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






2. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






3. An atom or group of atoms that has a positive or negative charge






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






5. 2.18 x 10^-18 J/electron






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






7. 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.






8. 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






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






10. Simplest whole # ration of atoms in a compound






11. The maximum amount of product that can be produced from a given amount of reactant






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






14. Named after their cation and anion






15. 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






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






17. 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






18. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






19. 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






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






21. An ionic compound that resists changes in its pH






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






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






24. Sum of the protons and neutrons in an element often denoted by the letter A






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






26. The area of chemistry that is concerned with reaction rates and reaction mechanisms






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. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






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






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






31. A subdivision of an energy level in an atom. They are divided into orbitals.






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






33. The lowest allowable energy state of an atom






34. A substance that - when dissolved in water - results in a solution that can conduct electricity






35. 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.






36. 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






37. 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






38. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






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






40. 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.






41. 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






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






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






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






45. The Percent by mass of each element in a compound.






46. 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






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






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






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






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