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Category: CHM191

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CHM191

1 / 50

If actual yield of an ester is 32.7g and theoretical yield is 35.1g .What is the percentage yield of the ester?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

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

6 / 50

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

7 / 50

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

8 / 50

$$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the volume of this acid that is required to prepare 250cm^{3} of 1.0 molar concentration of the acid$$.

9 / 50

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

10 / 50

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

11 / 50

The types of mixtures are _________, _________ mixture.

12 / 50

The actual yield of product (in g or moles) expressed as a percentage of the theoretical yield (in g or moles ) is called ____________

13 / 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 ______.

14 / 50

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

15 / 50

The solution whose concentration is known is called ___________

16 / 50

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? ________

17 / 50

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

18 / 50

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

19 / 50

$$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the moles per dm^{3}$$

20 / 50

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

21 / 50

An acid HA has a pka of 4.5, what is the Ka value? _________

22 / 50

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

23 / 50

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

24 / 50

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

25 / 50

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

26 / 50

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 _________

27 / 50

The separation technique employed to purify an organic liquid or to separate mixtures of liquids of different volatilities or boiling points is called __________

28 / 50

There are _______ types of titrimetric analysis.

29 / 50

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

30 / 50

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

31 / 50

The technique employed for the separation of colours is called _________

32 / 50

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

33 / 50

The base unit of a measured liquid called volume is __________

34 / 50

A high percentage yield implies that ___________

35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

A standard solution is a _________

40 / 50

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

41 / 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 ______

42 / 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. ___________

43 / 50

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

44 / 50

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

45 / 50

The condensate collected during the vaporization of liquid is called _________

46 / 50

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

47 / 50

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

48 / 50

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

49 / 50

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

50 / 50

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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