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Physical Science:

Dr. Sunil Karna

Section 8.5 Examples

Example 8.5.1.

Which of the following cannot be decomposed by chemical and physical means.
  1. a compound
  2. an element
  3. a solid
  4. a solution
Answer.
b.

Example 8.5.2.

How many element groups are there in a periodic table?
  1. 7
  2. 11
  3. 18
  4. 26
Answer.
c.

Example 8.5.3.

How many element periods are there in a periodic table?
  1. 5
  2. 7
  3. 9
  4. 0
Answer.
b.

Example 8.5.4.

Who developed the periodic table?
  1. Henry Moseley
  2. Dimitri Mendeleev
  3. John Newlands
  4. De Chancourtois
Answer.
b.

Example 8.5.5.

Who discovered the number of protons in the nucleus of each atom.
  1. Ernest Rutherford
  2. J. J. Thomson
  3. Daltons
  4. Neil Bohr
Answer.
a.

Example 8.5.6.

What is the atomic number for helium?
  1. 1
  2. 2
  3. 4
  4. 8
Answer.
b.

Example 8.5.7.

What is the symbol for Argon?
  1. A
  2. Ar
  3. Ag
  4. An
Answer.
b.

Example 8.5.8.

The symbol \(Au\) stands for what element?
  1. Gold
  2. Silver
  3. Tin
  4. Argon
Answer.
a.

Example 8.5.9.

Which of the following substances is a homogenours mixture?
  1. air
  2. salt
  3. seawater
  4. soil
Select one of the following:
  1. a. and b.
  2. a. and c.
  3. a. and d.
  4. none of above.
Answer.
ii.

Example 8.5.10.

Most elements in the periodic table are at room temperature and atmospheric pressure.
  1. metallic solids
  2. gases
  3. liquids
  4. nonmetallic solids
Answer.
a.

Example 8.5.11.

Which of the following set of elements possess similar chemical properties?
  1. \({}_9F\) and \({}_{17}Cl\)
  2. \({}_3Li\) and \({}_4Be\)
  3. \({}_1H\) and \({}_2He\)
  4. \({}_{11}Na\) and \({}_{12}Mg\)
Answer.
a.

Example 8.5.12.

Which of the following statements is true regarding the periodic table?
  1. The horizontal rows in the periodic table are known as groups
  2. The verticle columns in the periodic table are known as periods
  3. In the periodic table, when the atomic number increases, the properties of the elements repeat regularly
  4. The periodic table is classified into blocks based on the electron filling pattern into shells
Answer.
c.

Example 8.5.13.

Which of the following properties are unique to metals?
  1. No metallic lustre (or, dull appearance)
  2. Solids under room temperature
  3. Low melting points
  4. Poor conductors of electricity and heat
Answer.
b.

Example 8.5.14.

How many valence electrons does \({}_{11}Na\) have?
  1. 1
  2. 11
  3. 3
  4. 9
Answer.
a.

Example 8.5.15.

How many valence electrons does Group 13 have?
  1. 13
  2. 3
  3. 5
  4. 10
Answer.
b.

Example 8.5.16.

The position of an element in the Periodic Table is determined by which of the followings?
  1. its atomic radius.
  2. its atomic mass.
  3. its atomic number.
  4. its density.
Answer.
c.

Example 8.5.17.

Which statement is true of covalent bonds?
  1. No matter the element, there is the same bond length between neighboring atoms.
  2. Valence electrons must be shared equally between atoms in order to achieve stability.
  3. Covalent bonds form when the nuclei of two atoms attract each other.
  4. Atoms find the ideal separation distance where electrostatics forces are reduced to a minimum.
Answer.
b.

Example 8.5.18.

Which of the following has a full valence shell?
  1. oxygen.
  2. carbon.
  3. neon.
  4. iron.
Answer.
c.

Example 8.5.19.

An ionic bond forms when atoms electrons.
  1. gain
  2. share
  3. increase
  4. transfer
Answer.
d.

Example 8.5.20.

What is an ion?
  1. An atom or group of atoms that have gained or lost electrons.
  2. An atom or group of atoms that have gained or lost protons.
  3. An atom that has more neutrons than protons.
  4. An atom that shares electrons with another atom.
Answer.
a.

Example 8.5.21.

How does a chloride ion of charge \(-1\) become neutral?
  1. By losing two electrons.
  2. By losing one electron.
  3. By gaining two electrons.
  4. By gaining one electron.
Answer.
b.

Example 8.5.22.

A group of atoms carrying an unpaired electron is known as
  1. an ion.
  2. a radical.
  3. a crystal lattice.
  4. a covalent bond.
Answer.
b.

Example 8.5.23.

Which of the following elements does not have a valency of 3?
  1. sulfur.
  2. boron.
  3. nitrogen.
  4. aluminum.
Answer.
a.

Example 8.5.24.

The number of electrons gained, lost, or shared by an atom in a chemical bond is also known as
  1. its atomic number.
  2. its valency.
  3. its mass number.
  4. its charge.
Answer.
b.

Example 8.5.25.

What is the name of the compound formed when sulfur combines with magnesium?
  1. Magnesium sulfur.
  2. Magnesium sulfate.
  3. Sulfur magnesium.
  4. Magnesium sulfide.
Answer.
d.

Example 8.5.26.

The number of atoms in a molecule of \(Ca_3(PO_4)_2\) is
  1. 8.
  2. 13.
  3. 16.
  4. 12.
Answer.
b.

Example 8.5.27.

The number of oxygen atoms in a molecule of \(Ca_3(PO_4)_2\) is
  1. 4.
  2. 8.
  3. 13.
  4. 1.
Answer.
b.

Example 8.5.28.

Which one of the follwing equations is balanced?
  1. \(\displaystyle 6CO_2 + 6H_2O → C_6H_{12}O_6 + 6O_2 \)
  2. \(\displaystyle 6CO_2 + 6H_2O → C_6H_{12}O_6 + O_2 \)
  3. \(\displaystyle CO_2 + 6H_2O → C_6H_{12}O_6 + 6O_2 \)
  4. \(\displaystyle 6CO_2 + H_2O → C_6H_{12}O_6 + 6O_2 \)
Answer.
a.

Example 8.5.29.

Write the missing number in the equation below
\begin{equation*} 2HNO_3 + Ca(OH)_2 → Ca(NO_3)_2 +[...]H_2O \end{equation*}
  1. \(\displaystyle 1\)
  2. \(\displaystyle 2\)
  3. \(\displaystyle 3 \)
  4. \(\displaystyle 4 \)
Answer.
b.
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