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






2. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






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






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






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






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






7. 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






8. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






9. 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






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






11. 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






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






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






14. 5 valence electrons -3 ions - Nitride N






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






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

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17. Small discrete increments of energy.






18. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






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






20. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






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






22. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






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






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






26. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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






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






29. The pressure exerted by a vapor in equilibrium with its liquid or solid phase






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






31. 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.






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






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






34. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






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






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






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






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






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






40. 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






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






42. 5 different orbitals shaped like clover leaves and max electrons is 10






43. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






44. 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






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






46. 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






47. 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.






48. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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49. A solution in which water is the solvent






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