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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






2. 2.18 x 10^-18 J/electron






3. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






4. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






5. In a solution - the substance that dissolves in the solvent






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






7. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






8. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






9. 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.






10. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






11. Simplest whole # ration of atoms in a compound






12. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






13. Having characteristics of both an acid and a base and capable of reacting as either






14. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






15. Property of the elements that can be predicted from the arrangement of the periodic table






16. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






17. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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18. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






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






20. Elements in the middle of the periodic table - in groups 3-12.






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






22. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






23. Chalcogens - - Oxide O






24. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






25. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






26. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






27. A dynamic condition in which two opposing changes occur at equal rates in a closed system






28. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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29. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






30. Slightly less reactive than alkali metals - comprise group II






31. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






33. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






34. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






35. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






36. The slowest elementary step which is the limit for the rate of the other steps






37. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






38. 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






39. A solution in which water is the solvent






40. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






41. An elementary particle with 0 charge and mass about equal to a proton






42. 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






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






44. A base that can accept two moles of H+ per mole of itself (ex: SO4






45. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






46. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






47. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






48. Rare earth element group (elements 58-71)






49. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






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