moles

Answer 9

scientific units

Question 10

are the most common of the scientific concentration units because molar solutions are easy to prepare

Answer 10

molar concentrations

Question 11

is prepared by placing a known quantity of solute in a volumetric flask and adding solvent until the flask is filled to the calibration mark

Answer 11

molar solution

Question 12

is less convenient to use because the mass of the solvent must be determined rather than its volume .

Answer 12

molal concentration

Question 13

are used in experiments determining freezing point depressions, boiling point elevation…

Answer 13

molal concentrations

Question 14

eliminate the problem of the dependence of volume on temperature seen

Answer 14

molal concentrations

Question 15

are the units of both numerator and denominator

Answer 15

moles

Question 16

is a unit less quantity

Answer 16

mole fraction

Question 17

is used to express the concentration of substances that are not pure

Answer 17

mass percent

Question 18

is not a pure substance

Answer 18

butterfat

Question 19

is usually used for very dilute aqueous solutions

Answer 19

parts per million

Question 20

is used to describe concentrations in solutions containing poorly defined or unidentified solutes or mixtures of solutes

Answer 20

parts per million

Question 21

used to describe concentration levels to those who are unfamiliar with the concept of moles

Answer 21

parts per million

Question 22

contains a variety of dissolved impurities, mostly minerals

Answer 22

tap water

Question 23

used for reporting trace contaminants of substances in water supplies and for substances present in extremely small quantities in other systems

Answer 23

parts per billion