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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 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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2. The process by which one or more substances change to produce one or more different substances






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






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






5. 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






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






7. 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






8. Substance in which a solute is dissolved to form a solution






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






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






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






12. 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






13. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






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






16. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






17. 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






18. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






19. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






20. Tells you how much solute is present compared to the amount of solvent






21. 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.






22. 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.






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






24. 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






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






26. 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.






27. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






28. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






29. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






30. The average distance between the nuclei of two bonded atoms






31. Two or more atoms held together by covalent bonds






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






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






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






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






36. 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






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






38. The area of chemistry that is concerned with reaction rates and reaction mechanisms






39. Named after their cation and anion






40. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






42. 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






43. Redox reaction - in which the same species is both oxidized and reduced.






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






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






46. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






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






49. 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






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