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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.
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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. A horizontal row of elements in the periodic table






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






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






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






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






6. A dynamic condition in which two opposing changes occur at equal rates in a closed system






7. 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






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






9. 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






10. 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.






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






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






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






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






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






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






17. PH of a molecule at which it contains no net electric charge - isoelectric point.






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






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






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






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






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






23. 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.






24. 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






25. Numbers that specify the properties of atomic orbitals and of their electrons






26. The percent by mass of each element in a compound






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






28. 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






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






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






32. The maximum amount of product that can be produced from a given amount of reactant






33. (chemistry) a substance that changes color to indicate the presence of some ion or substance






34. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






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






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






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






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






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






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






42. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






43. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






45. 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






46. Two or more atoms held together by covalent bonds






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






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






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






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