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






2. 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.






3. A base that can accept two moles of H+ per mole of itself (ex: SO4






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






5. Chalcogens - - Oxide O






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






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






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






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






10. 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






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






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






13. 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






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






15. 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.






16. Named after their cation and anion






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






18. An atom or group of atoms that has a positive or negative charge






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






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






21. 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.






22. 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.






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






24. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






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






26. 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






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






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






29. 2.18 x 10^-18 J/electron






30. 5 valence electrons -3 ions - Nitride N






31. 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






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






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






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






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






36. 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






37. 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






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






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






40. 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






41. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






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






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






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






45. 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






46. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






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






48. In a solution - the substance that dissolves in the solvent






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






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