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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. 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






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






3. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






4. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






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






6. 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.






7. 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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8. 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






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






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






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






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






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






14. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






15. Named after their cation and anion






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






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






18. 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






19. The lowest allowable energy state of an atom






20. 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






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






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






23. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






25. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






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






27. 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






28. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






29. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






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






32. Chalcogens - - Oxide O






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






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






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






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






37. 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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38. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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39. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






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






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






43. 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






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






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






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






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






48. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






49. 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.






50. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled







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