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






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






3. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






4. E=hc/?






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






6. 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






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






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






9. 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






10. 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






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






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






13. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






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






15. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






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






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






18. 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.






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






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






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






22. 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.






23. 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






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






25. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






26. 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






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






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






29. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






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






31. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T


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






33. An ionic compound that resists changes in its pH






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






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






36. 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






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






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






39. Slightly less reactive than alkali metals - comprise group II






40. Simplest whole # ration of atoms in a compound






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






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






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






44. Two or more atoms held together by covalent bonds






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






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






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






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






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






50. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule