Biology 1201 Exam 1 Actual Exam
Study Questions with Expert Graded
A+ Answers | Brand New Version
1. About 25 of the 92 natural elements are known to be essential to life. Which
four of these 25 elements make up approximately 96% of living matter? -
ANSWER Carbon, Hydrogen, Nitrogen, Oxygen
2. What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6
electrons? - ANSWER 6
3. Which of these refers to atoms with the same atomic number but different
atomic masses? - ANSWER Isotopes
4. Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons
does fluorine have? - ANSWER 10
5. Hydrogen bonding is most often seen _____. - ANSWER when hydrogen is
covalently bonded to an electronegative atom
6. Many of water's emergent properties, such as its cohesion, its high specific
heat, and its high heat of vaporization, result from the fact that water
molecules _____. - ANSWER are attracted to each other by partial negative
and positive charges on the oxygen and hydrogen atoms, respectively
7. Because organisms are made primarily of water, they resist rapid
temperature changes. This useful quality is based on water's _____. -
ANSWER High specific heat
,8. The smallest unit of an element that retains all of the properties of that
element is: - ANSWER an atom
9. From its atomic number of 15, it is possible to predict that phosphorus
always has: - ANSWER 15 protons
10.An atom with the atomic number 9 will have _______ electrons in its
outermost electron shell - ANSWER 7
11.True or False, an atom with more neutrons than the atom described in the
question above will have a different valence. - ANSWER False
12.True or False, based on the atom described in the question above, the
valence of that atom is 1 - ANSWER False
13.An atom with the atomic number 15 has a valence of? - ANSWER 3
14.An acid is a substance that _____ - ANSWER increases the hydrogen ion
concentration of an aqueous solution
15.A pH of 6 is how many times more acidic than a pH of 9? - ANSWER
1,000
16.What is the arrow pointing to? - ANSWER Hydrogen ion
17.What is the arrow pointing to? - ANSWER Hydroxide ion
,18.In a neutral solution the concentration of _____ - ANSWER hydrogen ions
is equal to the concentration of hydroxide ions
19.An uncharged atom of boron has an atomic number of 5 and an atomic mass
of 11. How many protons does boron have? - ANSWER 5
20.Atoms with the same number of protons but with different electrical charges
_____. - ANSWER Are different ions
21.In salt, what is the nature of the bond between sodium and chlorine? -
ANSWER Ionic
22.What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl -
ANSWER a positively charged sodium ion and a negatively charged chlorine
ion
23.An ionic bond involves _____. - ANSWER an attraction between ions of
opposite charge
24.What type of bond is joining the two hydrogen atoms? - ANSWER
Covalent
25.A(n) _____ refers to two or more atoms held together by covalent bonds. -
ANSWER molecule
26.This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons - ANSWER 4
, 27.A(n) _____ bond joins these two oxygen atoms. - ANSWER A double
covalent bond
28.The brackets are indicating a(n) _____ bond. - ANSWER hydrogen bond
29.What name is given to the bond between water molecules? - ANSWER
hydrogen
30.Which of these figures correctly illustrates the nature of the bonding of
H2O? - ANSWER
31.What type of bond joins the carbon atom to each of the hydrogen atoms? -
ANSWER Single (nonpolar) covalent
32.A substance that cannot be broken down into other substances by ordinary
chemical procedures is a(n) _____. - ANSWER element
33.Which of the following subatomic particles always has a positive charge? -
ANSWER proton
34.Changing the number of _____ would change an atom into an atom of a
different element. - ANSWER protons
35.How does the pH of the solution on the right compare with that of the
solution on the left? - ANSWER The solution on the right is basic relative
to the solution on the left.
Study Questions with Expert Graded
A+ Answers | Brand New Version
1. About 25 of the 92 natural elements are known to be essential to life. Which
four of these 25 elements make up approximately 96% of living matter? -
ANSWER Carbon, Hydrogen, Nitrogen, Oxygen
2. What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6
electrons? - ANSWER 6
3. Which of these refers to atoms with the same atomic number but different
atomic masses? - ANSWER Isotopes
4. Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons
does fluorine have? - ANSWER 10
5. Hydrogen bonding is most often seen _____. - ANSWER when hydrogen is
covalently bonded to an electronegative atom
6. Many of water's emergent properties, such as its cohesion, its high specific
heat, and its high heat of vaporization, result from the fact that water
molecules _____. - ANSWER are attracted to each other by partial negative
and positive charges on the oxygen and hydrogen atoms, respectively
7. Because organisms are made primarily of water, they resist rapid
temperature changes. This useful quality is based on water's _____. -
ANSWER High specific heat
,8. The smallest unit of an element that retains all of the properties of that
element is: - ANSWER an atom
9. From its atomic number of 15, it is possible to predict that phosphorus
always has: - ANSWER 15 protons
10.An atom with the atomic number 9 will have _______ electrons in its
outermost electron shell - ANSWER 7
11.True or False, an atom with more neutrons than the atom described in the
question above will have a different valence. - ANSWER False
12.True or False, based on the atom described in the question above, the
valence of that atom is 1 - ANSWER False
13.An atom with the atomic number 15 has a valence of? - ANSWER 3
14.An acid is a substance that _____ - ANSWER increases the hydrogen ion
concentration of an aqueous solution
15.A pH of 6 is how many times more acidic than a pH of 9? - ANSWER
1,000
16.What is the arrow pointing to? - ANSWER Hydrogen ion
17.What is the arrow pointing to? - ANSWER Hydroxide ion
,18.In a neutral solution the concentration of _____ - ANSWER hydrogen ions
is equal to the concentration of hydroxide ions
19.An uncharged atom of boron has an atomic number of 5 and an atomic mass
of 11. How many protons does boron have? - ANSWER 5
20.Atoms with the same number of protons but with different electrical charges
_____. - ANSWER Are different ions
21.In salt, what is the nature of the bond between sodium and chlorine? -
ANSWER Ionic
22.What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl -
ANSWER a positively charged sodium ion and a negatively charged chlorine
ion
23.An ionic bond involves _____. - ANSWER an attraction between ions of
opposite charge
24.What type of bond is joining the two hydrogen atoms? - ANSWER
Covalent
25.A(n) _____ refers to two or more atoms held together by covalent bonds. -
ANSWER molecule
26.This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons - ANSWER 4
, 27.A(n) _____ bond joins these two oxygen atoms. - ANSWER A double
covalent bond
28.The brackets are indicating a(n) _____ bond. - ANSWER hydrogen bond
29.What name is given to the bond between water molecules? - ANSWER
hydrogen
30.Which of these figures correctly illustrates the nature of the bonding of
H2O? - ANSWER
31.What type of bond joins the carbon atom to each of the hydrogen atoms? -
ANSWER Single (nonpolar) covalent
32.A substance that cannot be broken down into other substances by ordinary
chemical procedures is a(n) _____. - ANSWER element
33.Which of the following subatomic particles always has a positive charge? -
ANSWER proton
34.Changing the number of _____ would change an atom into an atom of a
different element. - ANSWER protons
35.How does the pH of the solution on the right compare with that of the
solution on the left? - ANSWER The solution on the right is basic relative
to the solution on the left.
