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






2. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






3. 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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4. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






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






6. 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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7. The Percent by mass of each element in a compound.






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






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. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






11. 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.






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






13. 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






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






15. 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






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






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






18. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






19. 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






20. 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






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






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






24. 2.18 x 10^-18 J/electron






25. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






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






27. 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






28. 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






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






30. Two or more atoms held together by covalent bonds






31. Chalcogens - - Oxide O






32. 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






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






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






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






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






37. Redox reaction - in which the same species is both oxidized and reduced.






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






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






40. 5 different orbitals shaped like clover leaves and max electrons is 10






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






42. 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






43. Named after their cation and anion






44. 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






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






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






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






48. 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.






49. (chemistry) a substance that changes color to indicate the presence of some ion or substance






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