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






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






3. 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






4. 5 valence electrons -3 ions - Nitride N






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






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






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






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






9. Rare earth element group (elements 58-71)






10. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






11. 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






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






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






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






15. PH of a molecule at which it contains no net electric charge - isoelectric point.






16. 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






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






18. 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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19. 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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20. A dynamic condition in which two opposing changes occur at equal rates in a closed system






21. 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






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






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






24. 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.






25. 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






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






27. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






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






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






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






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






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






34. 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.






35. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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






37. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






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






40. Two or more atoms held together by covalent bonds






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






42. 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






43. 5 different orbitals shaped like clover leaves and max electrons is 10






44. 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






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






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






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






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






49. 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.






50. Numbers that specify the properties of atomic orbitals and of their electrons