Test 1 Terminology

Question 1

Aliquot

Answer 1

A small portion, typically of a solution or liquid

Question 2

Analyte

Answer 2

Substance being measured in an analytical procedure

Question 3

Aqueous

Answer 3

A substance dissolved in water

Question 4

Concentration

Answer 4

A measure of the amount of substance present in a unit amount of mixture

Question 5

Heterogeneous

Answer 5

A sample consisting of more than one pure substance and more than one phase. For example, blood consists of cells and plasma

Question 6

Homogeneous

Answer 6

A sample consisting of more than one pure substance with properties that do not vary within the sample

Question 7

Qualitative analysis

Answer 7

A chemical analysis that detects the presence of a substance in a sample

Question 8

Quantitative analysis

Answer 8

A chemical analysis that determines the concentration of a substance in a sample

Question 9

Solution

Answer 9

Is a homogeneous mixture, consisting of a one phase system with more than one component (or species). The phase may be solid, liquid, or gas.

Question 10

Solvent

Answer 10

Most abundant component in a solution

Question 11

Solute

Answer 11

A substance dissolved in a solvent to make a solution. The solute is the minor component in a solution

Question 12

Aqueous solution

Answer 12

Is a solution where water is the solvent

Question 13

Concentration

Answer 13

Refers to how much solute is contained in a given volume or mass

Question 14

Atomic weight (AW)

Answer 14

Is the number of grams containing Avogadro’s number of that elements atom. Expressed in units of g/mol or amu (atomic mass units). Avogadro’s number (N or NA)=6.022x10^23 particles/mole

Question 15

Molecular weight (MW)

Answer 15

Is the sum of the atomic weights of the atoms in the molecule. It is the number of grams containing Avogadro’s number of molecules of the compound. Also expressed in units of g/mol or amu (atomic mass unit)

Question 16

Molarité

Answer 16

Number of moles of a substance in one litre of solution. M=n/v

Question 17

Normality

Answer 17

The number of equivalents of solute per litre of solution (equivalents/L). N=Eq/V

Question 18

Equivalent weight

Answer 18

The weight of substance in grams that will produce one mole of reacting unit. Equivalent weight= molecular mass (g/mol)/reacting units per mol (eq/mol)

Question 19

Molality

Answer 19

The number of moles of a substance per kilogram of solvent (independent of temperature). Molality (m)=moles of substance/1kg of solvent