DBIA EXAM 1, EXAM 2 AND EXAM 3 NEWEST 2024
ACTUAL EXAM COMPLETE 500 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+
The atomic number is equal to __________.
A. the sum of protons and neutrons
B. the number of nucleons
C. the number of neutrons
D. the number of protons - ANSWER: D
A species has 18 electrons, 17 neutrons and 16 protons. The species is __________.
A. superscript 34, Cl, 2- charge
B. superscript 33, S, 2+ charge
C. superscript 33, S, 2- charge
D. superscript 35, S, 2- charge - ANSWER: C
Sodium chloride (NaCl) is 39.3% Na by mass. In a 418 g sample of NaCl, how many
grams of chlorine are present?
A. 254 g
B. 83.6 g
C. 140.8 g
D. 235 g - ANSWER: A
How is the term "mass number" defined for a given atom for isotope?
A. as the mass of one mole of that element or isotope
B. as the sum of the protons, neutrons, and electrons it contains
C. as the number of protons its nucleus contains
D. as the sum of the protons and neutrons its nucleus contains - ANSWER: D
How many neutrons does the nucleus of carbon-14 have?
A. 12
B. 14
C. 6
D. 8 - ANSWER: D
Ions are _________.
A. atoms that have gained electrons
B. all of the above and/or below
C. atoms that have lost electrons
D. atoms or groups of atoms with a net electrical charge that is not equal to zero -
ANSWER: B
Na+ is an example of _________.
A. a cation
, B. an anion
C. a proton
D. a nonmetal - ANSWER: A
The internal structure of an atom can roughly be described as _______.
A. an even mixture of mass and charge scattered throughout a spherical shape
B. massive, positively charged particles in orbit around a low-mass, negatively
charged center
C. a massive, positively charged center and mostly empty space
D. positively charged, low-mass particles in orbit around a massive, negatively
charged center - ANSWER: C
The unit for all atomic weights is ______.
A. atomic mass units (amu)
B. g
C. g/atomic number
D. g/atom - ANSWER: A
What name is commonly given to the elements in Group IA of the periodic table?
A. platinum metals
B. transition metals
C. alkali metals
D. alkaline earth metals - ANSWER: C
Where can most of an atom's mass be found?
A. in the nucleus
B. as small particles orbiting a common nucleus in circular paths
C.distributed uniformly throughout an approximately spherical atom
D. in concentric layers outside the nucleus - ANSWER: A
Which of the following species has the most electrons?
A. Sr2+
B. Br-
C. As 3+
D. Rb - ANSWER: D
Which of the following elements is most chemically similar to phosphorus?
A. S
B. Sb
C. Se
D. As - ANSWER: D
Which of the following nuclide notations correctly represents lead-209?
A. superscript 127, Pb
B. superscript 209, Li
C. superscript 291, Pb
D. superscript 209, Pb - ANSWER: D
ACTUAL EXAM COMPLETE 500 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+
The atomic number is equal to __________.
A. the sum of protons and neutrons
B. the number of nucleons
C. the number of neutrons
D. the number of protons - ANSWER: D
A species has 18 electrons, 17 neutrons and 16 protons. The species is __________.
A. superscript 34, Cl, 2- charge
B. superscript 33, S, 2+ charge
C. superscript 33, S, 2- charge
D. superscript 35, S, 2- charge - ANSWER: C
Sodium chloride (NaCl) is 39.3% Na by mass. In a 418 g sample of NaCl, how many
grams of chlorine are present?
A. 254 g
B. 83.6 g
C. 140.8 g
D. 235 g - ANSWER: A
How is the term "mass number" defined for a given atom for isotope?
A. as the mass of one mole of that element or isotope
B. as the sum of the protons, neutrons, and electrons it contains
C. as the number of protons its nucleus contains
D. as the sum of the protons and neutrons its nucleus contains - ANSWER: D
How many neutrons does the nucleus of carbon-14 have?
A. 12
B. 14
C. 6
D. 8 - ANSWER: D
Ions are _________.
A. atoms that have gained electrons
B. all of the above and/or below
C. atoms that have lost electrons
D. atoms or groups of atoms with a net electrical charge that is not equal to zero -
ANSWER: B
Na+ is an example of _________.
A. a cation
, B. an anion
C. a proton
D. a nonmetal - ANSWER: A
The internal structure of an atom can roughly be described as _______.
A. an even mixture of mass and charge scattered throughout a spherical shape
B. massive, positively charged particles in orbit around a low-mass, negatively
charged center
C. a massive, positively charged center and mostly empty space
D. positively charged, low-mass particles in orbit around a massive, negatively
charged center - ANSWER: C
The unit for all atomic weights is ______.
A. atomic mass units (amu)
B. g
C. g/atomic number
D. g/atom - ANSWER: A
What name is commonly given to the elements in Group IA of the periodic table?
A. platinum metals
B. transition metals
C. alkali metals
D. alkaline earth metals - ANSWER: C
Where can most of an atom's mass be found?
A. in the nucleus
B. as small particles orbiting a common nucleus in circular paths
C.distributed uniformly throughout an approximately spherical atom
D. in concentric layers outside the nucleus - ANSWER: A
Which of the following species has the most electrons?
A. Sr2+
B. Br-
C. As 3+
D. Rb - ANSWER: D
Which of the following elements is most chemically similar to phosphorus?
A. S
B. Sb
C. Se
D. As - ANSWER: D
Which of the following nuclide notations correctly represents lead-209?
A. superscript 127, Pb
B. superscript 209, Li
C. superscript 291, Pb
D. superscript 209, Pb - ANSWER: D
