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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






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






3. 5 valence electrons -3 ions - Nitride N






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






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






6. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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






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






9. 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






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






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






12. 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






13. Small discrete increments of energy.






14. An elementary particle with 0 charge and mass about equal to a proton






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






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






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






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






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






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






21. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






23. 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






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






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






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






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






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






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






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






31. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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






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






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






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






36. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






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






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






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






41. The lowest allowable energy state of an atom






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






43. 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.






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






45. 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






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






47. 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






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






49. Two or more atoms held together by covalent bonds






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







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