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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.
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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. Named after their cation and anion






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






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






4. 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






5. 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






6. 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.






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






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






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






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






11. 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.






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






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






14. 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






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






16. Chalcogens - - Oxide O






17. 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






18. 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






19. 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.






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






21. 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






22. 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






23. 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






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






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

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






27. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






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






29. An atom or group of atoms that has a positive or negative charge






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






31. Small discrete increments of energy.






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






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






34. E=hc/?






35. The lowest allowable energy state of an atom






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






37. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






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






40. PH of a molecule at which it contains no net electric charge - isoelectric point.






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






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






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






44. 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.






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






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






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






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






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






50. 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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