chem proj
Subject:
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Chemistry
Forum reference:
Book page:
http://course-notes.org/Chemistry
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AP Chem Math Notes
Subject:
9/20/10 Math of Chemistry Notes: Types of Measurement: ?Quantitative- use numbers to describe ?Qualitative- use description without numbers ?4 feet-Quantitative ?Extra large-Qualitative ?Hot- Qualitative ?100?F- Quantitative **Scientist prefer to use: ?Quantitative- easy check ?Easy to agree upon, no personal bias ?Although the measuring instrument limits how good the measurement is. ?Scientists use two words to describe how good the measurements are ?Accuracy- how close the measurement is to the actual value ?Precision- how well can the measurement be repeated ?Accuracy can be true of an individual measurement or the average of several ?Precision requires several measurements before anything can be said about it SIGFIGS:
Inter/IntraMolecular Forces
Subject:
3 Types of bonds: [IONIC, COVALENT, METALLIC] ---> Intramolecular forces
INTERmolecular Forces: Force of attraction between molecules
Ionic > [Hydrogen Bonding > Dipole-Dipole > LDF] <---Covalent
A. Dipole-Dipole
1. Definition - Positive (Polarity) seeks negative
2. Happens between POLAR molecules
EX: HCl attracts HCl
H-Cl --><-- H-Cl
B. Hydrogen Bonding
1. Definition - Attraction between Hydrogen atoms and unshared electrons of Hydrogen (H), Oxygen (O), or Florine (F).
2. STRONG attraction <---IMPORTANT
3. Holds DNA strands together
EX: H2O attracts H2O (Dipole-Dipole is there too)
HAVE POLARITY
C. London Dispersion Forces (LDF)
Alpha and Beta Particles
Subject:
Alpha and Beta particles can be both emitted and bombarded with other elements. If a beta particle is a emitted then the original element gains a proton. If a Alpha particle is emitted then the original element looses two protons. And vice versa if the particle is bombared.
chame chem
Subject:
Name ____________________________________ Date __________ Class ___________________ Guided Reading and Study Workbook 17 ? Pr en tic e- H al l, In c. SECTION 3.1 THE IMPORTANCE OF MEASUREMENT (pages 51?53) This section explains the difference between qualitative and quantitative measurements, and how scientific notation can help express very large or very small numbers. Qualitative and Quantitative Measurements (page 51) 1. The system of units used for measurements in chemistry is called the ______________________________________________________________ . 2. Is the following statement true or false? A qualitative measurement gives a precise, numerical result. ______________________ 3. Is the following statement true or false? A quantitative measurement gives a
Common Polyatomic Ions
Subject:
Common Polyatomic Ions +1 CHARGE -1 CHARGE -2 CHARGE -3 CHARGE -4 CHARGE ion name ion name ion name ion name ion name NH4+ ammonium H2PO3- dihydrogen phosphite HPO32- hydrogen phosphite PO33- phosphite P2O74- pyrophosphate H3O+ hydronium H2PO4- dihydrogen phosphate HPO42- hydrogen phosphate PO43- phosphate Hg22+ mercury(I) HCO3- hydrogen carbonate CO32- carbonate PO23- hypophosphite HSO3- hydrogen sulfite SO32- sulfite AsO33- arsenite HSO4- hydrogen sulfate SO42- sulfate AsO43- arsenate NO2- nitrite S2O32- thiosulfate NO3- nitrate SiO32- silicate OH- hydroxide C22- carbide CH3COO- acetate C2O42- oxalate CrO2- chromite
Mole Concept
Subject:
Chapter 5: Principles of Chemical Reactivity: Energy and Chemical Reactions
Subject:
5.1 - Energy: Some basic principles
Chemistry Acids and Bases
Subject:
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Electron Orbitals
Subject:
They go around the nucleus.
Pages
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