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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. An ionic compound that resists changes in its pH






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

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






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






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






6. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






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






8. An equilibrium expression used to measure weak - acid strength - given by the ratio of the product of the products' molar concentrations to the product of the reactants' molar concentrations - with each term raised to the power of its stoichiometric






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






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






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






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






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






14. The lowest allowable energy state of an atom






15. Chalcogens - - Oxide O






16. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






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






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






19. Property of the elements that can be predicted from the arrangement of the periodic table






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






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






22. 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






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






24. 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.






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






26. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






27. 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






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






29. Sum of the protons and neutrons in an element often denoted by the letter A






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






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






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






33. 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.






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






35. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






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






37. 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






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






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






40. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






41. 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






42. A solution in which water is the solvent






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






44. 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.






45. 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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46. E=hc/?






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






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






49. 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






50. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors