AliceCHM103 Past Question is one of the most important for science students. Due to the complicated nature of the examination, many people are unable to do well in the examination. If you are one of the students in this category, then you do not need to bother about it anymore because we have the solution to that problem, and the solution is in having CHM103 Past Questions.
You need to understand that before going for any examination, maximum preparation is required to get the necessary success. Therefore, we bring you information on CHM103 Past Question, what it is all about, how it is patterned to suit your demand, and the easiest way to download or get it.
Why you need the CHM103 Past Questions?
It will expose you to the questions that have been asked years back as most of those questions and answers get repeated every year while some will just be rephrased. So if you don’t have a copy of this past question, then you are losing out. It also provides useful information about the types of questions to expect. You will find out the number of questions you will see in the examination.
How is CHM103 Past Questions Patterned?
We have made it simple for you. we bring all the questions which is usually in objective format since it is not usually cbt examinations. We have put them together but we indicate the specific years for every question and the correct answers in order to save your time. All you need to do is to devote quality time to studying the Past Questions.
Sample of CHM301 PAST QUESTION
Organic compounds can be obtained from __________ and
can also be made synthetically in the laboratory.
ANS=NATURAL SOURCES
2.________ organic chemistry involves the determination of
organic compounds.
ANS=QUALITATIVE
3.The most obvious method of using a balance is known as________?
ANS=DIRECT WEIGHING.
4.__________system not only measure total mass but
also may determine such characteristics as average weight
and moisture content?
ANS=ELECTRONIC WEIGHING.
5.Balances in the sortorius 2400 series allow one to determine
weight (mass) to within___________?
ANS=0.0001g
6.List the tree types of balances known to you and state the
range of their measurements??
7.The use of large flame during heating my lead to______?
8.A substance that does not burn in flame is probably a_____?
9._________are those in which a substance,usually a solid, is weighed.
ANS=GRAVIMETRIC PROCEDURES.
10.When isolation of a pure solid is difficult,or rapid filtration is necessary,_______is employed??
ANS=VACUUM FILTERATION.
11.A________is a small machine (with several test tube holder)that rotates rapidly.
ANS=centrifuge
12.Before a —— is turn on a test tube must be placed opposite the test tube of interest to prevent excessive vibration
ANS=CENTRIFUGE
13.___________is a technique employed to purify an organic solid that may be contaminated by impurities.
ANS=RECRYSTALLIZATION
14.__________of most organic compounds in common solvent increases as the temperature is increases?
ANS=SOLUBILITIES
15.dissolution are generally endothermic process.YES\NO
ANS=YES
16.What are the two conditions for selecting a desired solvent for recrystallization??
ANS=a.the solubility of the desired substances in the solvent at high temperature and b.the solubility of the impurity in the solvent at lower temperature.
b.the solvent should not react chemically with the desired substance.
17.___________is a useful method for purification and isolation, but it is restricted to solids, and it is a relatively
inefficient way to separate a mixture of very similar compounds.
ANS=CRYSTALLIZATION
18.___________is the general term for the recovery of a substance from a mixture by
bringing it into contact with a solvent that preferentially dissolves the desired material.
ANS=EXTRACTION
19.The process of extraction is concerned with the_______??
ANS=DISTRIBUTION LAW OR PARTITION LAW
20.___________prevent a sharp boundary between layers?
ANS=EMULSIONS.
Alice