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






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






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






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






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






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






7. 2.18 x 10^-18 J/electron






8. 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






9. 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.






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






11. 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






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






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






14. Small discrete increments of energy.






15. A reaction where a compound does Not change its molecular structure.






16. 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






17. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






18. 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






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






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






21. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






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






23. 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






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






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






26. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






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






28. Simplest whole # ration of atoms in a compound






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






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

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






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






33. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






34. An ionic compound that resists changes in its pH






35. 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






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






37. 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






38. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






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






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






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






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






43. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






44. 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






45. 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.






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






47. A solution in which water is the solvent






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






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






50. The Percent by mass of each element in a compound.






Can you answer 50 questions in 15 minutes?



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