# CHM191

## Category:CHM191

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CHM191

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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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\$\$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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When two or more elements combine chemically in fixed proportion by mass, _________ is formed

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The technique of separation employed to purify an organic solid that may be contaminated by impurities is called __________

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Calculate the \$\$[H^{+}] \$\$of an aqueous solution wity \$\$[OH^{-}] of 1Ã— 10^{-10}M\$\$. What is the pH of the solution? Is the solution acidic or basic? ________

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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 _________

7 / 50

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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The technique employed for the separation of colours is called _________

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A mixture in which the components are evenly distributed and the composition is uniform throughout the mixture is called _________ mixture.

10 / 50

The solution whose concentration is known is called ___________

11 / 50

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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There are _______ types of titrimetric analysis.

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Dissolution 0f sodium chloride in water results in __________ type of mixture

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The smallest unit of a compound that manifest all the chemical properties of the compound is called ________

15 / 50

The reagent with a ________ stoichiometric amount (in moles) that limits the amount of desired product (in moles ) formed is called

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The base unit of a measured or weighed solid material in chemistry is ________

17 / 50

The types of mixtures are _________, _________ mixture.

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The process by which traces of water is removed by treating the liquid with suitable drying agents is called _________

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An apparatus that can be used to remove traces of water from a substance is ________

20 / 50

When a substance is not available in a pure form, its solution can be standardized by ___________

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The separation technique employed to separate mixtures of two or more liquids with slightly different boiling points is called __________

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A substance with a pH value of >7< 10 is a ______________

23 / 50

There are _____ different techniques forÂ  determination of an unknown sample in titrimetric analysis.

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When two or more elements combine chemically in fixed proportion by mass, is formed _________

25 / 50

A standard solution is a _________

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A standard solution of a substance can be prepared if the substance can be obtained in ______ state.

27 / 50

In this equation \$\$2NaHCO_{3} â†’ Na_{2}CO_{3} + ? + CO_{3}\$\$, the compound represented by ? is __________

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In titration, the experimentally determined stoichiometric point of the titration is referred to as _______

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The molar mass of \$\$Na_{2}CO_{3}\$\$ ________

30 / 50

Calculate the [OH^{-}] of an aqueous solution of Ph=11 ____________

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The reagent that will not make any significant contribution to the theoretical yield is _________

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An acid HA has a pka of 4.5. What is the concentration of \$\$H_{3}^{+} \$\$ in 0.110M solution of the acid ? ________

33 / 50

An undergraduate weighed out 20grams of sodium hydroxide pellets. If Na =23, O = 16 andH = 1, What is the mole of this sodium hydroxide. ___________

34 / 50

The condensate collected during the vaporization of liquid is called _________

35 / 50

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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The number of protons or electrons in the atom of an element is equal to the _________ of the element

37 / 50

The concentration of the pure HCl used is 11.7 molar. If \$\$20.0cm^{3}\$\$ V1 of 1 1.7 molar of \$\$C_{1}\$\$ of HCl is diluted to 250cm^{3} of V_{2}, then the new concentration C_{2} will be ______

38 / 50

Convert 2 moles of NaOH to grams of NaOH. Answer is ________

39 / 50

The base unit of a measured liquid called volume is __________

40 / 50

\$\$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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3.47g sodium carbonate was dissolved in a 250millilitre standard flask. What is the concentration of the resulting solution

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From the equation \$\$2HCl + Na_{2}CO_{3} â†’ 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?

43 / 50

The number of gramequivalent weight of solute in one cubic decimeter of solution is ______

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The formular obtained by multiplying the number of each atom in the empirical formular by n is called ____________

45 / 50

The residue of a chemical reaction is allowed to cool in a ________

46 / 50

Convert 500g of \$\$ Na_{2}CO_{3}\$\$ to moles _______

47 / 50

A high percentage yield implies that ___________

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A compound in grams is converted to moles by diving by ________

49 / 50

When propane reacts with oxygen, the products are ______Â  and ________

50 / 50

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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