Test your basic knowledge |

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 Percent by mass of each element in a compound.






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






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






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






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






6. 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






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






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






9. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






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






12. 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-






13. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






14. 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






15. 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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


18. 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






19. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






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






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






22. 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






23. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






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






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






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






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






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






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






31. 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






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






33. A solution in which water is the solvent






34. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






35. 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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






38. 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.






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






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






41. The lowest allowable energy state of an atom






42. 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






43. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






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






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






46. 2.18 x 10^-18 J/electron






47. 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






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






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






50. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183