chem

Question 1

it tells
how many molecular weights of solute are dissolved in
each “Liter” of solution

Answer 1

) Molar (M)

Question 2

In the clinical laboratory, “water” always refers to

Answer 2

distilled water

Question 3

contains more than the maximum amount
of solute that can be dissolved at that temperature

Answer 3

Supersaturated Solution

Question 4

how much solute is dissolved
in one hundred parts (usually 100 ml) of the solution

Answer 4

Percent solutions

Question 5

s a homogeneous part of a system separated
from other parts by physical boundaries.

Answer 5

Phase

Question 6

material containing two or more substances

Answer 6

Mixture

Question 7

the molecules or ions are so small (less
than 1 nm) that they cannot be seen and will remain
dispersed in the liquid

Answer 7

a true solution

Question 8

When water is the solvent we say it is an

Answer 8

aqueous solution

Question 9

Particular kind of matter with fixed
composition ,may be present in different states or phases

Answer 9

Substance

Question 10

the solvents has only a small quantity of solute
dissolved in it

Answer 10

Dilute solution

Question 11

The dissolving substance

Answer 11

solvent

Question 12

………………… gives a liquid fluidity and causes it to take……………… in which it is stored.

Answer 12

Particle mobility, the shape of the container

Question 13

it tells how many
equivalent weights of solute are dissolved in a “Liter” of
solution.

Answer 13

Normal (N)

Question 14

The solvent has a large quantity of solute
dissolved in it

Answer 14

Concentrated solution

Question 15

discrete, tiny, fundamental particles

Answer 15

atoms

Question 16

The substance being dissolved in the solvent

Answer 16

solute

Question 17

is anything that has mass and occupies space.

Answer 17

matter

Question 18

This tells how many molecular weights of solute per Kg of
solvent.

Answer 18

Molal ( m )

Question 19

It is a homogenous mixture of two or more substances

Answer 19

Solution

Question 20

contains the maximum amount of solute that will
dissolve at that temperature.

Answer 20

Saturated solution

Question 21

The elements were first arranged in this way in 1869 by ……………………, a Russian scientist.

Answer 21

Dimitri
Mendeleev

Question 22

each box there is the symbol for the element
and, above it, a number called the

Answer 22

atomic number.

Question 23

The elements in the modern periodic table are arranged in
order of increasing …………………

Answer 23

atomic number.

Question 24

atoms of an element must be capable of
having ………….numbers of
neutrons

Answer 24

varying

Question 25

electrons enter orbitals of equal energy singly with the same spin before they become paired

Answer 25

Hund's rule

Question 26

Two atoms with the same atomic number but different atomic weights will be

Answer 26

isotopes

Question 27

 It shows all the chemical elements and contains a great deal of useful information about them

Answer 27

periodic table

Question 28

there are three kinds of hydrogen atoms

Answer 28

hydrogen deuterium tritium

Question 29

l. The arrows denote the property of .............

Answer 29

spin

Question 30

the .............. forces will attempt to keep each electrons as close to the nucleus as possible.  there is a .................force operating between the two like charged ( - ) electrons.

Answer 30

attractive, repulsive

Question 31

why atoms have more empty spaces

Answer 31

Because of the spaces between electrons and the nucleus

Question 32

 A number is given below the symbol of the element.

Answer 32

atomic weight (atomic mass)

Question 33

is the body of matter under consideration.

Answer 33

System

Question 34

Mendeleev arranged the elements in this way because of .......................of various “families” of elements.

Answer 34

similarities in the chemical properties

Question 35

Mendeleev and Meyer arranged the elements in order of increasing atomic number.............. from left to right and so that the elements that reacted similarly were in the same ..................,

Answer 35

horizontally, vertical columns

Question 36

Mendeleev predicted the existence of undiscovered elements based on the observation of ......................

Answer 36

periodicity

Question 37

the metals shown in the center of the periodic table. the inner levels are not always completely filled, they are

Answer 37

transition metals non representative B Group elements.

Question 38

Elements of similar properties are repeated ................

Answer 38

periodically

Question 39

Electrons in the outermost level

Answer 39

valence

Question 40

specific patterns that are present in the periodic table illustrating different properties of elements.

Answer 40

Trends

Question 41

the amount of energy needed to remove one electron from each of the atoms in a gaseous sample.

Answer 41

Ionization energy

Question 42

It is the radius of the atom (distance between the center of nucleus and the outermost energy level electrons)

Answer 42

Atomic size

Question 43

Relation between Ionization energy and atomic size is....................

Answer 43

inversely

Question 44

: It is the ability of an atom to attract bonding pair of electrons.

Answer 44

Electronegativity

Question 45

teasures the difference in electronegativity between two atoms bonded with covalent bond.

Answer 45

Dipole Moments

Question 46

substance changes in appearance but remains the same substance (by applying or removing heat)

Answer 46

Physical change:

Question 47

A change that produces a new substance

Answer 47

Chemical change

Question 48

s the force that holds elements together in compounds.

Answer 48

Chemical bond:

Question 49

Other elements strive to achieve eight valence electrons

Answer 49

rule of octet rule eigh

Question 50

gaining electrons

Answer 50

reduction

Question 51

losing electrons

Answer 51

oxidation

Question 52

Energy and matter cannot be created or destroyed, they can only be transformed or changed from one form to another.

Answer 52

Law of conservation of energy and matte

Question 53

Ionic compounds form through....................

Answer 53

electron transfer

Question 54

Simple ions are also called ............................

Answer 54

monoatomic ions,

Question 55

Ionic compounds are so named

Answer 55

because they are combinations of ions.

Question 56

a charged species made from many atoms.

Answer 56

polyatomic ion

Question 57

hen two or more nonmetals combine to form a molecule, no electron transfer takes place

Answer 57

COVALENT BOND

Question 58

Certain elements (e.g. H2, O2, N2 and halogens) exist as............................... rather than individual atoms by sharing their electrons in order to achieve a noble-gas configuration

Answer 58

diatomic molecules

Question 59

The valence electrons not involved in bonding

Answer 59

nonbonding electrons or unshared pairs

Question 60

The bond formed when two electrons occupy such a molecular orbital is known as

Answer 60

Sigma bond