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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






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






4. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






5. 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






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






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






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






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






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






11. 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






12. The process of decomposing a chemical compound by the passage of an electric current.






13. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






14. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






15. E=hc/?






16. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






17. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






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






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






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






21. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






22. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






23. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






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






25. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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26. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






27. (chemistry) p(otential of) H(ydrogen)






28. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






29. 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






30. Simplest whole # ration of atoms in a compound






31. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






32. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






34. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






36. The lowest allowable energy state of an atom






37. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






38. 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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39. 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






40. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






42. Named after their cation and anion






43. 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






44. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






45. 5 different orbitals shaped like clover leaves and max electrons is 10






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






47. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






48. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






49. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






50. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.