Mastering Biology Assignment 1
Questions and Answers
A substance that cannot be broken down into other substances by ordinary chemical
procedures - Answer -Element
What is a trace element required by most living organisms? - Answer -Magnesium
A chemical element required only in minute amounts by living organisms for normal
growth. - Answer -Trace Element
Proton - Answer --Symbol "p"
-Charge (+1)
Neutron - Answer --Symbol "n"
-Charge (0)
Electron - Answer --Symbol "e-"
-Charge (-1)
Which of the three subatomic particles (protons, neutrons, electrons) has the smallest
mass? - Answer -Electron
Has an approximate mass of ~1amu - Answer -Proton, Neutron
Has an approximate mass of ~1/2000 amu - Answer -Electron
The innermost electron shell of an atom can hold up to how many electrons? - Answer -
2
What relationship between subatomic particles is true of an uncharged atom? - Answer
-The number of protons is equal to the number of electrons.
What determines the types of chemical reactions that an atom participates in? - Answer
-Number of electrons in the outermost electron shell
Changing the number of _____ would change an atom into an atom of a different
element. - Answer -Protons
, The atoms of different phosphorus isotopes _____. - Answer -Isotopes
Each of two or more forms of the same element that contain equal numbers of protons
but different numbers of neutrons in their nuclei, and hence differ in relative atomic
mass but not in chemical properties; in particular, a radioactive form of an element. -
Answer -Isotope
What determines the type of bonding and the numbers of covalent bonds an atom can
form with other atoms? - Answer -Number of unpaired electrons in the outer valence
shell
In what way are elements in the same column of the periodic table the same? - Answer
-They have the same number of electrons in their valence shells when neutral
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than
nitrogen-14 because the atomic nucleus of nitrogen-15 contains _____. - Answer -8
neutrons
What correctly describes a reaction that has reached chemical equilibrium? - Answer -
The rate of the forward reaction is equal to the rate of the reverse reaction.
What type of bond is joins two hydrogen atoms? - Answer -Covalent
Covalent Bond - Answer -A chemical bond in which two atoms share one or more pairs
of valence electrons.
Molecule - Answer -Two or more atoms held together by covalent bonds.
What kind of bond bonds two Oxygen atoms together - Answer -Double Covalent Bond
What correctly describes the nature of the bonding of H2O? - Answer -Oxygen is more
electronegative than hydrogen, making it negatively charged while the two hydrogen
atoms carry partial positive charges
What type of bond joins a carbon atom to 4 hydrogen atoms? - Answer -Single
Nonpolar Covalent Bond
Ionic Bond - Answer -A chemical bond resulting from the attraction between atoms that
have acquired a charge due to losing or gaining one or more electrons.
When is Chemical Equilibrium reached? - Answer -The forward and reverse reactions
occur at the same rate so that the concentrations of reactants and products remain the
samwe
What attracts water molecules to one another? - Answer -Hydrogen Bonds
Questions and Answers
A substance that cannot be broken down into other substances by ordinary chemical
procedures - Answer -Element
What is a trace element required by most living organisms? - Answer -Magnesium
A chemical element required only in minute amounts by living organisms for normal
growth. - Answer -Trace Element
Proton - Answer --Symbol "p"
-Charge (+1)
Neutron - Answer --Symbol "n"
-Charge (0)
Electron - Answer --Symbol "e-"
-Charge (-1)
Which of the three subatomic particles (protons, neutrons, electrons) has the smallest
mass? - Answer -Electron
Has an approximate mass of ~1amu - Answer -Proton, Neutron
Has an approximate mass of ~1/2000 amu - Answer -Electron
The innermost electron shell of an atom can hold up to how many electrons? - Answer -
2
What relationship between subatomic particles is true of an uncharged atom? - Answer
-The number of protons is equal to the number of electrons.
What determines the types of chemical reactions that an atom participates in? - Answer
-Number of electrons in the outermost electron shell
Changing the number of _____ would change an atom into an atom of a different
element. - Answer -Protons
, The atoms of different phosphorus isotopes _____. - Answer -Isotopes
Each of two or more forms of the same element that contain equal numbers of protons
but different numbers of neutrons in their nuclei, and hence differ in relative atomic
mass but not in chemical properties; in particular, a radioactive form of an element. -
Answer -Isotope
What determines the type of bonding and the numbers of covalent bonds an atom can
form with other atoms? - Answer -Number of unpaired electrons in the outer valence
shell
In what way are elements in the same column of the periodic table the same? - Answer
-They have the same number of electrons in their valence shells when neutral
The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than
nitrogen-14 because the atomic nucleus of nitrogen-15 contains _____. - Answer -8
neutrons
What correctly describes a reaction that has reached chemical equilibrium? - Answer -
The rate of the forward reaction is equal to the rate of the reverse reaction.
What type of bond is joins two hydrogen atoms? - Answer -Covalent
Covalent Bond - Answer -A chemical bond in which two atoms share one or more pairs
of valence electrons.
Molecule - Answer -Two or more atoms held together by covalent bonds.
What kind of bond bonds two Oxygen atoms together - Answer -Double Covalent Bond
What correctly describes the nature of the bonding of H2O? - Answer -Oxygen is more
electronegative than hydrogen, making it negatively charged while the two hydrogen
atoms carry partial positive charges
What type of bond joins a carbon atom to 4 hydrogen atoms? - Answer -Single
Nonpolar Covalent Bond
Ionic Bond - Answer -A chemical bond resulting from the attraction between atoms that
have acquired a charge due to losing or gaining one or more electrons.
When is Chemical Equilibrium reached? - Answer -The forward and reverse reactions
occur at the same rate so that the concentrations of reactants and products remain the
samwe
What attracts water molecules to one another? - Answer -Hydrogen Bonds
