Chem 120 Profile: (2010-2014)
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Chem 120 Profile: (2010-2014)
2010 2012 2013
% % %
1. Biology or Related: MCB, Genteics, Pre-med, etc. 35.7 41.1 41.7
2. Nutrition/ Dietetics 1.8 1.8 8.3
3. Biochemistry 3.6 8.9 13.3
4. Physical Therapy / Sports or Personal Training 8.9 8.9 1.7
5. Pharmacy 7.1 7.1 6.7
6. Engineering 28.6 16.1 26.7
7. Chemistry 7.1 5.4 0.0
8. Physical Science: Physics or Geology or Astronomy 5.4 1.8 0.0
9. Environmental Science 1.8 1.8 0.0
10. Other 5.4 7.1 1.7
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Scientific & Chemical Fundamentals
Dr. Ron Rusay
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Scientific & Chemical Fundamentals
Chemistry & the Scientific Method Matter : Classification & Properties Mathematics / Arithmetic:
Exponents, Significant Figures
Measurement & Units: (SI & metric) Conversions and Relationships:
Dimensional Analysis: Density, Percent VOCABULARY: Key Terms, Bold Style Learning
1
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Background Reading
Chemical Foundations
1.1: Chemical Foundations1.2: The Scientific Method 1.3: Units and Measurements 1.4: Measurement Uncertainty 1.5: Significant Figures and Rounding 1.6: Systematically Solving Problems1.7: Unit Conversions 1.8: Temperature1.9: Density 1.10: Classification of Matter (Separations)
http://chemconnections.org/general/chem120/zumdahl.9e-int.html
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Science & The Science & The Scientific Method Scientific Method
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The LAW of Gravity?
New York Times, July 12, 2010http://www.nytimes.com/2010/07/13/science/13gravity.html?_r=1&ref=space
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Law vs. Theory
A New Explanation of Gravity
The Case of Gravity
Law(s)? vs. TheorySpinoza Prize €2.5 x 106
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QUESTIONThe difference between a scientific law and a scientific theory can, at times, be confusing. For example, we will refer to the “Atomic theory” or perhaps the “Law of Gravity.” Should the Law of Gravity be changed to the Theory of Gravity?
A. Yes, no one can see gravity, it is better described as a theory.B. No, scientific laws are based on summaries of many observations and gravity observations are well known and predictable.C. Yes, gravity is better described as a theory because gravity
explains why masses attract each other and theories are about explaining observations.
D. No, keep it as a law, laws offer explanations and gravity explains why masses attract each other and laws are about explaining observations.
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AnswerThe difference between a scientific law and a scientific theory can, at times, be confusing. For example, we will refer to the “Atomic theory” or perhaps the “Law of Gravity.” Should the Law of Gravity be changed to the Theory of Gravity?
A. Yes, no one can see gravity, it is better described as a theory.B. No, scientific laws are based on summaries of many
observations and gravity observations are well known and predictable.C. Yes, gravity is better described as a theory because gravity
explains why masses attract each other and theories are about explaining observations.
D. No, keep it as a law, laws offer explanations and gravity explains why masses attract each other and laws are about explaining observations.
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Some Possible Steps in the Scientific Method
1.1. Observations Observations (Measurement: See Tomorrow’s Lab)(Measurement: See Tomorrow’s Lab)
• qualitativequalitative• quantitativequantitative
2.2. Formulating hypothesesFormulating hypotheses• possible explanation(s) for the possible explanation(s) for the
observationobservation
3.3. Performing experimentsPerforming experiments• gathering new informationgathering new information• testing whether the hypotheses are testing whether the hypotheses are
validvalid
4.4. Developing a theoryDeveloping a theory5.5. Testing & RefiningTesting & Refining
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Chemistry: The Study of Matter In all of its forms & all of its behaviors Sub-categories (not so distinct any longer)
• Organic: carbon• Inorganic: non-carbon• Organometallic: organic + inorganic• Analytical: what?, how much?, how pure?• Biological / Biochemistry: living organisms• Physical: energy, changes, rates• Nuclear: the nucleus• Environmental: interdisciplinary, eg. Oceanography
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Chemistry & Matter (Chemicals)
How many different chemicals do you think have been reported in the scientific literature?
A) 100,000B) 1,000,000C) 10,000,000D) 100,000,000E) 1,000,000,000
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Chemistry & Matter (Chemicals)
How many different chemicals do you think have been reported in the scientific literature?
A) 100,000B) 1,000,000C) 10,000,000 ? orD) 100,000,000 ?E) 1,000,000,000
CAS Registry : ~12,000 in 1907; ~ 75 million in 2014CAS Registry : ~12,000 in 1907; ~ 75 million in 2014
~ 500 new molecules are added / hr~ 500 new molecules are added / hrhttp://en.wikipedia.org/wiki/List_of_CAS_numbers_by_chemical_compound
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Chemistry & Matter:Properties & States
• Physical vs. Chemical Properties
• Solid (s), Liquid (l), Gas (g)
• Homogeneous vs. Heterogeneous Mixtures
• Organization of atoms/molecules:
atoms/elements molecules/compounds
• Extensive vs. Intensive PropertiesVaries with amount (extensive) or does not vary
with amount (intensive)
Heat of reaction is extensive, density is intensive
1
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QUESTION
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Answer
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Observations of Physical & Chemical Properties
Physical-Chemical Properties Movie
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Which of these are chemical properties of matter?
I) Corrosiveness
II) DensityIII) Flammability
IV) Melting point
A) I and II B) I and III
C) II and IV D) III and IV
QUESTION
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Which of these are chemical properties of matter?
I) Corrosiveness
II) DensityIII) Flammability
IV) Melting point
A) I and II B) I and III
C) II and IV D) III and IV
Answer
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States of Matter
States of Matter Movie
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Matter & EnergyE = mc2
Based on the standard model of cosmology, the total mass/energy of the universe is comprised of 4.9% ordinary (Chem 120) matter, 26.8% dark matter and 68.3% dark energy.[1][2] Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe and 26.8% of the total content of the universe.[3]
Dark matter is matter that is undetectable by emitted or absorbed radiation, but whose presence can be inferred from gravitational effects.
1) Ade, P. A. R.; Aghanim, N.; Armitage-Caplan, C.; et al. (Planck Collaboration) (22 March 2013). "Planck 2013 results. I. Overview of products and scientific results –
Table 9.". Astronomy and Astrophysics (submitted). arXiv:1303.5062. Bibcode:2013arXiv1303.5062P.
2) Francis, Matthew (22 March 2013). "First Planck results: the Universe is still weird and interesting". Arstechnica.
3) "Planck captures portrait of the young Universe, revealing earliest light". University of Cambridge. 21 March 2013. Retrieved 21 March 2013.
http://energy.gov/articles/livestream-our-latest-nobel-prize-winner
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Organization of Matter
leptonsleptons
[up, down, strange, charm, bottom, top][up, down, strange, charm, bottom, top]
muon, muon, tau, tau,
neutrinoneutrino
Classification Classification of Matterof Matter
Quarks (sub-atomic particles): * Protons: composed of two up and one down
quarks (uud) * Neutrons: composed of two down and one up
quarks (ddu)
proton
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proton
Physics“Standard” Model Interactions
The Higgs Boson has no spin, no electric charge, nor color charge, Google:
Classical vs Quantum Theory.
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Which of these atomic and/or molecular views represent pure substances?
A) I and III B) II and IV
C) I, II and IV D) II, III, and IV
I I I I I I I V
QUESTION
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Which of these atomic and/or molecular views represent pure substances?
A) I and III B) II and IV
C) I, II and IV D) II, III, and IV
I I I I I I I V
Answer
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Using Physical & Chemical Properties: Distinguishing a Compound & a Mixture
Mixtures and Compounds Movie
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The effects of a The effects of a magnet on iron: filings magnet on iron: filings in a mixture and atoms in a mixture and atoms in a molecule. in a molecule.
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Types of Mixtures
Mixtures have variable composition of Mixtures have variable composition of two or more components.two or more components.
AA homogeneous mixture homogeneous mixture is a solution is a solution (for example, vinegar: water + acetic acid, or (for example, vinegar: water + acetic acid, or steel & bronze: solid metals)steel & bronze: solid metals)
AA heterogeneous mixture heterogeneous mixture is, to the is, to the naked eye, clearly not uniform (for example, a naked eye, clearly not uniform (for example, a bottle of ranch dressing with two layers: water bottle of ranch dressing with two layers: water + oil, or two solids: iron and sulfur)+ oil, or two solids: iron and sulfur)
Chemical Separations
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Separating Mixtures• : Separates components of a mixture based upon differences in particle size. Examples: a precipitate from a solution, or particles from an air stream.
• Separation based upon differences in solubility of components in a mixture. Ideally the impurities are much more soluble in the solvent than the material being purified.
• Separation based upon differences in volatility (boiling points) of components in a homogeneous mixture. Example: ethanol & H2O
Filtration:
Crystallization:
Distillation:
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Separating Mixtures
• Separation based upon differences in a compound’s solubility between two different solvents, typically immiscible liquids. Examples: ether & H2O, gasoline (hydrocarbons) and water.
• Separation based upon differences a compound’s solubility in a solvent versus a stationary phase. Examples: paper, thin layer (TLC), column, gas-liquid (GC); liquid-liquid: (HPLC), reverse phase.
Extraction:
Chromatography:
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Filtration
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Crystallization
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Closer to actual apparatus
Oil Refining: http://science.howstuffworks.com/oil-refining4.htm
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Paper Chromatography
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Thin Layer Chromatography
Stationary phase: silica or alumina
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Procedure for Column Chromatography
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Element:Element: A substance that cannot be A substance that cannot be broken into simpler substances by broken into simpler substances by chemical means, eg. Fe, Iron or Schemical means, eg. Fe, Iron or S8 8
SulfurSulfur
Compound:Compound: A substance with a constant A substance with a constant composition that can be broken down into composition that can be broken down into elements only by chemical processes,eg. elements only by chemical processes,eg. FeS, Iron (II) sulfideFeS, Iron (II) sulfide
Elements & Compounds
Elements in Song
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Atomic / Molecular VisualizationAtomic Force Microscopy / Molecular Modeling
Experimental / Mathematical
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The red spheres are oxygen and the white/gray are hydrogen.
How many oxygens are there?How many hydrogens are there?
How many oxygens are there?How many hydrogens are there?
6 H2(g) + 3 O2(g) → 6 H2O(l)
Three Balloons
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The electrolysis of water is the reverse of burning (combustion). Which equation best represents the change that takes place when water is electrolyzed?
A) H2O(l) → H2O(g)
B) H2O(g) → H2O(l)
C) 2 H2O(l) → 2 H2(g) + O2(g)
D) 2 H2(g) + O2(g) → 2 H2O(l)
QUESTION
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The electrolysis of water is the reverse of burning (combustion). Which equation best represents the change that takes place when water is electrolyzed?
A) H2O(l) → H2O(g)
B) H2O(g) → H2O(l)
C) 2 H2O(l) → 2 H2(g) + O2(g)
D) 2 H2(g) + O2(g) → 2 H2O(l)
Answer
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How many hydrogens, oxygens, and carbons are there in:ethanol?
ethylene glycol?aspirin?
The red spheres are oxygen, the white/gray are hydrogen, and black carbon.
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QUESTIONIs a cup of coffee a homogeneous solution or a compound? Which of the following agrees with your reasoning?
A. The coffee in the cup is a homogeneous solution because it contains the same components throughout, but there are many compounds dissolved to make coffee.B. The coffee in the cup is a compound because it has a set ratio of
components that make it the same throughout.C. The coffee in the cup is both a compound and a solution.D. It looks the same throughout like a true solution, yet it always
has the same amount of each component.E. The coffee in the cup is a heterogeneous solution not homogeneous because it contains distinct, different
compounds dissolved to make coffee.
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AnswerIs a cup of coffee a homogeneous solution or a compound? Which of the following agrees with your reasoning?
A. The coffee in the cup is a homogeneous solution because it contains the same components throughout, but there are many compounds dissolved to make coffee.B. The coffee in the cup is a compound because it has a set ratio of
components that make it the same throughout.C. The coffee in the cup is both a compound and a solution.D. It looks the same throughout like a true solution, yet it always
has the same amount of each component.E. The coffee in the cup is a heterogeneous solution not homogeneous because it contains distinct, different
compounds dissolved to make coffee.