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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. 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






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






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






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






5. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






7. Numbers that specify the properties of atomic orbitals and of their electrons






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






9. The lowest allowable energy state of an atom






10. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






11. The Percent by mass of each element in a compound.






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






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






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






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






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






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






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






19. 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






20. 5 valence electrons -3 ions - Nitride N






21. 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






22. Simplest whole # ration of atoms in a compound






23. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






24. 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.






25. 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






26. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






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






28. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






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






30. 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






31. 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






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






33. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






34. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






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






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






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






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






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






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






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






42. 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.






43. Named after their cation and anion






44. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






45. 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.






46. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






48. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






50. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt