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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.
  • 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. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






2. 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.






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






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






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






6. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






7. E=hc/?






8. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






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






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






12. The lowest allowable energy state of an atom






13. 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.






14. Named after their cation and anion






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






16. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






17. 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






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






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






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






21. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






22. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






23. 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.






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






25. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






26. 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






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






28. 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.






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


30. 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






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






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






33. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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






36. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






37. 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






38. 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-






39. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






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






42. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






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






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






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






46. 5 valence electrons -3 ions - Nitride N






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






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






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






50. 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