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Chemistry
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Acids Bases and Salts
23
Biochemistry Introduction
217
Characteristics of Acids Bases and Salts
114
Chemical Industries
66
Environmental Chemistry: Atmosphere
95
Environmental Chemistry: Water
61
Chemical Equilibrium
46
Hydrocarbons
86
Organic Chemistry
92
The Atmosphere
25
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Chemistry
Which of the following law states, matter can neither created nor destroyed during a chemical reaction?
Constant proportion
Conservation of mass
Disproportion
Invisible particles
The Law of Conservation of Mass dates from Antoine Lavoisier`s 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
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Environmental Chemistry: Atmosphere
Which of the following is the first layer of atmosphere as one moves upwards from the Earth's surface?
troposphere
stratosphere
mesosphere
thermosphere
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Biochemistry Introduction
Which of the following is included in fat-soluble vitamins?
vitamin A and C
vitamin A, D, E, and K
vitamin B and C
vitamin A and B
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The Atmosphere
The mass of atmosphere contained in the troposphere is about
10-20%
75-80%
90-100%
50-60%
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Hydrocarbons
Which of the following is not true about alkynes?
they are unsaturated hydrocarbons
they are saturated hydrocarbons
they are non-polar
they dissolve readily in organic solvents
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Biochemistry Introduction
Which of the following is used in the form of wood for heat, housing, and furniture?
cellulose
starch
monosaccharides
oligosaccharides
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Environmental Chemistry: Atmosphere
Which of the following causes headache and dizziness and can even cause death if inhaled for a long time?
sulphur dioxide
carbon dioxide
nitrogen dioxide
carbon monoxide
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Environmental Chemistry: Atmosphere
Which of the following is true about nitric oxide?
it is colorless
it has an irritating odor
it is not toxic
it is not harmful
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Hydrocarbons
Which alkanes are widely used as fuel?
lighter alkanes
heavier alkanes
all the alkanes
alkenes
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Hydrocarbons
Considering the process of reduction of alkyl halides, which of the following is liberated when Zn reacts with aqueous acid?
hydrogen gas
nascent hydrogen
oxygen
carbon atoms
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