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






2. 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






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. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






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






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






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






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

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11. 5 valence electrons -3 ions - Nitride N






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






13. 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.






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






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






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






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






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






20. 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.






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






22. Sum of the protons and neutrons in an element often denoted by the letter A






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






24. 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






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






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






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






28. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






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






30. 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






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






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






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






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






35. A subdivision of an energy level in an atom. They are divided into orbitals.






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






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






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






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






41. 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.






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






43. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






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






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






46. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






48. 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.






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






50. An ionic compound that resists changes in its pH