BIO 1201 LSU GREGG EXAM 1 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS VERIFIED 2027 EDITION
1. made of atoms joined by bonds ex. formic acid (CH2O2)
compound
2. what determines an atoms identity?
number of protons
3. what determines an atom's ability to form bonds
electron distribution
4. Matter consists of _______ ________ in pure form and in combinations called _________
chemical elements, compounds
5. organisms are composed of ________
matter
6. ________ is anything that takes up space and has mass, made up of elements
Matter
7. substance that cannot be broken down into other substances by chemical reactions
element
8. substance consisting of two or more elements in a fixed ratio
compound
9. different
A compound has characteristics _____ from those of its elements.
10. each element consists of ________ atoms
unique
11. smallest unit of matter that still retains the properties of an element
atom
12. atoms are composed of ______________
subatomic particles
13.
neutrons(neutral), protons (+), electrons (-)
14. neutrons and protons form the _________
atomic nucleus
15. _________ form a "cloud" of negative charge around the nucelus
electrons
16. neutron mass and proton mass are almost identical and are measured in _______
daltons
1
,17. atoms of the various elements differ in number of ____________________
subatomic particles
18. an element's ______ __________ is the number of protons in its nucleus
atomic number
19. an element's ______ ____________ is the sum of protons plus neutrons in the nucleus
mass number
20. the atom's total mass, can be approximated by the mass number
atomic mass
21. all atoms of an element have the same number of protons but may differ in number of neutrons
differ
22. two atoms of an element that differ in number of neutrons
isotops
23. decay spontaneously, giving off particles and energy
radioactive isotopes
24. the ________ _____________ of an atom is determined by the distribution of electrons in electron shells
chemical behavior
25. those in the outermost shell, or _______ shell
valence electrons, valencee
26. the chemical behavior of an atom is mostly determined by the valence electrons
valence electrons
27. elements with a full valence shell are chemically inert
inert
28. the formation and function of molecules depend on ________ ________ between atoms
chemical bonding
29. atoms with __________ valence shells can share or transfer valence electrons with certain other
atoms
incomplete
30. interactions usually result in atoms staying close together, held by attractions called ________ _______
chemical bonds
31. a __________ _____ is the sharing of a pair of valence electrons by two atoms
covalent bond
32. in a covalent bond, the _______ electrons count as part of each atom's valence shell
shared
33. consists of two or more atoms held together by covalent bonds
molecule
34. the sharing of one pair of valence electrons
single covalent bond or single bond
2
, 35. sharing of two pairs of valence electrons
double covalent bond or double bond
36. the notation used to represent atoms and bonding is called a __________ ____________, ex H--H
structural formula
37. H--H can be abbreviated further with a __________ __________
molecular formula, H2
38. true or false: covalent bonds can form between atoms of the same element or atoms of different
elements
true
39. combination of two or more different elements
compound
40. atoms in a molecule _________ electrons to varying degrees
attract
41. an atom's attraction for the electrons in a covalent bond
electronegativity
42. true or false: the more electronegative and atom is, the more strongly it pulls shared electrons
toward itself
true
43. in a ________ covalent bond, the atoms share electrons EQUALLY
nonpolar
44. in a _______ covalent bond, one atom is more electronegative, and the atoms DO NOT share the
electron equally
polar
45. what causes a partial positive or negative charge for each atom or molecule
unequal sharing of electrons
46. true or false: atoms NEVER strip electrons from their bonding partners
false
47. transfer of an electron from sodium to chlorine
example of transfer from bonding partner
48. after the transfer of an electron, both atoms have _______
charges
49. charged atom or molecule
ion
50. + charged ion
cation
51. - charged ion
anion
3
CORRECT ANSWERS VERIFIED 2027 EDITION
1. made of atoms joined by bonds ex. formic acid (CH2O2)
compound
2. what determines an atoms identity?
number of protons
3. what determines an atom's ability to form bonds
electron distribution
4. Matter consists of _______ ________ in pure form and in combinations called _________
chemical elements, compounds
5. organisms are composed of ________
matter
6. ________ is anything that takes up space and has mass, made up of elements
Matter
7. substance that cannot be broken down into other substances by chemical reactions
element
8. substance consisting of two or more elements in a fixed ratio
compound
9. different
A compound has characteristics _____ from those of its elements.
10. each element consists of ________ atoms
unique
11. smallest unit of matter that still retains the properties of an element
atom
12. atoms are composed of ______________
subatomic particles
13.
neutrons(neutral), protons (+), electrons (-)
14. neutrons and protons form the _________
atomic nucleus
15. _________ form a "cloud" of negative charge around the nucelus
electrons
16. neutron mass and proton mass are almost identical and are measured in _______
daltons
1
,17. atoms of the various elements differ in number of ____________________
subatomic particles
18. an element's ______ __________ is the number of protons in its nucleus
atomic number
19. an element's ______ ____________ is the sum of protons plus neutrons in the nucleus
mass number
20. the atom's total mass, can be approximated by the mass number
atomic mass
21. all atoms of an element have the same number of protons but may differ in number of neutrons
differ
22. two atoms of an element that differ in number of neutrons
isotops
23. decay spontaneously, giving off particles and energy
radioactive isotopes
24. the ________ _____________ of an atom is determined by the distribution of electrons in electron shells
chemical behavior
25. those in the outermost shell, or _______ shell
valence electrons, valencee
26. the chemical behavior of an atom is mostly determined by the valence electrons
valence electrons
27. elements with a full valence shell are chemically inert
inert
28. the formation and function of molecules depend on ________ ________ between atoms
chemical bonding
29. atoms with __________ valence shells can share or transfer valence electrons with certain other
atoms
incomplete
30. interactions usually result in atoms staying close together, held by attractions called ________ _______
chemical bonds
31. a __________ _____ is the sharing of a pair of valence electrons by two atoms
covalent bond
32. in a covalent bond, the _______ electrons count as part of each atom's valence shell
shared
33. consists of two or more atoms held together by covalent bonds
molecule
34. the sharing of one pair of valence electrons
single covalent bond or single bond
2
, 35. sharing of two pairs of valence electrons
double covalent bond or double bond
36. the notation used to represent atoms and bonding is called a __________ ____________, ex H--H
structural formula
37. H--H can be abbreviated further with a __________ __________
molecular formula, H2
38. true or false: covalent bonds can form between atoms of the same element or atoms of different
elements
true
39. combination of two or more different elements
compound
40. atoms in a molecule _________ electrons to varying degrees
attract
41. an atom's attraction for the electrons in a covalent bond
electronegativity
42. true or false: the more electronegative and atom is, the more strongly it pulls shared electrons
toward itself
true
43. in a ________ covalent bond, the atoms share electrons EQUALLY
nonpolar
44. in a _______ covalent bond, one atom is more electronegative, and the atoms DO NOT share the
electron equally
polar
45. what causes a partial positive or negative charge for each atom or molecule
unequal sharing of electrons
46. true or false: atoms NEVER strip electrons from their bonding partners
false
47. transfer of an electron from sodium to chlorine
example of transfer from bonding partner
48. after the transfer of an electron, both atoms have _______
charges
49. charged atom or molecule
ion
50. + charged ion
cation
51. - charged ion
anion
3
