Other Chemistry Answers

14 An alkane with 7 carbon atoms contains _____ hydrogen atoms.

a. 16
b. 14
c. 20
d. 18

what mass of magnesium hydroxide would be required for the magnesium hydroxide to react to the equivalence point with 558 mL of 3.18 M hydrochloric acid

A 0.77 mg sample of boron reacts with oxygen to form 2.48 mg of the oxide.

when an irregularly shaped chunk of an unknown metal, weighing 8.763g, was placed in a graduated cylinder containing 25.0ml of water, the water level in the cylinder rose to 28.76ml. what is the density of this unknown metal in g\cm3?

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

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

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

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

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 ?