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






2. 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






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






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






5. 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.






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






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






8. 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






9. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






10. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






11. 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






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. The percent by mass of each element in a compound






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






15. 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






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






17. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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






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






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






21. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






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






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






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






25. Chalcogens - - Oxide O






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






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






28. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






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






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






31. 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






32. 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






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






34. 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






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






36. 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.






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






38. 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






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






40. 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.






41. 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.






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






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






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






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






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






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






48. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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






50. The average distance between the nuclei of two bonded atoms