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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 chemical formula showing the ratio of elements in a compound rather than the total number of atoms






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






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






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






5. 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






6. 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






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






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






9. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






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






11. 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






12. 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.






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






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






15. 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






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






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

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






19. In a solution - the substance that dissolves in the solvent






20. 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-






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






22. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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23. Named after their cation and anion






24. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






25. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






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






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






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






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






31. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






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






34. 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






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






36. 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






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






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






39. 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.






40. 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






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






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






43. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






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






45. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






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






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






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