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






2. Simplest whole # ration of atoms in a compound






3. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






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






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






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






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






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






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






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






11. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






12. A horizontal row of elements in the periodic table






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






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






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






16. 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






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






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






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






20. 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






21. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






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






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


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






26. 5 valence electrons -3 ions - Nitride N






27. A solution in which water is the solvent






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






29. 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






30. 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.






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






32. 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






33. 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






34. 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






35. 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.






36. 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






37. Chalcogens - - Oxide O






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






39. 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


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






41. 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






42. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






43. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






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






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






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






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






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






49. Elements in the middle of the periodic table - in groups 3-12.






50. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated