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Exam 2: The Chemistry of Life

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Question 21

Multiple Choice

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In a covalent bond

A) atoms share electrons.
B) atoms of opposite charges attract each other.
C) atoms share protons.
D) atoms share neutrons.
E) atoms are repelled by each other.

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Question 22

Multiple Choice

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A substance with a pH of 7 is

A) a weak acid.
B) a weak base.
C) neutral.
D) a strong acid.
E) a strong base.

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Question 23

Multiple Choice

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The atomic number of an atom or element is the number of

Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died to within 60,000 years. The atomic numbers of C is 6 and of N is 7. -¹⁴C and ¹⁴N have the same

Hydrogen,nitrogen,carbon,and oxygen account for 96% of the human body.These elements are

Water is best described as which of the following?

Blood is closely maintained at a pH of 7.4.A patient whose blood pH drops below 7.35 is suffering from metabolic acidosis and can go into a coma.What happens to the concentration of H⁺ ions in a patient with a blood pH of 6.4?

Within a single molecule of water,________ bonds form between oxygen and hydrogen.

If a carbohydrate polymer contains only two monomer units,such as sucrose made from glucose and fructose,it is called a(n)

If you were told to sort cards into boxes after a lab on elements,you would put into a slot labelled "Mass Number" any card with text that included the total number of

What do a lemon,a toaster oven,and sand grains have in common?

Organic molecules are defined as chemical compounds that contain

As part of a lab practical,you need to attach labels about chemical models.For the bond between amino acids,you would add a label describing that it is 

Isotopes of the same element are different from one another in that

An acid

You encounter a new compound that is bright purple and smells of violets.It sticks to surfaces in a way similar to water and can replace water in the running of living cells.You might expect that this new molecule will make 

Which statement about a bond between sodium and chlorine is incorrect?

For most atoms,the outermost electron shell would be full if it contained

Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died to within 60,000 years. The atomic numbers of C is 6 and of N is 7. -The most common isotope of carbon is ¹²C.¹⁴C has ____ than ¹²C.

Evaporation is