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






2. E=hc/?






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






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






5. An ionic compound that resists changes in its pH






6. Chalcogens - - Oxide O






7. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






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






9. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






10. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






11. 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






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






13. 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






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






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






16. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






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






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






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






20. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






22. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






23. 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-






24. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






25. 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






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






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






28. 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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29. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






31. 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






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






33. 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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34. 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






35. 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.






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






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






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






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






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






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






42. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






43. 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






44. 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






45. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






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






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






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






49. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






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