Date post: | 21-Jan-2015 |
Category: |
Sports |
Upload: | duluth-middle |
View: | 1,195 times |
Download: | 3 times |
Ch. 4 – Elements, Compounds, and Mixtures
II. Composition of Matter
(p. 80 – 98)Matter Flowchart
Pure Substances
Mixtures
MATTER
A. Matter Flowchart
MATTER
Can it be separated by physical means?
Homogeneous Mixture
(solution)
Heterogeneous Mixture Compound Element
MIXTURE PURE SUBSTANCE
yes no
Can it be decomposed by chemical means?
noyesIs the composition uniform?
noyes
B. Pure Substances
Element matter composed of identical atoms EX: copper
Elements:
Element: A pure substance that cannot be separated into simpler substances by physical or chemical means.
Pure substance: a substance in which there is only one type of particle (atom). (there is only one type of particle in it)
Every particle in a 5g nugget of gold is like every other particle of gold.
Every element has Characteristic Properties:
Characteristic Properties do not depend on the amount of material present.
Physical Properties: Boiling pt., melting pt., density, color, hardness, texture
Chemical Properties: reactivity, flamability
How do you identify an element?
Look on a periodic table (see your agenda on page 117)
Use the physical properties: color, hardness, texture, etc.
Use chemical properties: reactivity, flammability/combustibility
Elements are divided into 3 categories:
Elements
Metals Nonmetals Metalloids
Examples of Elements
B. Pure Substances
Compound matter composed of 2 or
more elements in a fixed ratio that have been chemically combined
properties differ from those of individual elements
EX: salt (NaCl)
Examples of Compounds
Marriage
Divorce
Forming of a bond is like marriage
•More stable
•exothermic
The breaking of a bond relates to a
divorce.
•Less stable
•Endothermic
Bonds
Bonds Between Atoms
Covalent
Ionic
Polyatomic Ions
Metallic
Ionic Bonds
•What is an Ionic Bond?- An Ionic Bond is a chemical bond resulting from the TRANSFER of electrons from one bonding atom to another
• When is an ionic bond formed?- An ionic bond is formed when a cation (positive ion) transfers electrons to an anion (negative ion).
Covalent Bonds•What is an Covalent Bond?
- A covalent bond is a chemical bond resulting from SHARING of electrons between 2 bonding atoms.
• What forms a covalent bond?- A covalent bond is formed between two nonmetals.
Metallic Bonding
What is a Metallic Bond?
- A metallic bond occurs in metals. A metal consists of positive ions surrounded by a “sea” of mobile electrons.
Name 4 Characteristics of a Metallic Bond.
1. Good conductors of heat and electricity
2. Great strength
3. Malleable and Ductile
4. LusterThis shows what a metallic bond might look like.
Polyatomic Bonds
What is a Polyatomic Bond?
- A polyatomic bond is charged group of covalently bonded atoms. It is made up of more than one atom.
Polyatomic ions usually have a charge because the collection of atoms has either gained an extra electron or else it has lost an electron.
Anion- negative ion Cation-positive ion Octet Rule- rule that states that atoms tend to
gain, lose, or share electrons so that each atom has full outermost energy level which is typically 8 electrons.
Polyatomic Ion- charged group of covalently bound atoms
Monatomic Ion- ion formed from a single atom Molecule-neutral group of atoms united by
covalent bonds
II. Balancing Equations
A. Balancing Steps1. Write the unbalanced equation.
2. Count atoms on each side.
3. Add coefficients to make #s equal.
Coefficient subscript = # atoms
4. Reduce coefficients to lowest possible ratio, if necessary.
5. Double check atom balance!!!
1 1
1 1
2 3
2 2
3
6 6
3
2 3 3 2 3 2 Al + CuCl2 Cu + AlCl3
Al
Cu
Cl
2 3 2
B. Balancing ExampleAluminum and copper(II) chloride form
copper and aluminum chloride.
Practice Balancing Equations
1. H2 + O2 ---> H2O
2. N2 + H2 ---> NH3
3. S8 + O2 ---> SO3
4. N2 + O2 ---> N2O
5. HgO ---> Hg + O2
C. Balanicing Equestions
Phases are often shown as: (s) solid, (l) for liquid, and (g) gas. Compounds that dissolved in water are designated as (aq) for aqueous.
C(s) + O2 (g) CO2 (g)
Mixtures
2 or more substances mixed together but not chemically combined
Properties of Mixtures
Each substance keeps it original properties.
Some physical properties may change appearance but the chemical properties stay the same.
The amounts of substances can change. They do not have to stay the same.
Mixtures can be separated easily through physical means.
Separation of Mixtures
Distillation: separates mixtures based on boiling points
Magnetism: separates mixtures by attracting the iron
Centrifuge: separates mixtures according to densities
Filtration: separate a solid from a liquid
Examples of Separation
C. Types of Mixtures
Homogeneous Mixture (Solution) even distribution of components very small particles particles never settle EX: saline solution
C. Mixtures
Heterogeneous Mixture uneven distribution of components colloids and suspensions EX: granite
C. Mixtures
Colloid medium-sized particles Tyndall effect - particles
scatter light (looks cloudy) particles never settle EX: milk
C. Mixtures
Suspension large particles particles scatter light particles will settle
(needs to be shaken) EX: fresh-squeezed
lemonade
Solutions: This is a type of homogeneous mixture but the particles do dissolve.
Solute: the substance that is dissolvedSolvent: the substance that does the dissolving (universal solvent: water)Solution: the final productSolubility: If the substance dissolves then it is soluble. If the substance does not dissolve it is insoluble.Alloys: This is a solid solution. Metals are a good example of alloys.
Examples of Mixtures