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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 02: The Chemical Foundation of Life
2.1 Atoms, Isotopes, Ions, and Molecules: The Building Blocks
2.2 Water
2.3 Carbon
Download MCQ Quiz PDF eBook
Question: When acids are added to a solution, the pH should ________.
Choices:
decrease
increase
stay the same
cannot tell without testing
Question: Which of the following statements is true?
Choices:
Acids and bases cannot mix together.
Acids and bases will neutralize each other.
Acids, but not bases, can change the pH of a solution.
Acids donate hydroxide ions (OH-); bases donate hydrogen ions (H+).
Question: Which of the following statements is not true?
Choices:
Water is polar.
Water stabilizes temperature.
Water is essential for life.
Water is the most abundant molecule in the Earth's atmosphere.
Question: Potassium has an atomic number of 19. What is its electron configuration?
Choices:
shells 1 and 2 are full, and shell 3 has nine electrons
shells 1, 2 and 3 are full and shell 4 has three electrons
shells 1, 2 and 3 are full and shell 4 has one electron
shells 1, 2 and 3 are full and no other electrons are present
Question: If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?
Choices:
54
27
100
108
Question: Which of the following is not a functional group that can bond with carbon?
Choices:
sodium
hydroxyl
phosphate
carbonyl
Question: Which type of bond represents a weak chemical bond?
Choices:
hydrogen bond
atomic bond
covalent bond
nonpolar covalent bond
Question: A molecule that binds up excess hydrogen ions in a solution is called a(n) ________.
Choices:
acid
isotope
base
donator
Question: Each carbon molecule can bond with as many as________ other atom(s) or molecule(s).
Choices:
one
two
six
four
Question: Atoms that vary in the number of neutrons found in their nuclei are called ________.
Choices:
ions
neutrons
neutral atoms
isotopes
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