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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
Show/Hide Answers
Environmental Chemistry: Water
What is the total amount of water present on Earth?
1.33 billion cubic kilometers
1.33 billion cubic meters
1.33 million cubic kilometers
1.33 million cubic meters
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Hydrocarbons
Which of the following is given off during ripening fruits and vegetables?
ethane
ethene
Ethyne
methane
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Comment
Environmental Chemistry: Water
Temporary hardness can be removed by adding
lime
carbon
oxygen
slaked lime
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Biochemistry Introduction
Which of the following is included in water-soluble vitamins?
vitamin A and D
vitamin A and K
vitamin B and C
vitamin A and B
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Chemical Equilibrium
The reactions in which reactants react to form products and simultaneously products reverse back into reactants are called
reversible reactions
irreversible reaction
spontaneous reactions
non spontaneous reactions
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Organic Chemistry
How many bonds are formed by carbon with other atoms?
two
three
four
five
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Organic Chemistry
The rate of reaction of organic compounds is slow due to
ionic bonding
amphoteric nature
covalent bonding
coordinate covalent bonding
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Comment
Environmental Chemistry: Atmosphere
Which two main gases are produced when you burn a piece of wood?
oxygen and nitrogen
carbon dioxide and oxygen
carbon dioxide and carbon monoxide
carbon dioxide and nitrogen
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Biochemistry Introduction
Which of the following causes a feeling of pressure inside the head when taken in excess amount?
vitamin A
vitamin B
vitamin C
vitamin D
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Biochemistry Introduction
Vitamin K is necessary for
eyes and skin
energy production in cells
antioxidant
blood clotting
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