CHM192: introductory chemistry practical II TMA1

Question 1 Shortly before the melting point of some solid the solid tend to get smaller this process is called?

Answer is sintering

Question 2

I. Aromatic

II. Alkanes

III. Alkenes,

Which of the above compounds reacts with concentrated sulphuric acid?

Answer is III. Alkene

Question 3 the reaction between unsaturated hydrocarbons and potassium permanganate is?

Answer is oxidation

Question 4which of these is true?

Answer is soluble impurities tend to lower the observed melting point

Question 5 if you are to extract fats from milk the solvent to be used is expected to be?

Boil at a low temperature

None of the above

All of the above

Almost infallible Insoluble in water

Answer is none of the above

Question 6 cyclobutane is a square and is _____off shape?

Answer is Geometric

Question 7 for alcohol to be obtained from alkenes alkenes must be?

Answer is hydrated

Question 8 bromine water is added to hydrocarbon X, if if the red colour bromine remains X could be?

Answer is alkane

Question 9 the reactions of hydrocarbon y with bromine water to give colourless solution could be said to be _______reaction?

Answer is neutralization

Question 10________ is the process of losing a water molecule from alcohol compound?

Answer is dehydration

Question 11 compound with the same molecular formula but different structure have____?

Answer is different physical but the same chemical property

Question 12 which of these solvents boil at a higher temperature?

Answer is ethyl acetate

Question 13 a compound x react with potassium permanganate to form brown precipitate Y, Y and X may likely be?

Answer is alkene and manganous oxide

Question 14 a mixture of two compound with the least melting point is called_______ mixture?

Answer is entetic

Question 15

I. Benzoic acid

II. Benzoin

III. Benzophenone

IV. Benzyhydrol

Arrange the following in the order of increasing melting point?

Answer is III,IV,I,II

Question 16 when heat is applied to some solid few degrees below their true melting point the solid begin to____?

Answer is sweat

Question 17 introduction of impurity _____the melting point of solid?

Answer is lower

Question 18 it is advisable to use concentrated hydrochloric acid in the_________?

Answer is fume hood

question 19 ethanol uses 1 water molecule to form compound X,X could likely be?

Answer is ethane

Question 20

I. Melt

II. Shrinks

III. Sublime. Which of the above occur to a solid when heated?

Answer is I,II,III,IV