Chemistry Unit 1

Stuff I should know for OCR Unit 1 Chemistry AS Level

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Definitions Questions

Isotopes

Ion

Relative atomic mass

Mole

Molar mass

Empirical formula

Molar volume

Stoichiometry

Acid and Base

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Definitions Answers

Same no. of protons and electrons, but diff. no. of neutrons

Postively or negatively charged atom/group

Weighted mean mass of an atom compared to the mass of 1/12th of carbon-12

Amount of substance containing the same number of atoms as 12g of carbon-12

Mass per mol of substance

Simplest whole number ratio of atoms present in a compound

Volumer per mole of gas (24dm-3)

Molar relationship between relative quantities of a substance in a reaction

Acid = proton donor                         Base = proton reciever

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Bond Angles

Trigonal planar (http://www.caslab.com/Chemical-Search/Chemical-Structure/7787-71-5.gif)= 120 degrees

Tetrahedral         (http://www.chem.ucla.edu/harding/IGOC/B/bond_angle_methane.jpg)= 109.5 degrees

Octahedral        (http://www.elkadot.com/en/atomic/Covalent_Bond_files/image010.gif)= 90 degrees

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Bond Angles

Pyramidal      (http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Ammonia-2D-flat.png/120px-Ammonia-2D-flat.png) = 107 degrees

Non-linear / Bent    (http://www.chem.ucla.edu/harding/IGOC/B/bond_angle_water.jpg) = 104.5 degrees

Linear          (http://learning.covcollege.ac.uk/content/Jorum/CHB_Molecule-shape-and-polarity_LM-1.2-04FEB08/files/asset12.gif) = 180 degrees

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Comments

Panda

Awsome :-) Thanks

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