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Chemistry I
Stage II
Ms. Claudia Barahona
Elements & compounds
in our surroundings
Stage I1
Chemical reactions in our
surroundings
Formative Objective: The student
identifies the chemical name and formula of
elements and compounds present in our
daily lives, to reflect on the effects and
importance of these substances in our
bodies and surroundings.
Elaborated by: QFB. Claudia Barahona
TOPICS
Classification of elements in : metals,
nonmetals and metalloids
Classification of compounds by the number of
elements and chemical function.
Elements present in the human body and
acquisition sources.
The effects and uses of chemical compounds
in our daily lives
Elaborated by: QFB. Claudia Barahona
COMPETENCES
Generic Competences:
4. Listens, interprets, and emits pertinent messages in different situations using mediums, codes and appropriate tools.
Express ideas and concepts through
Identifies the main ideas in a text or an oral speech, and deduce conclusions from them.
5. Develops innovations and proposes solutions from established methods.
Follows directions and procedures objective.
Synthesizes evidences obtained with experimentation to produce
Uses the information and communication technologies to
Disciplinary Competences:
2. The student bases opinions about the impact of science and technology in his daily life assuming ethical considerations.
10. The Student relates the symbolic expressions of a phenomenon of the sight or using scientific instruments or models.
Activity 2.1
Exploring your knowledge
What is an ELEMENT?
o A pure substance
composed of only one
type of atom.
o Cannot be broken
down into another
substance by chemical or
physical means.
Compounds
A pure substance consisting of 2 or more elements chemically combined, in a definite composition that can be broken down into a simpler substance, using chemical methods of separation.
Chemical methods:
◦ Electrolysis
◦ REDOX reactions
◦ Catalysis
Dmitri Mendeleev (1869)
http://www.chem.msu.su/eng/misc/mendeleev/welcome.html
The periodic table
Arrangement of elements by increasing
atomic number
http://www.chem.msu.su/eng/misc/mendeleev/welcome.html
K
Au
P
Sn
Cu Ni
Pb
N
Act 2.1 Q 4
Representative
elements
Transition
Metals
Chemical Symbols
Are one or two-letter abbreviations for the
names of an element.
ONLY THE FIRST LETTER IS CAPITALIZED.
If the symbol has a second letter, it is lowercase
SO THAT WE KNOW WHEN A DIFFERENT
ELEMENT IS INDICATED.
CO Co
CARBON MONOXIDE Cobalt
The symbol of Carbon is C, the symbol of sulfur
S. However the symbol of Cesium is Cs not CS.
Why not?
Origin of some of the elements
name
Most of the chemical symbols use
letters from the current name, some
are derived from their ancient name.
Other elements are named after
planets, mythological figures, colors,
minerals, geographical location and
famous people.
Act 2.1
Part II
Activity 2.2 Acquisition of knowledge
Vocabulary terms
Vocabulary terms
1. Periodic table
2. Period
3. Group or family
4. Chemical symbols
5. Representative elements
6. Transition elements
7. Metals
8. Nonmetals
9. Metalloids
10. Malleable
11. Ductile
12. Element
13. Compound
14. Binary compound
15. Ternary compound
16. Polyatomic compound
17. Acids
18. Bases
19. Oxides
20. Salts
21. Valence electrons
22. Ionic bond
23. Covalent bond
Typical amounts of essential
elements in:
Human
body
Typical amounts of essential
elements in:
Human
body
Typical amounts of essential
elements in:
Planet
Universe
Act 2.2 Part III Element Real case
intoxication
(lethal dose)
Source of acquisition Symptoms First aid in case of
intoxication
Arsenic (As)
Can be administered
through oral via such as
food, drinks, etc.
In adults is estimated to
be 70 to 200 mg or
1 mg/kg/day.
Headaches,
confusion,
severe diarrhea,
drowsiness.
Convulsions.
vomiting, blood
in the urine,
cramping
muscles, hair
loss, stomach
pain, and more
convulsions. The
final result of
arsenic
poisoning is
coma and
death.
Dimercaproland dimer
captosuccinic
acid are chelating
agents that sequester
the arsenic away from
blood proteins.
Act 2.2 Part III
Element Real case
intoxication
(lethal dose)
Source of acquisition Symptoms First aid in case of
intoxication
Chromium (Cr)
Drinking water,
Ranges between 1900
and 3300 µg/kg.
Chromate dye company.
Cr often used to
manufacture, amongst
other things, leather
products, paints, cement,
mortar and anti-
corrosives.
Can lead
to DNA
damage. After it
reaches the
blood stream, it
damages
kidneys, liver
and blood cells,
Hemolysis, rena
l and liver
failure are the
results of these
damages.
Appropriate supportive
measures may include
ventilatory support,
cardiovascular support,
and renal and hepatic
function monitoring.
Check the 7 diatomic molecules
Act 2.2 Part III Element Real case
intoxication
(lethal dose)
Source of acquisition Symptoms First aid in case of
intoxication
Mercury
Consumption of fish is
by far the most
significant source of
ingestion-related
mercury exposure in
humans and animals,
although plants and
livestock also contain
mercury due
to bioconcentration of
mercury from seawater,
freshwater, marine and
lacustrine sediments,
soils.
Sensory
impairment
(vision, hearing,
speech),
disturbed
sensation and a
lack of
coordination.
Damage to the
brain, kidneys
and lungs
Immediate chelation
therapy,
Check the 7 diatomic molecules
The Periodic Table
A map of the building block of matter.
1IA
18VIIIA
11H
1.00797
2IIA
Periodic Table 13IIIA
14IVA
15VA
16VIA
17VIIA
2He
4.0026
23
Li6.939
4Be
9.0122
5B
10.811
6C
12.0112
7N
14.0067
8O
15.9994
9F
18.9984
10Ne
20.179
311
Na22.9898
12Mg24.305
3IIIB
4IVB
5VB
6VIB
7VIIB
8 9VIIIB
10 11IB
12IIB
13Al
26.9815
14Si
28.086
15P
30.9738
16S
32.064
17Cl
35.453
18Ar
39.948
419K
39.102
20Ca40.08
21Sc
44.956
22Ti
47.90
23V
50.942
24Cr
51.996
25Mn
54.9380
26Fe
55.847
27Co
58.9332
28Ni58.71
29Cu63.54
30Zn65.37
31Ga65.37
32Ge72.59
33As
74.9216
34Se78.96
35Br
79.909
36Kr83.80
537
Rb85.47
38Sr87.62
39Y
88.905
40Zr91.22
41Nb
92.906
42Mo95.94
43Tc[99]
44Ru
101.07
45Rh
102.905
46Pd106.4
47Ag
107.870
48Cd
112.40
49In
114.82
50Sn
118.69
51Sb
121.75
52Te
127.60
53I
126.904
54Xe
131.30
655Cs
132.905
56Ba
137.34
57La
138.91
72Hf
178.49
73Ta
180.948
74W
183.85
75Re186.2
76Os190.2
77Ir
192.2
78Pt
195.09
79Au
196.967
80Hg200.59
81Tl
204.37
82Pb
207.19
83Bi
208.980
84Po[210]
85At[210]
86Rn[222]
787Fr[223]
88Ra[226]
89Ac[227]
104Ku[260]
105 106 107 108 109http://www.chemsoc.org/viselements/pages/periodic_table.html
Reading the Periodic Table: Classification
Nonmetals, Metals, Metalloids, Noble gases
Across the Periodic Table Periods: Are arranged horizontally across the
periodic table (rows 1-7) These elements have the same number of valence shells.
1IA
18VIIIA
12
IIA13
IIIA14
IVA15VA
16VIA
17VIIA
2
33
IIIB4
IVB5
VB6
VIB7
VIIB8 9
VIIIB10 11
IB12IIB
4
5
6
7
2nd Period
6th Period
Down the Periodic Table Family: Are arranged vertically down the periodic table (columns or group, 1- 18 or 1-8 A,B)
These elements have the same number electrons in the outer most shells, the valence shell.
1IA
18VIIIA
12
IIA13
IIIA14
IVA15VA
16VIA
17VIIA
2
33
IIIB4
IVB5
VB6
VIB7
VIIB8 9
VIIIB10 11
IB12IIB
4
5
6
7
Alkali Family:
1 e- in the valence shell
Halogen Family:
7 e- in the valence shell
Infamous Families of the Periodic Table
Notable families of the Periodic Table and some important members:
1IA
18VIIIA
12
IIA13
IIIA14
IVA15VA
16VIA
17VIIA
2
33
IIIB4
IVB5
VB6
VIB7
VIIB8 9
VIIIB10 11
IB12IIB
4
5
6
7
Alkali
Alkaline
(earth)
Transition Metals
Noble Gas Halogen
Chalcogens
Classification of Elements
Metals
Metals appear to the left of the dark ziz-zag line
on the periodic table. Most metals are solid at room temperature.
Properties of metals
Metals have
luster. This
means they are
shiny
Properties of metals
Ductile metals can be
drawn into wire.
COPPER
Properties of metals
Malleable
metals can
be hammered
into sheets
ALUMINUM
Properties of metals
Metals have a high melting point. They
are also very dense.
Properties of metals
Conductors
Metals are
good
conductors of electricity and
heat
Properties of metals
A chemical property
of metal is its
reaction with
water and oxygen.
This results in
corrosion and
rust.
Properties of metals
Properties of metals
• Shiny
• Solids at room T° (except Hg)
• Luster
• Good conductors of heat and electricity
• Malleable (sheet)
• Ductile (wires)
• High melting points
• High density
Non-metals
Nonmetals occur to the right of the dark zig-zag on the periodic table. Although Hydrogen is in family 1, it
is also a nonmetal. Many nonmetals are gases at room temperature.
Properties of Non metals
Nonmetals do
not have
luster; they are dull.
Properties of Non-metals
Brittle Nonmetals are
brittle so they
break easily. This means nonmetals ARE NOT ductile or
malleable.
Properties of Non-metals
Nonmetals
have low
density.
Properties of Non-metals
They also have a low melting point. This is why they are poor conductors of
heat and electricity.
Properties of Non-metals
Properties of nonmetals
Nonmetals:
Lacks of luster
Low melting point
Low density
Bad conductors of heat or electricity
Metalloids
Metalloids can be found clustered around the
dark zig-zag line that separates metals and
nonmetals.
Properties of Metalloids
Metalloids (metal-
like) have
properties of both
metals and
nonmetals.
Properties of Metalloids
Metalloids are solids
that can be
shiny or dull.
Properties of Metalloids
They conduct
electricity and
heat better than
nonmetals but not
as well as metals.
Properties of Metalloids
Properties of Metalloids
Metalloids are
malleable and
ductile
Properties of metals, nonmetals and
metalloids Metalloids:
Possess characteristics of both metals and
nonmetals
Semiconductors
Summary
What is a COMPOUND?
o A substance in
which two or
more different
elements are
CHEMICALLY
bonded together.
Types of Compounds
• A compound with 2 different elements
• NaCl – Sodium Chloride Binary
• A compound with 3 different elements
• HClO Hypochlorous Acid Ternary
• A compound with 3 or more elements
• NaHCO3 Sodium Bicarbonate
Polyatomic
Classification of Inorganic
Compounds
INORGANIC
COMPOUND
CLASSIFICATION
ELEMENTS Metal
Non-metals
Metalloids
COMPOUND Salt
Oxide
Base
Acid
Others*
ACIDS
Contain the H+ ion and a non-metal ion or
polyatomic ion in an aqueous (aq) solution
CATION ANION
HCl -> Hydrochloric acid
H2SO4 -> Sulfuric acid
Some characteristics
Taste Sour
Feel May Sting
Litmus Red
Phenolphthalein Colorless
Neutralization Neutralizes bases
Strong acids
6 common strong acids:
• Perchloric acid
HClO4
• Sulfuric acid
H2SO4
• Hydroiodic acid
HI
• Hydrobromic acid
HBr
• Hydrochloric acid
HCl
• Nitric acid
HNO3
BASES
Contain a metal ion and the (OH)- ion in an
aqueous (aq) solution
CATION ANION
Characteristics of bases
Taste Bitter, chalky
Feel Soapy, slippery
Litmus Blue
Phenolphthalein Pink
Neutralization Neutralizes acids
No special naming rules for bases.
Ex. KOH -> potassium hydroxide
Ex. NH4OH -> ammonium hydroxide
OXIDES
Binary compounds that contain a metal or
non metal ion and the O-2 ion, normally in a
solid state (s)
Al2O3 is aluminum oxide ( Ionic M-NM)
CO carbon monoxide (Covalent NM-NM)
SALTS
Contain a metal ion (Not H+) and non-metal ion or
polyatomic ion (NOT (OH)- nor, O-2 )
1. normally in a solid state, (s), or in an aqueous, (aq),
solution
2. SALTS ARE FORMED AFTER THE NEUTRALIZATION
OF AN ACID BY A BASE
Example:
LiF lithium fluoride
MgCr2O7 magnesium dichromate
Pb(ClO3)4 lead (IV) chlorite
CATION ANION
Others
Ionic compounds
Covalent compounds
Ionic compounds
Ions are held together by strong electrical attractions between the opposite charges called ionic bonds. ◦ Cation= Metal
◦ Anion= Nonmetal
The sum of the ionic charges
on the formula is always
zero!!
CATION ANION
Covalent compounds
Forms when atoms of 2 nonmetals share electrons.
Held together by the sharing of electrons called covalent bond.
When 2 or ore atoms share electrons they form a molecule.
CATION ANION
Review
Classify the following compounds based on the number of elements and function.
1. AgOH
2. MgO
3. KOH
4. CaF2
5. Na2CO3
6. Na3PO4
7. CaCO3
8. H2SO4
9. ClO3
10. SO3
11. Fe203
12. Mg(OH)2
13. HNO3
14. PbO2
15. CO2
16. Na2O
17. HBr
Activity 2.4
Check
Elements in their natural state
Simplest kind of pure substance that contains only one
type of matter and cannot be broken down by chemical
methods.
Most of the elements in their natural state are
found as compounds.
Diatomic molecules
7 elements are found as diatomic molecules:
◦ H2, N2, O2, F2, Cl2, Br2 e I2
Elaborated by: QFB. Claudia Barahona
Chemical compounds by
number of
elements
Elaborated by: QFB. Claudia Barahona
Compounds
Two or more elements chemically combined.
Elaborated by: QFB. Claudia Barahona
Number of elements
Compounds can be classified according to
the number of different elements
chemically combined as:
◦ Binary (two elements)
Ex: NaCl, FeS, H2O.
◦ Ternary (Three elements)
Ex: NaOH, HClO4, H2SO4
◦ Polyatomic (four or more)
Ex: NaHCO3, (NH4)2SO4, NaHSO3
Elaborated by: QFB. Claudia Barahona
Classification of compounds by their
function
compounds
Acids Bases Oxides Salts
Elaborated by: QFB. Claudia Barahona
Acids and bases
Lemons
Grapefruits
Vinegar
Sodium hydroxide
Antiacids
Acetic acid
Elaborated by: QFB. Claudia Barahona
Acids
Arrhenius theory: Substance that dissolves in
water and produces hydrogen ions (H+).
Bronsted-Lowry: Proton donor substances.
Elaborated by: QFB. Claudia Barahona
Properties of Acids
Sour taste.
Turns litmus paper indicator red.
Turns phenolphtalein indicator colorless.
Corrode some metals.
Elaborated by: QFB. Claudia Barahona
Bases
Arrhenius theory: Substance that dissolves in
water and produces hydroxide ions (OH-).
Bronsted-Lowry: Proton acceptor substances.
Elaborated by: QFB. Claudia Barahona
Properties of Bases
Bitter taste.
Slippery feel (soaps).
Turns litmus indicator blue.
Turns phenolfphtalein indicator pink.
Elaborated by: QFB. Claudia Barahona
Oxides
Chemical binary compounds with one or
more oxygen atoms combined with another
element.
Elaborated by: QFB. Claudia Barahona
Salts
Ionic compound that contains a metal ion or
NH4+ and a nonmetal or polyatomic ion
other than OH-.
Elaborated by: QFB. Claudia Barahona
Chemical compounds by
type of bond
Elaborated by: QFB. Claudia Barahona
Ionic compounds
Consists of positive ion (metal) and negative ion
(nonmetal).
Metal - Nonmetal
Ions are held together by strong electrical
attractions between the opposite charges called
ionic bonds.
Elaborated by: QFB. Claudia Barahona
Covalent compounds
Forms when atoms of 2 nonmetals share
electrons.
Nonmetal – Nonmetal
Held together by the sharing of electrons called
covalent bond.
When 2 or more atoms share electrons they
form a molecule.
Elaborated by: QFB. Claudia Barahona
Electronegativity
Relative ability of an atom to attract the
share electrons by itself.
In a period, it increases.
In a group it decreases.
Nonmetals, Fluorine 4.0 and oxygen 3.5
have the highest electronegativites.
Metals Cesium and Francium have the
lowest electronegativities.
Elaborated by: QFB. Claudia Barahona
Electronegativity
Increasing electronegativity
Incr
eas
ing
ele
ctro
ne
gati
vity
Representative
elements
Transition
Metals
Elaborated by: QFB. Claudia Barahona
Polarity
• Describes how electrons are shared between
atoms .
• Electrons are not always shared equally
between two bonding atoms.
• One atom might exert more of a force on the
electron than the other, electronegativity.
• The unequal sharing of electrons within a bond
leads to the formation of polarity.
Elaborated by: QFB. Claudia Barahona
Polarity of bonds
Nonpolar covalent bond: Bond between
atoms with identical or very similar
electronegativities.
Elaborated by: QFB. Claudia Barahona
Polarity of bonds
Polar covalent bond: Electrons are shared
unequally.
Elaborated by: QFB. Claudia Barahona
Summary of bonds
Elaborated by: QFB. Claudia Barahona
Topic: Chemical elements and compounds in your body and surroundings
Compound Formula Elements
involved
Classificatio
n by # of E
Classification
by chemical
function
Carbon dioxide CO2 Carbon
Oxygen
Binary Oxide
Hydrochloric acid HCl Hydrogen
Chlorine
Binary Acid
Vinegar (Acetic
acid)
CH3(COOH) Carbon
Hydrogen
Oxygen
Ternary Acid
Table salt
(sodium chloride)
NaCl Sodium
Chlorine
Binary Salt
Elaborated by: QFB. Claudia Barahona
Topic: Chemical elements and compounds in your body and surroundings
Compound Formula Elements
involved
Classificatio
n by # of E
Classification
by chemical
function
Sodium
bicarbonate
NaHCO3 Sodium
Hydrogen
Carbon
Oxygen
Polyatomic Salt
Sodium hydroxide NaOH Sodium
Oxygen
Hydrogen
Ternary Base
Calcium oxide CaO Calcium
Oxygen
Binary Oxide
Nitrogen
monoxide
NO Nitrogen
Oxygen
Binary Oxide
Elaborated by: QFB. Claudia Barahona
1. An ionic compound is a chemical compound in
which ions are held together by the electrostatic
force between oppositely charged ions.
2. An ionic compound is form by a positively charge ion
called a cation, which is always a metal and a
negatively charged ion called a anion which is always
a nonmetal or a polyatomic ion when we have 2
or more nonmetals together with a charge.
Elaborated by: QFB. Claudia Barahona
3. The main difference between ionic and covalent
compounds is that ionic compounds is composed of
a metal bonded to a nonmetal while a covalent
compound is a nonmetal bonded to a nonmetal.
4. In ionic compounds there is a complete
transference of electrons.
5. In covalent compounds electrons are being shared.
Elaborated by: QFB. Claudia Barahona
Compound Classification Compound Classification
BaCl2 Ionic Cl2O covalent
N2O4 Covalent KF Ionic
Elaborated by: QFB. Claudia Barahona
Compounds according to the type of
bond
Elaborated by: QFB. Claudia Barahona
Ionic compounds
Consists of positive ion (metal) and negative ion
(nonmetal).
Ions are held together by strong electrical
attractions between the opposite charges called
ionic bonds.
Elaborated by: QFB. Claudia Barahona
Covalent compounds
Forms when atoms of 2 nonmetals share
electrons.
Held together by the sharing of electrons called
covalent bond.
When 2 or more atoms share electrons they
form a molecule.
Elaborated by: QFB. Claudia Barahona
Metallic bonds
Bonding of atoms in solid metallic
crystals.
A three-dimensional array of positive ions
that remain fixed in the crystal lattice
while loosely held valence electrons move
freely throughuot the crystal.
Sharing a “sea of ve-”.
e- are free to move.
Elaborated by: QFB. Claudia Barahona
Properties
Good conductors of electricity and heat
Insoluble in water
Malleable (sheets)
Ductile (wires)
Shiny
Elaborated by: QFB. Claudia Barahona
END OF STAGE 2