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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 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






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






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






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






5. 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






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






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






8. 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.






9. 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-






10. Small discrete increments of energy.






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






12. 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.






13. Two or more atoms held together by covalent bonds






14. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






15. 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






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






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






18. 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






19. Simplest whole # ration of atoms in a compound






20. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






21. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






23. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






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






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






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


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






28. The energy required to break a chemical bond and form neutral isolated atoms






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






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






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






32. 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






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






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






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






36. A horizontal row of elements in the periodic table






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






38. A solid made up of particles that are not arranged in a regular pattern.






39. 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






40. The lowest allowable energy state of an atom






41. 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


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






43. 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.






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






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






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






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






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






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






50. 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