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






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






3. 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






4. 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






5. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






6. 2.18 x 10^-18 J/electron






7. 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.






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






9. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






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






11. 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






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






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






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






15. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






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






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






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






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






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






22. The area of chemistry that is concerned with reaction rates and reaction mechanisms






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






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






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






26. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






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






28. 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






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






30. 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






31. 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






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






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






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






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






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






37. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






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






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






40. 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.






41. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






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






43. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






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






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






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






48. Two or more atoms held together by covalent bonds






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






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