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






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






3. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






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






6. Simplest whole # ration of atoms in a compound






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






8. E=hc/?






9. A definite stable energy that a physical system can have






10. Chalcogens - - Oxide O






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






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






13. 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






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






15. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






16. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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


18. Rare earth element group (elements 58-71)






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






20. 2.18 x 10^-18 J/electron






21. A solution in which water is the solvent






22. 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.






23. 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






24. Slightly less reactive than alkali metals - comprise group II






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






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






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






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






29. 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.






30. 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.






31. 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






32. 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






33. 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.






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






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






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






37. 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






38. 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






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






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






41. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






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






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






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






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






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






47. The lowest allowable energy state of an atom






48. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






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