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






3. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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. 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






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






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






8. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






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






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






11. (chemistry) a substance that changes color to indicate the presence of some ion or substance






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






13. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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






15. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






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






17. 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






18. Gram equivalent weight of solute per liter of solution - often denoted by N.






19. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






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






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






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






24. 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






25. 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.






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






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






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






29. E=hc/?






30. 2.18 x 10^-18 J/electron






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






33. An ionic compound that resists changes in its pH






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






35. The slowest elementary step which is the limit for the rate of the other steps






36. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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37. 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






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






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






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






41. In a solution - the substance that dissolves in the solvent






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






43. 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






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






45. Substance in which a solute is dissolved to form a solution






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






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






48. 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.






49. 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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50. 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







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