LEC MOD 1

Question 1

anything that occupies space and has mass

Answer 1

Matter

Question 2

Classifications of matter:

Answer 2

Pure Substances

Mixtures

Question 3

A classification of matter that cannot be further purified and has a fixed composition.

Answer 3

Pure substancces

Question 4

a classification of matter that are combination of two or more pure substances

Answer 4

Mixtures

Question 5

Two types of Pure substances:

Answer 5

Elements

Compounds

Question 6

type of pure substances that cannot be subdivided by chemical or physicla means but can be chemically combined

Answer 6

Elements

Question 7

type of pure substance that are simply elements in fixed ratio; composed of two or more elements

Answer 7

Compounds

Question 8

Types of mixtures:

Answer 8

Homogenous- uniform composition

Heterogenous- nonuniform composition

Question 9

How many known elements are currently on IUPAC PTE?

Answer 9

118

90 occur naturally

Question 10

he arranged known elements in order of increasing atomic weight;

Answer 10

Dmitri mendeleev

Question 11

names of elements are derived from:

Answer 11

individuals in atomic sci
geographic loc
planets
mythological sources

Question 12

Elements often encountered by MTs:

Answer 12

Sodium Na
Potassium K
Calcium Ca
Phosphorus P
Iodine I 
Iron Fe

Question 13

regulates the electrical balance in body fluids

Answer 13

Sodium Na

Question 14

• essential for nerve conduction

- regulated electrical balance in body fluids

Answer 14

Potassium K

Question 15

• strengthens bones and teeth

- essential in blood clotting

Answer 15

Calcium Ca

Question 16

• present in nucleic acids DNA RNA

- energy storage and transfer

Answer 16

Phosphorus P

Question 17

-stimulates the production of thyroid hormones

Answer 17

Iodine I

Question 18

essential in some proteins (hemoglobin, myoglobin)

Answer 18

Iron Fe

Question 19

Classification of Elements:

Answer 19

Metals
Non metals
Metalloids

Question 20

A classification of elements that are good conductors of heat and electricity; solid at room temp except for mercury Hg

Answer 20

Metals

Question 21

a classification of elements that are poor conductors of heat and have varying states at room temp

Answer 21

Non metals

Question 22

examples of NM at solid state in room temp

Answer 22

Sulfur

Carbon

Question 23

example of NM that is liquid state in room temp

Answer 23

Bromine

Question 24

examples of non metals in gas state in room temp

Answer 24

Nitrogen

Oxygen

Question 25

a classification of elements that possesses both M and NM proerties

Answer 25

Metalloids

Question 26

Enumerate Metalloids:

Answer 26

``` Boron Arsenic tellurium Astatine Germanium Antimony Silicon ```

Question 27

a dense core that contains protons and neutrons

Answer 27

Nucleus

Question 28

Mass g of subatomic particles:

Answer 28

proton-1.673x10^-24 Neutron- 1.675x10^-24 Electron- 9.109x10^-28

Question 29

mass amu of subatomic particles

Answer 29

proton- 1.0073 amu neutron- 1.0087 amu electron- none

Question 30

standard value of AMU:

Answer 30

1.661x10^-24 g

Question 31

equal to number of protons and electrons

Answer 31

Atomic Number Z

Question 32

equal to sum of protons and neutrons

Answer 32

atomic mass/Mass number A

Question 33

atoms of the same element having a diff number of neutrons

Answer 33

Isotopes

Question 34

3 isotopes of hydrogen:

Answer 34

protium 0 deuterium 1 tritium 2

Question 35

weighted average of naturally occuring isotopes (amu)

Answer 35

atomic weight

Question 36

arrangement of electrons in electron cloud or extranuclear space/region

Answer 36

Electron Configuration

Question 37

regions of space within an electron shell that contains electrons

Answer 37

Electron Subshell

Question 38

electron subshells ans characteristics:

Answer 38

s- spherical p- dumbell d-four lobes f- eight lobes

Question 39

regions of space within an electron subshell

Answer 39

Electron orbitals

Question 40

electrons placed in the outermost shell of the element

Answer 40

Valence Electrons

Question 41

Atomic Size in periodic trend:

Answer 41

size of an atom increases down a column, as the VE is farther from the nucleus size of an atom decreases across a row, as the number of protons in nucleus increases

Question 42

energy needed to remove an electron from neutral atom

Answer 42

Ionization energy

Question 43

Ionization energy rule:

Answer 43

IE decreases down a column, as VE gets farther from nucleus | IE increases across a row, as protons in nucleus increases