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MCAT Chemistry
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MCAT Chemistry
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25 Questions

1. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points

2. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12

3. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles

4. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.

5. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules

6. 5 different orbitals shaped like clover leaves and max electrons is 10

7. A pair of equal and opposite electric charges or magnetic poles separated by a small distance

8. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms

9. Sum of the protons and neutrons in an element often denoted by the letter A

10. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers

11. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge

12. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei

13. The ways in which electrons are arranged in various orbitals around the nuclei of atoms

14. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another

15. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.

16. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water

17. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.

18. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution

19. Gram equivalent weight of solute per liter of solution - often denoted by N.

20. An atom or group of atoms that has a positive or negative charge

21. A reaction in which atoms of one element take the place of atoms of another element in a compound

22. The tendency for an atom to attract electrons to itself when it is chemically combined with another element

23. A reaction in which atoms of one element take the place of atoms of another element in a compound

24. A reaction in which two or more substances combine to form a single substance A+B>>>>>>>C

25. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq

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