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Chem 205 > Chapter 2 > Flashcards

Chapter 2 Flashcards

1
Q

Atomic #=

A

Atomic #= Z (Mass # )= P^+(number of protons)

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2
Q

Charge=

A

Charge=P-e
Protons - electrons

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3
Q

Mass=

A

Mass #= A = protons + neutrons

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4
Q

Notation of an isotope

A

AZE”, notation where A is the mass number, Z is the atomic number, and E is the element symb

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5
Q

In neutral isotopes

A

Electrons are equal to protons

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6
Q

Percent abundance formula

A

(M1)(x) + (M2)(1-x) = M(E)

M1 denotes the mass of one isotope’
x denotes its relative abundance.
The mass of the second isotope is denoted by M2.
M(E) denotes the periodic table element’s atomic mass.

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7
Q

Atomic weight formula

A

(Percent abundance of isotope 1/100)(mass of isotope 1) + (percent abundance of isotope 2/ 100) (mass iso 2)

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8
Q

Ionic compound

A

Metal and non metal or polyatomic ion

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9
Q

Covalent

A

Non mental w non metal

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10
Q

Naming for metals

A

Prefixes and ide ending

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11
Q

Naming for transition metals

A

Roman numerals and ide ending or polyatomic name

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12
Q

Prefixes

A

Mono
Di
Tri
Tetra
Penta
Hexa
Hepta
Octa
Nona
Deca

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13
Q

Metalloids

A

B, Si, As, Te, Ge, Sb

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14
Q

Group 1 is called

A

Alkali metals excluding H

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15
Q

Group 2 is called

A

Alkaline earth metals

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16
Q

Group 17 are

A

Halogens

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17
Q

Group 18

A

are noble gases

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18
Q

Highest reactivity of elements

A

Bottom left (metals are more reactive as we go down)
Top right (non metals are more reactive as we go up)

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19
Q

Elements by ancient Greeks

A

Elements
• ancient Greeks believed there were four: Earth, Fire, Water, Air

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20
Q

Who proposed the concept of atoms

A

Atoms
• Democritus & Leucippos (~400 BC) proposed concept of tiny particles

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21
Q

Alchemy

A

Alchemy
• attempts to transmute “base” metals (i.e., cheap ones) into gold
• went on for about 2000 years without success…
• …but lead to discovery of many elements & chemicals (e.g., mineral acids)

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22
Q

Extraction of metals from minerals

A

Extraction of metals from minerals
• geologist Georg Bauer a.k.a. Georgius Agricola (German 1494 - 1555)

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23
Q

Medicinal use of minerals

A

Medicinal use of minerals
• Philippus Theophrastus) did this & also a lot of synthetic chemistry

24
Q

What did Robert Boyle do? What did he believe?

A

• Robert Boyle (English, 1627 - 1691): among first to “measure” things
• did not believe in Greeks’ four elements
• his idea: an element = a substance that cannot be further broken down
• did not believe metals were elements → : he dabbled in alchemy…

25
Q

Phlogiston: a major scientific dead-end (1667 - mid 1700s)

A

former theory of combustion in which all flammable objects were supposed to contain a substance called phlogiston, which was released when the object burned. phlogiston was presumed to have negative mass!

26
Q

Who is the father of modern chemistry and what did he introduce

A

• Lavoisier = the father of modern chemistry
• introduced systematic terminology & quantitative experimentation
And Law of Conservation of Matter

27
Q

John Dalton’s atomic theory (1803):

A
  1. All matter is made of atoms.
  2. All atoms of an element are identical. ‹ not exactly true…
    3.A given compound always has the same relative #s & types of atoms.
  3. Chemical reactions involve the reorganization of atoms, but the atoms themselves are not changed. except in nuclear reactions.
28
Q

Marie Curie (1876-1934): atoms made of smaller particles

A

Discovered one of the pieces of evidence for the fact that atoms are made up of smaller particles
Radioactivity:
= the spontaneous disintegration of some elements’ accompanied by emission of unusual “rays”

29
Q

J.J. Thomson (1897): electrons in all atoms

A

J.J. Thomson’s experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged “soup.”

30
Q

J J Thompson experiments

A

J.J. Thomson’s cathode ray tube experiment discovered the subatomic particle the electron. Prior to the experiment, it was not known that atoms were composed of further particles. Cathode rays were determined to be composed of negatively charged particles that were smaller than the smallest atom.

31
Q

Robert Millikan

A

In the experiment, Milliken allowed charged tiny oil droplets to pass through a hole into an electric field. By varying the strength of the electric field the charge over an oil droplet was calculated, which always came as an integral value of ‘e. ‘

32
Q

Eugene Goldstein discovered what

A

Eugene Goldstein discovered positive particles by using a tube filled with hydrogen gas (this tube was similar to Thomson’s tube). This resulted in The positive particle had a charge equal and opposite to the electron. The positive particle was named the proton.

33
Q

How do we measure masses & abundances of isotopes?

A

using a mass spectrometer

34
Q

Mass spectrometer how it works

A

Atoms ionized to form CATIONS (= positively charged ions)
- Electric field pulls cations through magnetic field
• Ions are deflected – heavy ions deflect LESS
→ IONS SEPARATED BY MASS

35
Q

Isotopes

A

ISOTOPES = Atoms with same # protons (:: same element)
same # electrons
BUT different # neutrons (:: different mass)

36
Q

Ernest Rutherford (1910): protons in nucleus

A

Ernest Rutherford found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. The nucleus is positively charged and surrounded at a great distance by the negatively charged electrons

37
Q

Describe the gold foil experiment and who created it

A

In 1899 Ernest Rutherford studied the absorption of radioactivity by thin sheets of metal foil and found two components: alpha (a) radiation, which is absorbed by a few thousandths of a centimeter of metal foil, and beta (b) radiation, which can pass through 100 times as much foil before it was absorbed.

38
Q

Metals characteristics

A

conduct heat & electricity
• malleable, ductile, lustrous (shiny)
• exist as atomic SOLIDS
(except for Hg = liquid)

39
Q

Non metals characteristics

A

insulators, non-malleable
• gases, liquids, non-lustrous solids
• many exist as diatomic molecules:
Iz. H2, N2, Brz, 02, Clz, F2
“I have no bright or clever friends…

40
Q

Metalloids characteristics

A

” some properties of both M & NM
Si: shiny but brittle, semiconducting

41
Q

Period is

A

Horizontal

42
Q

Group is

A

Vertical

43
Q

Group 18 (8A) = noble gases: characteristics

A

All exist as free atoms: e.g., Kr(g)
*radioactive
• Lighter-than-air balloons: He(g)
• Neon signs: more in Ch.6
• The most unreactive elements

44
Q

Group 17 (7A) = halogens: characteristics

A

Exist as diatomic molecules: F2(g), Cl(g), Brz(l), I2(s)
• Quite reactive: elemental forms not found in nature
• React violently with alkali metals to form ionic compounds

45
Q

Group 1 (1A) = alkali metals: characteristics

A

Elemental form: soft silvery “atomic” metals, M(s)

All are violently reactive towards water, air &

In nature: found in compounds as M+ cations (never in elemental

46
Q

Group 2(2A)=alkaline earths: characteristics

A

Elemental form:
•quite reactive metals
• In nature: found only in compounds, as M2+ cations e.g. in CaCO, limestone

47
Q

Group 15 pnictogens: characteristics

A

Nitrogen very unreactive

Phosphorus: highly reactive

48
Q

Group 16 (6A) = chalcogens:

A

Oxygen: colourless gas

Sulfur:
• Quite reactive…

49
Q

Family

A

Elements with similar chemical and physical properties VERTICAL

50
Q

Groups

A

Tells us the reactivity and how many valence electrons for 11 and so on look at the last digit

51
Q

Moles formula

A

N= mass in grams/ molar mass (g/mol)

52
Q

Mass percent of an element formula

A

Mass percent=( mass of element asked/ total mass) * 100%

53
Q

Empirical

A

All subscripts at lowest form

54
Q

Molecular

A

All subscripts as is

55
Q

Who disproved phlogiston

A

phlogiston theory disproved once:
• Joseph Priestly (English, 1733 - 1804) discovered oxygen
• Antoine Lavoisier (French, 1743 - 1794) added rigour & explanation

56
Q

Diatomic elements

A

I2, H2, N2, Brz, O2, Cl2, F2
“I have no bright or clever friends…

Chem 205 (14 decks)

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