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






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






3. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






4. A horizontal row of elements in the periodic table






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






6. Simplest whole # ration of atoms in a compound






7. 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.






8. 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






9. (chemistry) p(otential of) H(ydrogen)






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






11. An atom or group of atoms that has a positive or negative charge






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






13. 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






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






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






16. 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






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






18. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






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






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






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






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






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






24. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






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






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






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






28. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






29. 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






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






31. 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






32. 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






33. Two or more atoms held together by covalent bonds






34. 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






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

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






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






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






39. 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.






40. 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






41. The process of decomposing a chemical compound by the passage of an electric current.






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






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






44. 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






45. 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






46. 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






47. Redox reaction - in which the same species is both oxidized and reduced.






48. 2.18 x 10^-18 J/electron






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






50. 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