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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 lowest allowable energy state of an atom






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






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






4. A substance that - when dissolved in water - results in a solution that can conduct electricity






5. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






6. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






7. 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.






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






9. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






10. 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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11. 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






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






13. 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






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






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






16. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






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






18. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






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






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

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






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






23. 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






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






25. 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






26. 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






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






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






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






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






31. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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






33. 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






34. 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






35. The percent by mass of each element in a compound






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






37. E=hc/?






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






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






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






41. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






42. 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






43. A solution in which water is the solvent






44. Chalcogens - - Oxide O






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






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






47. 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






48. 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.






49. 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






50. 2.18 x 10^-18 J/electron







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