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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 actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






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






3. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






4. 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.






5. 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.






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






7. 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.






8. 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






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






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






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






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






13. Gram equivalent weight of solute per liter of solution - often denoted by N.






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






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






16. 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






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






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






19. 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.






20. 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






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






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






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






24. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






25. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






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






28. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






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






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






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






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






34. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






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






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






37. 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






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






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






40. 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






41. Simplest whole # ration of atoms in a compound






42. 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-






43. 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.






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






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






46. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






47. 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






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






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