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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. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






2. 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






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






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






5. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






6. 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






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






8. 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.






9. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






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

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






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






14. 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






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






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






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






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






19. 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-






20. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






21. 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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22. 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






23. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






24. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






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






26. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






28. 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






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






30. 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






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






32. Small discrete increments of energy.






33. Named after their cation and anion






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






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






36. Chalcogens - - Oxide O






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






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






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






40. 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






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






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






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






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






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






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






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






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






49. 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.






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