Biology 1201 Exam 1 Questions With Verified
Answers
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?
Carbon, Hydrogen, Nitrogen, Oxygen
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
6
.Which of these refers to atoms with the same atomic number but different atomic masses?
Isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?
10
.An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have?
5
.Atoms with the same number of protons but with different electrical charges _____.
Are different ions
.In salt, what is the nature of the bond between sodium and chlorine?
Ionic
What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl
a positively charged sodium ion and a negatively charged chlorine ion
An ionic bond involves _____.
an attraction between ions of opposite charge
What type of bond is joining the two hydrogen atoms?
Covalent
A(n) _____ refers to two or more atoms held together by covalent bonds.
molecule
This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons
4
A(n) _____ bond joins these two oxygen atoms.
A double covalent bond
, The brackets are indicating a(n) _____ bond.
hydrogen bond
What name is given to the bond between water molecules?
hydrogen
Which of these figures correctly illustrates the nature of the bonding of H2O?
What type of bond joins the carbon atom to each of the hydrogen atoms?
Single (nonpolar) covalent
A substance that cannot be broken down into other substances by ordinary chemical procedures is
a(n) _____.
element
Which of the following subatomic particles always has a positive charge?
proton
Changing the number of _____ would change an atom into an atom of a different element.
protons
Hydrogen bonding is most often seen _____.
when hydrogen is covalently bonded to an electronegative atom
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 _____.
are attracted to each other by partial negative and positive charges on the oxygen and hydrogen
atoms, respectively
Because organisms are made primarily of water, they resist rapid temperature changes. This useful
quality is based on water's _____.
High specific heat
The smallest unit of an element that retains all of the properties of that element is:
an atom
From its atomic number of 15, it is possible to predict that phosphorus always has:
15 protons
An atom with the atomic number 9 will have _______ electrons in its outermost electron shell
7
Answers
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?
Carbon, Hydrogen, Nitrogen, Oxygen
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
6
.Which of these refers to atoms with the same atomic number but different atomic masses?
Isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?
10
.An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have?
5
.Atoms with the same number of protons but with different electrical charges _____.
Are different ions
.In salt, what is the nature of the bond between sodium and chlorine?
Ionic
What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl
a positively charged sodium ion and a negatively charged chlorine ion
An ionic bond involves _____.
an attraction between ions of opposite charge
What type of bond is joining the two hydrogen atoms?
Covalent
A(n) _____ refers to two or more atoms held together by covalent bonds.
molecule
This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons
4
A(n) _____ bond joins these two oxygen atoms.
A double covalent bond
, The brackets are indicating a(n) _____ bond.
hydrogen bond
What name is given to the bond between water molecules?
hydrogen
Which of these figures correctly illustrates the nature of the bonding of H2O?
What type of bond joins the carbon atom to each of the hydrogen atoms?
Single (nonpolar) covalent
A substance that cannot be broken down into other substances by ordinary chemical procedures is
a(n) _____.
element
Which of the following subatomic particles always has a positive charge?
proton
Changing the number of _____ would change an atom into an atom of a different element.
protons
Hydrogen bonding is most often seen _____.
when hydrogen is covalently bonded to an electronegative atom
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 _____.
are attracted to each other by partial negative and positive charges on the oxygen and hydrogen
atoms, respectively
Because organisms are made primarily of water, they resist rapid temperature changes. This useful
quality is based on water's _____.
High specific heat
The smallest unit of an element that retains all of the properties of that element is:
an atom
From its atomic number of 15, it is possible to predict that phosphorus always has:
15 protons
An atom with the atomic number 9 will have _______ electrons in its outermost electron shell
7
