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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. An ionic compound that resists changes in its pH






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






3. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






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






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






7. A horizontal row of elements in the periodic table






8. 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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9. 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.






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






11. 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.






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






13. Two or more atoms held together by covalent bonds






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






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






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






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

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






19. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






20. 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.






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






22. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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






24. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






25. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






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






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






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

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






30. 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






31. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






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






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






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






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






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






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






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






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






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






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






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






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






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






45. 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






46. 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






47. 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






48. 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






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






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