Reference no: EM13838405
1.When chemicals pour on the skin, the laboratory first aid is to ---------------.
Apply 1% sodium carbonate
Apply 1% boric acid solution
Flush the eye with a copious amount of clean lukewarm running water
Wash with soap and warm water
2 For cut sustained in the laboratory which involve serious bleeding , the bleeding can be checked by --------------.
Applying direct pressure with a clean, sterile dressing
Elevate the wound above the heart and apply direct pressure with a clean, sterile dressing
Apply 1% sodium carbonate
Apply 1% boric acid solution
3 All these are pain relieving cream applied to burns and scalds where the skin is not broken in the laboratory EXCEPT -------------.
Jelly
Acriflavine
Shea butter
Moisturising cream
4 The second action to perform to resucitate a victim of gas inhaltion in the laboratory is to ----------------.
Remove the victim from danger area
Apply artificial respiration
Loosen clothing
Immediately seek emergency medical assistance
5 The first aid given to a person that ingested poisonous chemical in the laboratory include all these EXCEPT ----------------.
cold water to drink
Cold milk to drink
inducing vomiting
seek emergency medical assistance
6 The SI designation for amount of mole is --------------.
mole
mass
metre
candela
7 The SI designation candela is for --------------base unit.
Electric current
Luminous intensity
Amount of substance
Temperature
8 One of the following is not a proper way of preparing 0.025M solution from 1.00M stock solution.
2.5 mL of stock solution is diluted to 100mL
25 mL of stock solution is made up to 1000mL
12.5 mL of the stock solution is made up to 500mL
12.5 mL of the stock solution is made up to 750mL
9 All the following apparatus are needed for the preparation of a solution of hydrochloric acid, HCl, from the concentrated solution EXCEPT --------------.
Measuring cylinder
Burette
Crucible
Volumetric flask
10 If 15cm3 of 10.25M HCl solution is made up to volume in a 500 Ml volumetric flask, what will be its new concentration?
0.306M
3.06M
5.13M
0.52M
11 In the preparation of a solution, it is advisable to shake the mixture well. This is necessary to ----------------.
Ensure that the solution precipitates out very well
Induce air bubbles in the solution
Produce a homogenous solution
Facilitate use of lesser volume of water
12 To dilute an acid with water, acids are added to water and not water to acid because -----------------.
Acids are more vicourse than water
Water is weaker than acid
Dissolution of acid in water is exothermic which could be explosive
Acids will not dissolve in water if done wrongly
13 During standardization of HCl with sodium carbonate titration, the pipette is rinsed with distilled water and thereafter with ------------.
the HCl solutin
The methyl orange indicator
the Na2CO3
solution
More water
14 In a standardization titration involving hydrochloric acid and sodium carbonate, a student recoirded 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. What is
14.60mL
14.75mL
14.47mL
14.00mL
15 In a standardization titration involving hydrochloric acid and sodium carbonate, a student recoirded 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 c
1.02 Ml
1.03mL
1.07mL
1.04M
16 All these are safety precautions in a chemistry laboratory EXCEPT -----------.
carefully read all labels before using chemicals
perform only experiments that have been authorized by the instructor
wear loose clothings when in the chemistry laboratory
never pour water into concentrated acid.
17 Do not use flat-bottomed flasks in in vacuum experiment is a ------------- hazard
Explosion
Fire
Chemical
General safety
18 When an acidic chemical splashes into the eyes, the first thing to do is ---------
Apply 1% sodium carbonate
Apply 1% boric acid solution
Flush the eye with a copious amount of clean lukewarm running water
Put eye drop
19 When an acidic chemical splashes into the eyes, the second action to be carried out is ---------.
Apply 1% sodium carbonate
Apply 1% boric acid solution
Flush the eye with a copious amount of clean lukewarm running water
Put eye drop
20 When an alkalis chemical splashes into the eye, the second action to be carried out is ---------------.
Apply 1% sodium carbonate
Apply 1% boric acid solution
Flush the eye with a copious amount of clean lukewarm running water
Put eye drop