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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 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






2. 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






3. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






4. 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






5. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






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






7. 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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8. 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






9. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






10. Simplest whole # ration of atoms in a compound






11. 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.






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






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






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






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






16. 5 different orbitals shaped like clover leaves and max electrons is 10






17. 5 valence electrons -3 ions - Nitride N






18. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






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






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






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






22. E=hc/?






23. 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






24. 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.






25. 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






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






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






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






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






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






31. Named after their cation and anion






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






33. 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






34. 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






35. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






36. A horizontal row of elements in the periodic table






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






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






39. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






40. 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






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






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






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






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






45. 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






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






47. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






49. 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






50. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT