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






2. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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






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






5. Named after their cation and anion






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






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






8. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






9. 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






10. 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






11. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






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






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






14. 5 different orbitals shaped like clover leaves and max electrons is 10






15. 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






16. E=hc/?






17. 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






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






20. 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






21. Chalcogens - - Oxide O






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






23. 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.






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






25. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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






27. 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






28. 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






29. An atom or group of atoms that has a positive or negative charge






30. 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






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






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






33. 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






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

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35. An ionic compound that resists changes in its pH






36. 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.






37. 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






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






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






40. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






41. 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






42. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






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






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






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






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






48. 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






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






50. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.