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






2. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






3. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






5. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






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






7. 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






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






9. Named after their cation and anion






10. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






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






12. The pressure exerted by a vapor in equilibrium with its liquid or solid phase






13. The lowest allowable energy state of an atom






14. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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15. 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






16. An ionic compound that resists changes in its pH






17. 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.






18. 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






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






20. A subdivision of an energy level in an atom. They are divided into orbitals.






21. 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






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






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






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






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






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






27. 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






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






29. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






30. 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






31. 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






32. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






33. 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






34. 2.18 x 10^-18 J/electron






35. 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






36. 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






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






38. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






39. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






40. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






41. Small discrete increments of energy.






42. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






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






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






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






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






48. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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