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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 process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






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






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






4. 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






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






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


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






8. 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






9. 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






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






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






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






13. Gram equivalent weight of solute per liter of solution - often denoted by N.






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


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






16. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






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






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






19. 5 valence electrons -3 ions - Nitride N






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






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






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






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






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






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






26. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms






27. 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






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






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






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






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






32. 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






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






34. 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.






35. Chalcogens - - Oxide O






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






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






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






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






40. 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






41. 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






42. Tells you how much solute is present compared to the amount of solvent






43. E=hc/?






44. Any sample of a given compound will contain the same elements in the identical mass ratio.






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






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






47. Simplest whole # ration of atoms in a compound






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






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






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