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






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






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






4. The lowest allowable energy state of an atom






5. 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.






6. Tells you how much solute is present compared to the amount of solvent






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






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






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






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






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






12. Named after their cation and anion






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






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






15. 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






16. The Percent by mass of each element in a compound.






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






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






19. 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






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






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






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






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






24. 2.18 x 10^-18 J/electron






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






26. Elements in the middle of the periodic table - in groups 3-12.






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






28. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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29. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






30. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






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






33. Small discrete increments of energy.






34. 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.






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






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






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






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






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






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






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






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






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






44. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






46. 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






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






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






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






50. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.