Fundamentals of Chemistry - · PDF file5 The scientific method is a systematic approach to...
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Lesson 1
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Fundamentals of Chemistry
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Prof. Roberto Paolesse
Dept. of Chemical Science and Technologies University of Rome "Tor Vergata" Via della Ricerca Scientifica 00133 Rome, Italy
Phone: 39.06.72594752 Fax: 39.06.72594328 e-mail: [email protected]
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Textbook: Raymond Chang:
General Chemistry: the essential concepts
6th edition ; ISBN 0071313680
McGraw-Hill Ed.
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The Study of Chemistry Macroscopic Microscopic
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The scientific method is a systematic approach to research
A hypothesis is a tentative explanation for a set of observations
tested modified
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A theory is a unifying principle that explains a body of facts and/or those laws that are based on them.
A law is a concise statement of a relationship between phenomena that is always the same under the same conditions.
Atomic Theory
Force = mass x acceleration
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Matter is anything that occupies space and has mass.
A substance is a form of matter that has a definite composition and distinct properties.
Chemistry is the study of matter and the changes it undergoes
liquid nitrogen gold ingots silicon crystals
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A mixture is a combination of two or more substances in which the substances retain their distinct identities.
1. Homogenous mixture – composition of the mixture is the same throughout.
2. Heterogeneous mixture – composition is not uniform throughout.
soft drink, milk, solder
cement, iron filings in sand
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Physical means can be used to separate a mixture into its pure components.
magnet
distillation
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An element is a substance that cannot be separated into simpler substances by chemical means.
• 117 elements have been identified
• 82 elements occur naturally on Earth
gold, aluminum, lead, oxygen, carbon, sulfur
• 35 elements have been created by scientists
technetium, americium, seaborgium
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A compound is a substance composed of atoms of two or more elements chemically united in fixed proportions.
Compounds can only be separated into their pure components (elements) by chemical means.
lithium fluoride quartz dry ice – carbon dioxide
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Classifications of Matter
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Dalton’s Atomic Theory (1808)
1. Elements are composed of extremely small particles called atoms.
2. All atoms of a given element are identical, having the same size, mass and chemical properties. The atoms of
one element are different from the atoms of all other elements.
3. Compounds are composed of atoms of more than one element. In any compound, the ratio of the numbers of atoms of any two of the elements present is either an
integer or a simple fraction.
4. A chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not
result in their creation or destruction.
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8 X2Y 16 X 8 Y +
Law of Conservation of Mass
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J.J. Thomson, measured mass/charge of e-
(1906 Nobel Prize in Physics)
Cathode Ray Tube
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Cathode Ray Tube
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e- charge = -1.60 x 10-19 C
Thomson’s charge/mass of e- = -1.76 x 108 C/g
e- mass = 9.10 x 10-28 g
Measured mass of e- (1923 Nobel Prize in Physics)
Millikan’s Experiment
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(uranium compound)
Types of Radioactivity
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Thomson’s Model
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1. atoms positive charge is concentrated in the nucleus 2. proton (p) has opposite (+) charge of electron (-) 3. mass of p is 1840 x mass of e- (1.67 x 10-24 g)
α particle velocity ~ 1.4 x 107 m/s (~5% speed of light)
(1908 Nobel Prize in Chemistry)
Rutherford’s Experiment
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atomic radius ~ 100 pm = 1 x 10-10 m
nuclear radius ~ 5 x 10-3 pm = 5 x 10-15 m
Rutherford’s Model of the Atom
“If the atom is the Houston Astrodome, then the nucleus is a marble on the 50-
yard line.”
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Chadwick’s Experiment (1932) (1935 Noble Prize in Physics)
H atoms - 1 p; He atoms - 2 p
mass He/mass H should = 2
measured mass He/mass H = 4
α + 9Be 1n + 12C + energy
neutron (n) is neutral (charge = 0)
n mass ~ p mass = 1.67 x 10-24 g
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mass p ≈ mass n ≈ 1840 x mass e-
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Properties of Waves
Wavelength (λ) is the distance between identical points on successive waves.
Amplitude is the vertical distance from the midline of a wave to the peak or trough.
Frequency (ν) is the number of waves that pass through a particular point in 1 second (Hz = 1 cycle/s).
The speed (u) of the wave = λ x ν
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Maxwell (1873), proposed that visible light consists of electromagnetic waves.
Electromagnetic radiation is the emission
and transmission of energy in the form of
electromagnetic waves.
Speed of light (c) in vacuum = 3.00 x 108 m/s
All electromagnetic radiation λ x ν = c
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Mystery #1, “Heated Solids Problem” Solved by Planck in 1900
Energy (light) is emitted or absorbed in discrete units
(quantum).
E = h x ν Planck’s constant (h)
h = 6.63 x 10-34 J•s
When solids are heated, they emit electromagnetic radiation over a wide range of wavelengths.
Radiant energy emitted by an object at a certain temperature depends on its wavelength.
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Light has both: 1. wave nature
2. particle nature
hν = KE + W
Mystery #2, “Photoelectric Effect” Solved by Einstein in 1905
Photon is a “particle” of light
KE = hν - W
hν
KE e-
where W is the work function and depends how strongly electrons
are held in the metal
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Line Emission Spectrum of Hydrogen Atoms
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Il modello di Bohr
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1. e- can only have specific (quantized) energy
values
2. light is emitted as e- moves from one energy level to a lower energy
level
Bohr’s Model of the Atom (1913)
En = -RH ( ) 1 n2
n (principal quantum number) = 1,2,3,…
RH (Rydberg constant) = 2.18 x 10-18J
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E = hν
E = hν
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Ephoton = ΔE = Ef - Ei
Ef = -RH ( ) 1 n2 f
Ei = -RH ( ) 1 n2 i
i f ΔE = RH ( ) 1
n2 1 n2
nf = 1
ni = 2
nf = 1
ni = 3
nf = 2
ni = 3
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De Broglie (1924) reasoned that e- is both particle and
wave.
Why is e- energy quantized?
u = velocity of e-
m = mass of e-
2πr = nλ λ = h mu
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Schrodinger Wave Equation In 1926 Schrodinger wrote an equation that
described both the particle and wave nature of the e-
Wave function (ψ) describes:
1 . energy of e- with a given ψ
2 . probability of finding e- in a volume of space
Schrodinger’s equation can only be solved exactly for the hydrogen atom. Must approximate its
solution for multi-electron systems.
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Schrodinger Wave Equation ψ is a function of four numbers called
quantum numbers (n, l, ml, ms)
principal quantum number n
n = 1, 2, 3, 4, ….
n=1 n=2 n=3
distance of e- from the nucleus
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Where 90% of the e- density is found for the 1s orbital
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quantum numbers: (n, l, ml, ms)
angular momentum quantum number l
for a given value of n, l = 0, 1, 2, 3, … n-1
n = 1, l = 0 n = 2, l = 0 or 1
n = 3, l = 0, 1, or 2
Shape of the “volume” of space that the e- occupies
l = 0 s orbital l = 1 p orbital l = 2 d orbital l = 3 f orbital
Schrodinger Wave Equation
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l = 0 (s orbitals)
l = 1 (p orbitals)
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l = 2 (d orbitals)
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quantum numbers: (n, l, ml, ms)
magnetic quantum number ml
for a given value of l ml = -l, …., 0, …. +l
orientation of the orbital in space
if l = 1 (p orbital), ml = -1, 0, or 1 if l = 2 (d orbital), ml = -2, -1, 0, 1, or 2
Schrodinger Wave Equation
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ml = -1, 0, or 1
3 orientations is space
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ml = -2, -1, 0, 1, or 2 5 orientations is space
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(n, l, ml, ms)
spin quantum number ms
ms = +½ or -½
Schrodinger Wave Equation
ms = -½ ms = +½
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Existence (and energy) of electron in atom is described by its unique wave function ψ.
Pauli exclusion principle - no two electrons in an atom can have the same four quantum numbers.
Schrodinger Wave Equation quantum numbers: (n, l, ml, ms)
Each seat is uniquely identified (E, R12, S8) Each seat can hold only one individual at a
time
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Schrodinger Wave Equation quantum numbers: (n, l, ml, ms)
Shell – electrons with the same value of n
Subshell – electrons with the same values of n and l
Orbital – electrons with the same values of n, l, and ml
How many electrons can an orbital hold?
If n, l, and ml are fixed, then ms = ½ or - ½
ψ = (n, l, ml, ½) or ψ = (n, l, ml, -½) An orbital can hold 2 electrons
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How many 2p orbitals are there in an atom?
2p
n=2
l = 1
If l = 1, then ml = -1, 0, or +1
3 orbitals
How many electrons can be placed in the 3d subshell?
3d
n=3
l = 2
If l = 2, then ml = -2, -1, 0, +1, or +2
5 orbitals which can hold a total of 10 e-
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Energy of orbitals in a single electron atom
Energy only depends on principal quantum number n
En = -RH ( ) 1 n2
n=1
n=2
n=3
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Energy of orbitals in a multi-electron atom
Energy depends on n and l
n=1 l = 0
n=2 l = 0 n=2 l = 1
n=3 l = 0 n=3 l = 1
n=3 l = 2
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“Fill up” electrons in lowest energy orbitals (Aufbau principle)
H 1 electron
H 1s1
He 2 electrons He 1s2
Li 3 electrons Li 1s22s1 Be 4 electrons Be 1s22s2 B 5 electrons B 1s22s22p1
? ?
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The most stable arrangement of electrons in subshells is the one with the greatest number of
parallel spins (Hund’s rule).
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Order of orbitals (filling) in multi-electron atom
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s
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Electron configuration is how the electrons are distributed among the various atomic orbitals in an
atom.
1s1 principal quantum
number n angular momentum quantum number l
number of electrons in the orbital or subshell
Orbital diagram
H
1s1
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What is the electron configuration of Mg?
Mg 12 electrons
1s < 2s < 2p < 3s < 3p < 4s
1s22s22p63s2 2 + 2 + 6 + 2 = 12 electrons
Abbreviated as [Ne]3s2 [Ne] 1s22s22p6
What are the possible quantum numbers for the last (outermost) electron in Cl?
Cl 17 electrons 1s < 2s < 2p < 3s < 3p < 4s
1s22s22p63s23p5 2 + 2 + 6 + 2 + 5 = 17 electrons Last electron added to 3p orbital
n = 3 l = 1 ml = -1, 0, or +1 ms = ½ or -½
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Outermost subshell being filled with electrons
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Paramagnetic unpaired electrons
2p
Diamagnetic all electrons paired
2p