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






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






3. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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4. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






5. Any sample of a given compound will contain the same elements in the identical mass ratio.






6. 2.18 x 10^-18 J/electron






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






8. A solution in which water is the solvent






9. 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






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






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






12. A solid made up of particles that are not arranged in a regular pattern.






13. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






14. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






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






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






17. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






18. A substance that - when dissolved in water - results in a solution that can conduct electricity






19. 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






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






21. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






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






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






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






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






26. A reaction where a compound does Not change its molecular structure.






27. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






28. The energy required to break a chemical bond and form neutral isolated atoms






29. 5 valence electrons -3 ions - Nitride N






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






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






32. 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.






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






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






35. 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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36. 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






37. 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






38. 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






39. E=hc/?






40. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






41. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






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






43. 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.






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






45. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






46. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






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






48. 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






49. 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






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