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Exam 2: Chemical Basis of Life

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Question 41

Multiple Choice

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Which of the following chemicals is NOT an inorganic substance?

A) water
B) protein
C) sodium chloride
D) carbon dioxide
E) oxygen

F) A) and B)
G) C) and D)

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Question 42

Multiple Choice

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If solution A has a pH of 6 and solution B has a pH of 3,then ________.

A) solution B has 3 times more H⁺ than A
B) solution B has 3 times less H⁺ than A
C) solution B has 30 times more H⁺ than A
D) solution B has 1000 times more H⁺ than A
E) solution B has 1000 times less H⁺ than A

F) A) and D)
G) B) and D)

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Question 43

Short Answer

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The opposite of a decomposition reaction is called a ________ reaction.

When atoms form bonds by sharing electrons,the bond formed is a type of ________ bond.

Water,salts,oxygen and proteins are all examples of inorganic substances.

The atomic weight of an atom of an element equals the number of neutrons in its nucleus.

Protons are the subatomic particles that determine an atom's bonding behavior.

Collectively,these bonds are responsible for the surface tension of water,but individually they are weak bonds.

________ are chemicals that resist pH changes.

An ________ is defined as a substance that ionizes in water.

A molecular formula represents the numbers and types of atoms in a molecule.

Proteins include DNA and RNA.

________ are the building blocks of nucleic acids.

Certain cellular organelles use oxygen to release energy from glucose.

Which of the following substances is NOT an element?

The chemical behavior of atoms results from interactions among their _________.

A solution that contains more hydrogen ions than hydroxide ions is _________.

Buffers combine with hydrogen ions when H⁺ is in excess or they donate hydroxide ions when H⁺ is depleted.

Which elements make up 95% (by weight) of the human body?

Atoms of different elements vary in size,weight and ways they interact with atoms or different elements.