ATTENTION:
Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.
Good luck!
CHM191
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1. A standard solution of a substance can be prepared if the substance can be obtained in ______ state.
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2. A high percentage yield implies that ___________
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3. The process by which traces of water is removed by treating the liquid with suitable drying agents is called _________
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4. A mixture in which the components are evenly distributed and the composition is uniform throughout the mixture is called _________ mixture.
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5. The procedure by which a solution of known concentration is Added to another solution until the chemical reaction between the two ssolutes is complete is ______.
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6. An apparatus that can be used to remove traces of water from a substance is ________
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7. An acid HA has a pka of 4.5, what is the Ka value? _________
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8. A compound in grams is converted to moles by diving by ________
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9. The technique of separation employed to purify an organic solid that may be contaminated by impurities is called __________
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10. Calculate the [OH^{-}] of an aqueous solution of Ph=11 ____________
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11. In titration, the experimentally determined stoichiometric point of the titration is referred to as _______
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12. The types of mixtures are _________, _________ mixture.
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A substance with a pH value of >7< 10 is a ______________
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14. The smallest unit of a compound that manifest all the chemical properties of the compound is called ________
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15. There are _______ types of titrimetric analysis.
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16. The formular obtained by multiplying the number of each atom in the empirical formular by n is called ____________
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17. An undergraduate weighed out 20grams of sodium hydroxide pellets. If Na =23, O = 16 andH = 1, What is the mole of this sodium hydroxide. ___________
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18. A separation technique that is used to isolate a desired solid from a solid -liquid mixture or for freeing a desired liquid of solid impurities is called _________
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19. When propane reacts with oxygen, the products are ______ and ________
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20. Convert 500g of $$ Na_{2}CO_{3}$$ to moles _______
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21. The residue of a chemical reaction is allowed to cool in a ________
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22. The technique employed for the separation of colours is called _________
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23. The reagent with a ________ stoichiometric amount (in moles) that limits the amount of desired product (in moles ) formed is called
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24. When a substance is not available in a pure form, its solution can be standardized by ___________
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25. 3.47g sodium carbonate was dissolved in a 250millilitre standard flask. What is the concentration of the resulting solution
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26. $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the volume of this acid that is required to prepare 250cm^{3} of 1.0 molar concentration of the acid$$.
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27. The reagent that will not make any significant contribution to the theoretical yield is _________
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28. $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the moles per dm^{3}$$
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29. An acid HA has a pka of 4.5. What is the concentration of $$H_{3}^{+} $$ in 0.110M solution of the acid ? ________
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30. In this equation $$2NaHCO_{3} → Na_{2}CO_{3} + ? + CO_{3}$$, the compound represented by ? is __________
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31. The number of protons or electrons in the atom of an element is equal to the _________ of the element
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32. When two or more elements combine chemically in fixed proportion by mass, is formed _________
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33. The solution whose concentration is known is called ___________
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34. The actual yield of product (in g or moles) expressed as a percentage of the theoretical yield (in g or moles ) is called ____________
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35. The base unit of a measured liquid called volume is __________
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36. The condensate collected during the vaporization of liquid is called _________
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37. The number of gramequivalent weight of solute in one cubic decimeter of solution is ______
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38. A standard solution is a _________
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39. The separation technique employed to purify an organic liquid or to separate mixtures of liquids of different volatilities or boiling points is called __________
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40. There are _____ different techniques for determination of an unknown sample in titrimetric analysis.
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41. The molar mass of $$Na_{2}CO_{3}$$ ________
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42. Dissolution 0f sodium chloride in water results in __________ type of mixture
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43. The separation technique employed to separate mixtures of two or more liquids with slightly different boiling points is called __________
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44. From the equation $$2HCl + Na_{2}CO_{3} → 2NaCl + CO_{2} + H_{2}O$$, given that 2 moles of HCl reacted with 1 mole of $$Na_{2}CO_{3}$$. What was the concentration of the acid?
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45. If actual yield of an ester is 32.7g and theoretical yield is 35.1g .What is the percentage yield of the ester?
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46. When two or more elements combine chemically in fixed proportion by mass, _________ is formed
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47. Calculate the $$[H^{+}] $$of an aqueous solution wity $$[OH^{-}] of 1× 10^{-10}M$$. What is the pH of the solution? Is the solution acidic or basic? ________
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48. In a standardization titration involving hydrochloric acid and sodium carbonate, a student recorded the following results for the volume of hydrochloric acid used against 10.00mL of the sodium carbonate solution : 15.60; 14.50; 14.70 aqnd 14.20. If the concentration of the $$Na_{2}CO_{3}$$ standard solution is 0.75moldm^-3, calculate the concentration of the HCl solution.
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49. Convert 2 moles of NaOH to grams of NaOH. Answer is ________
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50. The base unit of a measured or weighed solid material in chemistry is ________
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