Physical Science B End of Semester Test EPIC Exam Questions And Answers 100% Pass.
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Physical Science B End of Semester Test
EPIC Exam Questions And Answers 100%
Pass.
Which is an example of a solution? - answersalt and water
Dry ice, or solid carbon dioxide, has the molecular formula CO2. How should you classify it? -
answercompound
Which statement is true of a chemical chan...
Physical Science B End of Semester Test
EPIC Exam Questions And Answers 100%
Pass.
Which is an example of a solution? - answer✔salt and water
Dry ice, or solid carbon dioxide, has the molecular formula CO2. How should you classify it? -
answer✔compound
Which statement is true of a chemical change? - answer✔It involves changes in the molecular
structure.
Which is a chemical property of hydrogen? - answer✔[X]It is a light gas
What can you say about a calcium atom by looking at the symbol 44/20 Ca? - answer✔A
calcium atom has 20 protons and 24 neutrons.
Which types of orbitals are found in the principal energy level n = 2? - answer✔s, p
Hydrogen (H-1), deuterium (H-2), and tritium (H-3) are the three isotopes of hydrogen. What are
the values of a, b, and c in the table? - answer✔D) a = 1, b = 1, c = 2
Using the information in the table, what is the average atomic mass of sulfur? - answer✔[X]
33.71 amu
Which of these elements has two valence electrons? - answer✔barium (Ba)
Which of these elements is a halogen? - answer✔bromine (Br)
What is the order in which electrons start filling the orbitals? - answer✔A)1s 2s 2p 3s 3p 4s 3d
4p
Which of the following states that an orbital can contain two electrons only if all other orbitals at
that sublevel contain at least one electron? - answer✔[X]Pauli exclusion principle
Which of these 2A elements has the largest atomic radius? - answer✔radium
Which of these groups of elements show the least electronegativity? - answer✔[X]halogens (7A)
Why does common table salt (NaCl) have a high melting point? - answer✔It forms an ionic bond
with a crystal lattice structure.
Which statement best describes the properties of covalent compounds? - answer✔They may be
gases, liquids, or solids at room temperature, and have a low melting and boiling point.
The ions Cr3+ and O2- combine to form the ionic compound chromium oxide. In what
proportions do these ions combine to produce a neutral compound? - answer✔2:3
Give the name and formula of the compound formed when a Mn2+ cation combines with a
(PO4)3- anion. - answer✔[X]manganese sulfate: Mn2(PO4)3
Which is the correct Lewis dot structure of NH2-? - answer✔D
Which is the correct Lewis structure for ethylene, C2H4? - answer✔A
What is the nature of the P-O bond in phosphorus pentoxide (P2O5)? - answer✔highly polar
covalent
Which pair of atoms has the highest electronegativity difference? - answer✔Na-F
What causes the difference in bond angles in carbon dioxide and water? - answer✔the fact that
the number of lone pairs of electrons on the central atom is greater in the case of water
What is the characteristic angle between atoms in a linear molecule, such as carbon dioxide? -
answer✔180°
The atomic mass of iron is 55.85, and oxygen is 16.0. What is the mass of 6.02 × 1023 molecules
of Fe2O3? - answer✔159.7 g
The atomic mass of potassium is 39.1. What is the mass of 6.02 × 1023 atoms of potassium? -
answer✔39.1 g
If the coefficient 2 is placed in front of the product tetraiodine nonaoxide (I4O9), then, how
many atoms of each element must be accounted for on the otherside of the equation? -
answer✔[X] 4 iodine atoms and 9 oxygen atoms
Which equation obeys the law of conservation of mass? - answer✔[X] B) C4H10+ Cl2 + 2O2 ->
7CO2 + CCl4 + 8H2O
Using this activity chart, which reaction will happen when a piece of copper is placed in a lead
nitrate solution? - answer✔No reaction occurs.
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