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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






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






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






4. (chemistry) p(otential of) H(ydrogen)






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






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






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






8. 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






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






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






11. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






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






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






15. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






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






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






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






19. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






20. 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






21. 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






22. 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.






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






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






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






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






27. Chalcogens - - Oxide O






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






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






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






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






32. 5 valence electrons -3 ions - Nitride N






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






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






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






36. 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.






37. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






38. The energy required to break a chemical bond and form neutral isolated atoms






39. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






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






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






42. 2.18 x 10^-18 J/electron






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






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






46. Named after their cation and anion






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






48. 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.






49. A horizontal row of elements in the periodic table






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







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