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13 What is the boiling point of ethanol at 720 mm Hg when its normal point at 760 mm Hg is known to be 78.3 o C
a) 75.3oC
b) 76.3oC
c) −3oC
d) −2oC
17 What is the effect of a small amount of impurity on the melting point of an organic compound?
a) Decreases melting point
d) Elevates melting point
d) Stagnates melting point
c) None of the above
18 You are given a bottle that contains 4.59 cm3 of a metallic solid. The total mass of the bottle is 35.66 g. The empty bottle weighs 14.23 g, what is the density of the solid?
a) 4.67 g/cm3
b) 8.94 g/cm3
c) 3.1 g/cm3
d) None of the above
a) 75.3oC
b) 76.3oC
c) −3oC
d) −2oC
17 What is the effect of a small amount of impurity on the melting point of an organic compound?
a) Decreases melting point
d) Elevates melting point
d) Stagnates melting point
c) None of the above
18 You are given a bottle that contains 4.59 cm3 of a metallic solid. The total mass of the bottle is 35.66 g. The empty bottle weighs 14.23 g, what is the density of the solid?
a) 4.67 g/cm3
b) 8.94 g/cm3
c) 3.1 g/cm3
d) None of the above
18 Breaking of a larger hydrocarbon molecule into a smaller one by heating in the presence of a catalyst is called ___.
a. Cracking
b. Orthofugation
c. Centrifugation
d. Thermogenation
19 An isomer of pentane is ___________.
a. 2,2-Dimethylpropane
b. 2,2-Dimethylpentane
c. 1,1-Dimethylcyclopropane
d. 2,3-Dimethylbutane
20 Isomers have the same _____________.
a. Melting point
b. Molecular formula
c. Boiling point
d. Reactivity
a. Cracking
b. Orthofugation
c. Centrifugation
d. Thermogenation
19 An isomer of pentane is ___________.
a. 2,2-Dimethylpropane
b. 2,2-Dimethylpentane
c. 1,1-Dimethylcyclopropane
d. 2,3-Dimethylbutane
20 Isomers have the same _____________.
a. Melting point
b. Molecular formula
c. Boiling point
d. Reactivity
19 An isomer of pentane is ___________.
a) 2,2-Dimethylpropane
b) 2,2-Dimethylpentane
c) 1,1-Dimethylcyclopropane
d) 2,3-Dimethylbutane
20 Isomers have the same _____________.
a. Melting point
b. Molecular formula
c. Boiling point
d. Reactivity
a) 2,2-Dimethylpropane
b) 2,2-Dimethylpentane
c) 1,1-Dimethylcyclopropane
d) 2,3-Dimethylbutane
20 Isomers have the same _____________.
a. Melting point
b. Molecular formula
c. Boiling point
d. Reactivity
16 Ethyne gas may be tested for saturation in the laboratory. Which of these is a positive test?
a. It changes the colour of cobalt chloride paper from blue to pink
b. It changes the colour of bromine water from red to blue
c. It turns lime water milky
d. It decolorizes acidified potassium permanganate solution.
18 Breaking of a larger hydrocarbon molecule into a smaller one by heating in the presence of a catalyst is called ___.
a. Cracking
b. Orthofugation
c. Centrifugation
d. Thermogenation
a. It changes the colour of cobalt chloride paper from blue to pink
b. It changes the colour of bromine water from red to blue
c. It turns lime water milky
d. It decolorizes acidified potassium permanganate solution.
18 Breaking of a larger hydrocarbon molecule into a smaller one by heating in the presence of a catalyst is called ___.
a. Cracking
b. Orthofugation
c. Centrifugation
d. Thermogenation
What volume of 1.75% (w/v) glucose can be prepared from 500g of glucose?
the mass of an atom of chlorine-35 is 5.807 g and that of an atom of chlorine-37 is 6.139 g. in a typical natural sample of chlorine, 75.77% of the sample is chlorine-35 and 24.23% is chlorine-37. what is the molar mass of a typical sample of chlorine ?
The density of ethanol is 0.789g/mL. What is the mass of 40.0mL of ethanol?
sanitary land fill is a
How many atoms are in 0.50 moles of potassium?
A 1.000-g sample of pure organic compound was allowed to react with excess Na2O3 to form NaCl. The resulting sample was precipitated with excess AgNO3 giving 1.950 AgCl. If the MW of the compound is 147, how many Chlorine atom does each molecule contain?
