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






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






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






6. 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.






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






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






9. 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






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






11. Rare earth element group (elements 58-71)






12. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






14. E=hc/?






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






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






17. 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.






18. An ionic compound that resists changes in its pH






19. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






33. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






35. Slightly less reactive than alkali metals - comprise group II






36. The lowest allowable energy state of an atom






37. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






38. 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






39. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






40. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






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






43. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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






45. Acids defined as electron - pair acceptors and bases as electron - pair donors.






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






47. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






48. 2.18 x 10^-18 J/electron






49. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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