Chpters 1-5

Question 1

A measure of the agreement of replicate measurements

Answer 1

Precision

Question 2

Prediction of the outcome

Answer 2

Sensitivity

Question 3

Degree of doubt in a single measurment

Answer 3

Uncertainty

Question 4

Some materials we use everyday, such as sugar, salt, and water. Or substances that consit of only one kind of matter

Answer 4

Pure substances

Question 5

Contain more than one substance

Answer 5

Mixture

Question 6

Derived from the original use of this method to separate plant pigments into color blends

Answer 6

Chromatography

Question 7

What is the equation for the RF value (Retention Factor)

Answer 7

RF= distance traveled by componet spot/ distance traveled by solvent

Question 8

Ability to interact with a solvent

Answer 8

Affinity

Question 9

Electrons are transfered between two atoms to form ions

Answer 9

Ionic bonds

Question 10

Two electrons are shared between 2 atoms

Answer 10

Covalent bond

Question 11

Bonds between the atoms or ions in the substance

Answer 11

Intramolecular forces

Question 12

Attractive forces between the molecules that are external to the molecule itself

Answer 12

Intermolecular

Question 13

The degree of agreement b/w the true value and measured value

Answer 13

Accuracy

Question 14

Electrons are transfered; ions of opposite charge are attracted to each other to form crystalline solids. These solids exhibt medium yo high melting points. Thyre non conductive in the solid state but dissolve in polar solvents to produce ions that conduct electricity in solution

Answer 14

Ionic

Question 15

Electrongs are shared within the molecule. The predominate intermolecular forces are non-polar interactions which are relatively weak and result in very litttle attraction between molecules. Thy tend to be soft and exhibit very low melting points. Thyre soluable in non polar solvents like hexane, but insoluble in polar solvents like water

Answer 15

Non-polar covalent

Question 16

Electrons are unequally shared, resulting in a slight difference in charge from one atom in the molecule to another. The greater the differences in electronegativity, the more polar the molecule tends to be. Polar intermolecular forces are stronger than non polar so the melting points are low to moderate. Thy tend to be soluble in polar and insoluble in non polar

Answer 16

Polar covalent

Question 17

Electrons tend to be shared equally;unlike molecular compounds all the atoms in these compounds are covalently bonded to adjacent atoms. The intramolecular bonding forces are difficult to break, so these materials tend to be hard exhibit very high melting points, are not soluble in any solvent and are non conductive

Answer 17

Network covalent

Question 18

Does not fit the covalent/ionic scheme. Describes bonding in elemental metals and alloys which positively charged nuclei are suspended in a sea of negative electrons. These substances are not soluble and conduct electricity in the solid state

Answer 18

Metallic

Question 19

Is determined only by the arrangement of bonding electrons around the centeal atom

Answer 19

Molecular geometry

Question 20

Is determined by the total number of electron clouds( bonding pairs or non bonding e- pairs) and how they are arranged accoriding to VSEPR theory to minimize repulsive energies

Answer 20

Electron pair geometry

Question 21

Based on negatively charged electrons will repel from one another and that electron pairs when bonding or non bonding will be oriented around

Answer 21

Vsepr

Question 22

Water molecules are incorporated into the crystal lattice of the compound in such a way that it the water is chemically bound…. Many solids, especially inorganic salts occur natually as…

Answer 22

Hydrates

Question 23

Absorb water from humid air

Answer 23

Dessicant

Question 24

All water has been removed

Answer 24

Anhydrous

Question 25

Some of these materials may spontaneously lose water molecules when placed in contact with dry air

Answer 25

Effluorescence

Question 26

Some solids absorb so much humidity from the air that they start to dissolve in the large quanity of absorbed water

Answer 26

Deliquescence