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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. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






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






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






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






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






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






7. Chalcogens - - Oxide O






8. 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-






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






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






11. 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.






12. 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






13. 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






14. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






15. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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






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






18. A solution in which water is the solvent






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






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






21. A horizontal row of elements in the periodic table






22. 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.






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






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






25. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






26. 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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27. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






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






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






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






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






32. 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






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






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






35. 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






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






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






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






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






40. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






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






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






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






44. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






46. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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47. 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






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






49. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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