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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. 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






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






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






4. E=hc/?






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






6. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






8. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






9. 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.






10. Two or more atoms held together by covalent bonds






11. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






12. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






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






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






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






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






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






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






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






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






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






23. Simplest whole # ration of atoms in a compound






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






25. 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






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






27. 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






28. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






29. 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






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






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






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






33. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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






35. 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






36. In a solution - the substance that dissolves in the solvent






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






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






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






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






41. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






42. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






43. A solution in which water is the solvent






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






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






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






47. 5 valence electrons -3 ions - Nitride N






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






49. 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-






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