2017_1 TMA Solutions - CHM191, Introductory Practical Chemistry I

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2017_1 TMA Solutions - CHM191, Introductory Practical Chemistry I

Postby admin » Sun Sep 17, 2017 11:40 am

1 A substance not suitable as a primary standard probably has the following properties EXCEPT

Has unchanged chemical composition during storage


2 Calculate the number of mole contained in a solution of sulphuric acid, if the titre value on titration against 20cm{3} 0.5 M sodium carbonate is 20.24cm^{3}

0.01mol


3 A metal X that raects with metal Y in a solution of Y but does not react with Z in a solution of Z means that --------------.

Metal Y is the least reactive


4 An organic substance which changes colour in a titrrated solution when an amount of the titrant added is equivalent, or with negligible error, almost equivalent to the sample is ______.

Indicator


5 $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the volume of this acid that is required to prepare 250cm^{3} of 1.0 molar concentration of the acid$$.

$$2.0cm^{3}$$


6 $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the moles per dm^{3}$$

$$12.5mold m^{3}$$


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

pure state


8 $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the concentrationin grams per dm{3}$$.

$$700g/dm^{3}$$
9 A solution of which the concentration is accurately known is __________.

Standard solution


10 $$Weight of solute in gram per volume of solutions in cm^{3}$$ multiplied by 100 is________.

percentage weight by volume


11 A boiling water bath can be used for all these EXCEPT _______.

coagulation of precipita te


12 ________ increases the solubility of most substances.

Heating


13 All these are components of brief outline of experimental procedure.

Results


14 Burns generally caused by hot equipment can be treated as _______ are treated.

cuts


15 An irritant of these chemicals is ________.

Benzoyl chloride


16 AgNO3 causes _______ burns.

caust ic


17 An effective method for purification of volatile solids is __________.

Sublimation


18 A sharp melting point have a range of __________

1-2 degree celcius


19 A narrow range of temperature in a sample indicates __________

high purity


20 A method of separation useful for purification and isolation is __________.

crystallization



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Re: 2017_1 TMA Solutions - CHM191, Introductory Practical Chemistry I

Postby admin » Sun Sep 17, 2017 11:43 am

1 An organic substance which changes colour in a titrrated solution when an amount of the titrant added is equivalent, or with negligible error, almost equivalent to the sample is ______.

Indicator


2 $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the volume of this acid that is required to prepare 250cm^{3} of 1.0 molar concentration of the acid$$.

$$2.0cm^{3}$$


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

$$12.5moldm^{3}$$


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

pure state


5 $$The label on a stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 56, find the concentrationin grams per dm{3}$$.

$$700g/dm^{3}$$


6 A solution of which the concentration is accurately known is __________.

Standard solution


7 $$Weight of solute in gram per volume of solutions in cm^{3}$$ multiplied by 100 is________.

percentage weight by volume


8 Copper or aluminium fitted with a series of metallic rings to adjust ________ of a boiling water bath.

size of the opening


9 A boiling water bath can be used for all these EXCEPT _______.

coagulation of precipita te


10 ________ increases the solubility of most substances.

Heating


11 All these are components of brief outline of experimental procedure.

Results


12 Burns generally caused by hot equipment can be treated as _______ are treated.

cuts


13 An irritant of these chemicals is ________.

Benzoyl chloride


14 AgNO3 causes _______ burns.

caust ic


15 An effective method for purification of volatile solids is __________.

Sublimation


16 Crystallization occurs on ___________.

cooling


17 A sharp melting point have a range of __________

1-2 degree celcius


18 A narrow range of temperature in a sample indicates __________

high purity


19 Crystallization process is restricted to ______________.

solids


20 A method of separation useful for purification and isolation is __________.

crystallization
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Re: 2017_1 TMA Solutions - CHM191, Introductory Practical Chemistry I

Postby admin » Sun Sep 17, 2017 11:45 am

1 The process in which ions present in solution is converted into an insoluble compound is

Precipitation


2 When there is a spill of _______ in the eyes, you wash with ethanol and then hospital treatment.

Phenol


3 The temperature range of drying ovens can be thermostatically controlled to within _________ degree celcius.

1 to 2


4 Electric ovens have a temperature range from romm temperature to about _________ degree temperature.

300 degree


5 Copper or aluminium fitted with a series of metallic rings to adjust ________ of a boiling water bath.

size of the opening


6 When there is a spill of _______ , washwith 2M ammonia and keep the affected part dipped in NaHSO3.

Br2


7 A boiling water bath can be used for all these EXCEPT _______.

coagulation of precipita te


8 The last item in a laboratory book with good format is ______.

Calculations if necessary


9 In gravimetric analysis, the precipitate is sometimes heated to a high temperature to convert it into a compound of _______.

consstant com position


10 The usage of the first few pages in the laboratory notebook is for ______.

making a list of content


11 When there is a spill of _______ in the eyes, you apply ethanol on a cotton wool pad.

Sodium


12 ________ increases the solubility of most substances.

Heating


13 All these are components of brief outline of experimental procedure.

Results


14 The first item in a laboratory book with good format is ______.

Title of the experiment


15 When there is a spill of _______ in the eyes, you wash with 1M acetic acid then apply vaseline.

NaOH

16 Burns generally caused by hot equipment can be treated as _______ are treated.

cuts


17 An irritant of these chemicals is ________.

Benzoyl chloride


18 one of these is a narcotics, causing mental confusion.

CHCl3


19 AgNO3 causes _______ burns.

caust ic


20 Of all the listed chemical, the most dangerous and which causess rapid destruction of the skin is _________.

HF
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Posts: 1900
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Contact:

Re: 2017_1 TMA Solutions - CHM191, Introductory Practical Chemistry I

Postby admin » Sun Sep 17, 2017 11:48 am

1 Electric ovens have a temperature range from romm temperature to about _________ degree temperature.

300 degree


2 Copper or aluminium fitted with a series of metallic rings to adjust ________ of a boiling water bath.

size of the opening


3 A boiling water bath can be used for all these EXCEPT _______.

coagulation of precipitate


4 In gravimetric analysis, the precipitate is sometimes heated to a high temperature to convert it into a compound of _______.

consstant composition


5 ________ increases the solubility of most substances.

Heating


6 All these are components of brief outline of experimental procedure.

Results


7 Burns generally caused by hot equipment can be treated as _______ are treated.

cuts


8 An irritant of these chemicals is ________.

Benzoyl chloride


9 AgNO3 causes _______ burns.

caust ic


10 Of all the listed chemical, the most dangerous and which causess rapid destruction of the skin is _________.

HF


11 An effective method for purification of volatile solids is __________.

Sublimation


12 Crystallization occurs on ___________.

cooling


13 Insoluble impurities may be removed from a solution by _________.

filteration


14 Impurity will cause _________ range to become wider .

melting point


15 A sharp melting point have a range of __________

1-2 degree celcius


16 A narrow range of temperature in a sample indicates __________

high purity


17 Crystallization process is restricted to ______________.

solids


18 A method of separation useful for purification and isolation is __________.

crystallization


19 Induced crystal growth can be achieved through _________.

seeding


20 High coloured contaminants may be removed from solution by adding __________.

activ ated carbon


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