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






2. A definite stable energy that a physical system can have






3. 2.18 x 10^-18 J/electron






4. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






5. 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.






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






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






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






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






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






11. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






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






14. 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






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






16. 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






17. Rare earth element group (elements 58-71)






18. Simplest whole # ration of atoms in a compound






19. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






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






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






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






23. The slowest elementary step which is the limit for the rate of the other steps






24. The energy required to break a chemical bond and form neutral isolated atoms






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






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






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






28. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






29. 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






30. 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






31. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






32. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






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






34. Small discrete increments of energy.






35. (chemistry) p(otential of) H(ydrogen)






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






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






38. 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






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






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






41. A horizontal row of elements in the periodic table






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






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






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






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






46. Chalcogens - - Oxide O






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






48. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






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






50. An ionic compound that resists changes in its pH