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






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






3. 5 valence electrons -3 ions - Nitride N






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






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






6. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






7. A substance that - when dissolved in water - results in a solution that can conduct electricity






8. 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






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






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






11. 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.






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






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






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






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






16. Chalcogens - - Oxide O






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






18. 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






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






20. 2.18 x 10^-18 J/electron






21. 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






22. Any sample of a given compound will contain the same elements in the identical mass ratio.






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






24. 5 different orbitals shaped like clover leaves and max electrons is 10






25. 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






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






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

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






30. Simplest whole # ration of atoms in a compound






31. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






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






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






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






35. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






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






37. 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.






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






39. A reaction where a compound does Not change its molecular structure.






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






41. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






42. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






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






44. 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.






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






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






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






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






49. (chemistry) p(otential of) H(ydrogen)






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