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






2. 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






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






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






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






6. 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.






7. 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.






8. 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






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






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






11. 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






12. Small discrete increments of energy.






13. 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






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






15. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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






17. 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






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






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






20. 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






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






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






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






24. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






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






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






28. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






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






30. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






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






33. 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






34. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






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






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






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






38. 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.






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






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






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






42. 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






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






44. 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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45. 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






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






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






48. The lowest allowable energy state of an atom






49. 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






50. 5 different orbitals shaped like clover leaves and max electrons is 10