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






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

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






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






5. Two or more atoms held together by covalent bonds






6. 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.






7. 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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8. 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






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






10. 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






11. An ionic compound that resists changes in its pH






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






13. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






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






15. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






16. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






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






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






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






20. 5 different orbitals shaped like clover leaves and max electrons is 10






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






22. 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






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






24. 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.






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






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






27. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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. 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.






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






31. 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






32. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






33. 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






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






35. The pressure exerted by a vapor in equilibrium with its liquid or solid phase






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






37. Gram equivalent weight of solute per liter of solution - often denoted by N.






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






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






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






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






42. 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






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






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






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






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






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






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






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






50. 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