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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 ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






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






3. 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.






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






5. 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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6. 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.






7. 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.






8. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






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






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






11. Named after their cation and anion






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






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

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






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. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






17. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






18. 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






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






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






21. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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






23. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






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






25. 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






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






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






28. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






29. 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






30. The process of decomposing a chemical compound by the passage of an electric current.






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






32. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






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






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






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






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






38. The average distance between the nuclei of two bonded atoms






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






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






41. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






42. 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-






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






44. Substance in which a solute is dissolved to form a solution






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






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






47. 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






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






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






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