Question 1

A base ________.

Accepted Answer

A) removes H2O molecules from a solution 
B) decreases the pH of a solution 
C) removes OH− from a solution 
D) removes H+ from a solution 
A) removes H2O molecules from a solution 
B) decreases the pH of a solution 
C) removes OH− from a solution 
D) removes H+ from a solution D

Question 2

Consider the following reaction. What type of bond is holding the two atoms together? K + Br → K+ + Br− → KBr

Accepted Answer

A) covalent 
B) ionic 
C) hydrogen 
A) covalent 
B) ionic 
C) hydrogen B

Question 3

The bond between oppositely charged ions is a(n)________ bond.

Accepted Answer

A) ionic 
B) polar 
C) hydrogen 
D) covalent 
A) ionic 
B) polar 
C) hydrogen 
D) covalent A

Question 4

How can radiation be controlled and safely used in medicine?

Accepted Answer

A) Apply radiation throughout the body at uncontrolled doses. 
B) Apply radiation throughout the body at controlled doses. 
C) Apply radiation to specific parts of the body at uncontrolled doses. 
D) Apply radiation to specific parts of the body at controlled doses. 
A) Apply radiation throughout the body at uncontrolled doses. 
B) Apply radiation throughout the body at controlled doses. 
C) Apply radiation to specific parts of the body at uncontrolled doses. 
D) Apply radiation to specific parts of the body at controlled doses.

Question 5

A fossil was found and determined by radiometric dating to be 11,400 years old. What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?

Accepted Answer

A) 12.5% 
B) 25% 
C) 37.5% 
D) 50% 
A) 12.5% 
B) 25% 
C) 37.5% 
D) 50%

Question 6

How do radioactive isotopes differ from isotopes?

Accepted Answer

A) Radioactive isotopes have more neutrons than do isotopes. 
B) Radioactive isotopes are stable; isotopes are unstable. 
C) Radioactive isotopes have fewer neutrons than do isotopes. 
D) Radioactive isotopes are unstable; isotopes are stable. 
A) Radioactive isotopes have more neutrons than do isotopes. 
B) Radioactive isotopes are stable; isotopes are unstable. 
C) Radioactive isotopes have fewer neutrons than do isotopes. 
D) Radioactive isotopes are unstable; isotopes are stable.

Question 7

All atoms of an element have the same number of ________.

Accepted Answer

A) protons plus neutrons 
B) protons 
C) electrons 
D) neutrons 
A) protons plus neutrons 
B) protons 
C) electrons 
D) neutrons

Question 8

An atom's ________ are found in its nucleus.

Accepted Answer

A) neutrons and protons 
B) protons only 
C) neutrons and electrons 
D) electrons, protons, and neutrons 
A) neutrons and protons 
B) protons only 
C) neutrons and electrons 
D) electrons, protons, and neutrons

Question 9

In order to have a positive charge, an atom must have ________.

Accepted Answer

A) more protons than electrons 
B) more electrons than protons 
C) more neutrons than protons 
D) more protons than neutrons 
A) more protons than electrons 
B) more electrons than protons 
C) more neutrons than protons 
D) more protons than neutrons

Question 10

An atom with an electrical charge is a(n)________.

Accepted Answer

A) isotope 
B) molecule 
C) ion 
D) compound 
A) isotope 
B) molecule 
C) ion 
D) compound

Question 11

Scenario
Please read the following scenario to answer the following questions.
The last few miles of the marathon are the most difficult for Heather. Her hair is plastered to her head, sweat clings to her arms, and her legs feel as if they had nothing left. Heather grabs a cup of ice water. The ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. Then a breeze kicks up and she finally feels some coolness against her skin. Drops of sweat, once clinging to her forehead, now spill down, and Heather feels a stinging as the sweat flows into her eyes.
-Why did the sweat on Heather's forehead and arms form drops?

Accepted Answer

A) because of the high salt content of sweat 
B) because of the cohesive nature of water 
C) because of the ability of water to moderate heat 
D) because of the high evaporative cooling effect of water 
A) because of the high salt content of sweat 
B) because of the cohesive nature of water 
C) because of the ability of water to moderate heat 
D) because of the high evaporative cooling effect of water

Question 12

What name is given to bonds that involve the sharing of electrons?

Accepted Answer

A) covalent 
B) hydrogen 
C) ionic 
D) polar 
A) covalent 
B) hydrogen 
C) ionic 
D) polar

Question 13

As water freezes, ________.

Accepted Answer

A) its molecules move farther apart 
B) it cools the surrounding environment 
C) its hydrogen bonds break apart 
D) the water molecules become less polar 
A) its molecules move farther apart 
B) it cools the surrounding environment 
C) its hydrogen bonds break apart 
D) the water molecules become less polar

Question 14

In the following figure, all of the representations EXCEPT one clearly show double bonds for the oxygen molecule. Choose the exception.

Accepted Answer

A) electron configuration 
B) structural formula 
C) space-filling model 
D) ball-and-stick model 
A) electron configuration 
B) structural formula 
C) space-filling model 
D) ball-and-stick model

Question 15

What type of cancer is treated with radioactive iodine seeds?

Accepted Answer

A) breast 
B) lung 
C) prostate 
D) skin 
A) breast 
B) lung 
C) prostate 
D) skin

Question 16

Relative to a pH of 7, a pH of 4 has a ________.

Accepted Answer

A) 3,000 times higher H+ concentration 
B) 1,000 times higher H+ concentration 
C) 300 times higher H+ concentration 
D) 100 times lower H+ concentration 
A) 3,000 times higher H+ concentration 
B) 1,000 times higher H+ concentration 
C) 300 times higher H+ concentration 
D) 100 times lower H+ concentration

Question 17

When a base is added to a buffered solution, the buffer will ________.

Accepted Answer

A) donate OH− 
B) accept water molecules 
C) donate H+ ions 
D) form covalent bonds with the base 
A) donate OH− 
B) accept water molecules 
C) donate H+ ions 
D) form covalent bonds with the base

Question 18

Human body cells are approximately ________ water.

Accepted Answer

A) 95-99% 
B) 25-35% 
C) 50-55% 
D) 70-95% 
A) 95-99% 
B) 25-35% 
C) 50-55% 
D) 70-95%

Question 19

Radiometric dating is based on ________.

Accepted Answer

A) the number of electrons in atoms 
B) the decay of radioactive isotopes 
C) the strength of bonds holding together atoms 
D) the rates of chemical reactions 
A) the number of electrons in atoms 
B) the decay of radioactive isotopes 
C) the strength of bonds holding together atoms 
D) the rates of chemical reactions

Question 20

The tendency of molecules of the same kind to stick together is called ________.

Accepted Answer

A) bonding 
B) cohesion 
C) polarity 
D) adhesion 
A) bonding 
B) cohesion 
C) polarity 
D) adhesion

Exam 2: Essential Chemistry for Biology

A base ________.

Consider the following reaction. What type of bond is holding the two atoms together? K + Br → K+ + Br− → KBr

The bond between oppositely charged ions is a(n)________ bond.

How can radiation be controlled and safely used in medicine?

A fossil was found and determined by radiometric dating to be 11,400 years old. What is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?

How do radioactive isotopes differ from isotopes?

All atoms of an element have the same number of ________.

An atom's ________ are found in its nucleus.

In order to have a positive charge, an atom must have ________.

An atom with an electrical charge is a(n)________.

What name is given to bonds that involve the sharing of electrons?

As water freezes, ________.

In the following figure, all of the representations EXCEPT one clearly show double bonds for the oxygen molecule. Choose the exception.

What type of cancer is treated with radioactive iodine seeds?

Relative to a pH of 7, a pH of 4 has a ________.

When a base is added to a buffered solution, the buffer will ________.

Human body cells are approximately ________ water.

Radiometric dating is based on ________.

The tendency of molecules of the same kind to stick together is called ________.

Learning About Life

The Molecules of Life

A Tour of the Cell

The Working Cell

Cellular Respiration: Obtaining Energy From Food

Photosynthesis: Using Light to Make Food

Cellular Reproduction: Cells From Cells

Patterns of Inheritance

The Structure and Function of Dna

How Genes Are Controlled

Dna Technology

How Populations Evolve

How Biological Diversity Evolves

The Evolution of Microbial Life

The Evolution of Plants and Fungi

The Evolution of Animals

An Introduction to Ecology and the Biosphere

Population Ecology

Communities and Ecosystems

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Circulation and Respiration

The Bodys Defenses

Hormones

Reproduction and Development

Nervous, Sensory, and Locomotor Systems

The Life of a Flowering Plant

The Working Plant

Filters

Consider the following reaction. What type of bond is holding the two atoms together? K + Br → K⁺ + Br⁻ → KBr