WorksheetsLewis Dot Structure Multiple Choice Question
Total questions: 86
Worksheet time: 43mins
The opposite figure represents Lewis dot structure of a compound molecule formed of the elements (X) and (Y). What are the symbols of the two elements (X) and (Y) which compose this molecule?
(X): 9F, (Y): 8O
(X): 7N, (Y): 9F
(X): 7N, (Y): 1H
(X): 16S, (Y): 1H
The two ions 54_26X2+ and 59_27Y3+ have similar number of ........
electrons only.
neutrons only.
protons only.
electrons and neutrons.
The number of electric charges carried by the ion of an element, whose atomic number is 7, equals the number of electric charges carried by the ion of an element, whose atomic number is ........
9
13
16
20
The number of electrons in the outermost energy level of oxygen ion equals the number of electrons in the outermost energy level of ........
Na+ ion.
H+ ion.
He atom.
Br atom.
What is the symbol of the ion whose nucleus contains 12 protons and is surrounded by 10 electrons?
Ne2+
Mg2-
Mg2+
Ne2-
The element with atomic number ........ bonds with the element with atomic number 16 by an ionic bond.
2
8
10
12
The nonmetal element atom whose nucleus contains 18 neutrons, its electrons revolve in three energy levels, and it tends to gain one electron during chemical reactions, its mass number is ........
17
18
35
40
What is the chemical formula of the compound formed by the combination of the element 20X with the element 17Y?
XY2
XY3
X2Y
X3Y
The opposite figure is a section from the periodic table. What is the element whose ion carries a charge equals -2?
A
B
C
D
The opposite figure represents a compound that is ...
ionic and dissolves in water.
covalent and has a high melting point.
ionic and reacts with caustic soda.
covalent and reacts with caustic soda.
Which of these elements can have its atoms bonded together in long chains?
Sodium.
Oxygen.
Sulfur.
Carbon.
The following figures show 4 carbon skeletons, each of them containing 5 carbon atoms: How many of these carbon skeletons represent(s) straight chains?
1
2
3
4
The simplest chemical formula of the organic compound which is formed by the combination of carbon and hydrogen is ...
CH2
CH4
C2H
C4H
The opposite figure represents ..........
sodium ion.
fluoride ion.
sodium atom.
fluorine atom.
Which of the following represents ionic bonding?
[Na]+ [Cl]-
H: S: H
[Li]+ [F]-
H: Cl:
Which of the following pairs of elements are bonded together through ionic bonding?
X, Y
X, Y
X, Y
X, Y
Ionic bonding arises between calcium element 20Ca and .......... element.
4Be
8O
12Mg
19K
Which of the following elements cannot be bonded with chlorine under normal conditions?
Hydrogen.
Helium.
Magnesium.
Sodium.
Among the properties of sodium chloride salt is that ..........
it does not dissolve in water.
it has a low melting point.
it has a low boiling point.
its molten conducts electricity.
The bond in hydrogen molecule is ..........
ionic.
single covalent.
double covalent.
triple covalent.
The bonds in water molecule are ..........
single covalent.
double covalent.
triple covalent.
ionic.
A single covalent bond is formed in .......... molecule.
oxygen
chlorine
nitrogen
helium
Which of the following represents the bonding in oxygen molecule by Lewis method?
:O::O:
::O::O::
O=O
:O::O:
In oxygen molecule, each atom shares .......... electrons.
1
2
3
4
How many covalent bonding electrons are there in nitrogen molecule?
2 electrons.
3 electrons.
6 electrons.
14 electrons.
All the following describe the chlorine element 17Cl, except that ..........
it is a diatomic molecule.
its atom forms a negatively charged ion.
it is less chemically reactive than bromine element.
it forms an ionic bond with potassium.
From the beginning of the lesson to the end of ionic bonding
17Cl
13Al
18Ar
12Mg
From the beginning of the lesson to the end of ionic bonding (2) Inert gases molecules are composed of ..........
one atom.
two different atoms.
two similar atoms.
three atoms.
The electron configuration of the 20Ca ion is similar to the electron configuration of the .......... ion.
9F
10Ne
18Ar
16S
From the beginning of the lesson to the end of ionic bonding (4) The closest noble gas to the sodium cation 11Na is ..........
18Ar
12Mg
10Ne
9F
From the beginning of the lesson to the end of ionic bonding The number of electrons in the following ions equals that in the magnesium ion 12Mg, except the ion of ..........
13Al
17Cl
11Na
8O
From the beginning of the lesson to the end of ionic bonding The number of energy levels in sodium ion is .......... the number of energy levels in its atom.
less than
greater than
equal to
From the beginning of the lesson to the end of ionic bonding (7) The ion of sulfur atom 32S contains 16 protons and ..........
32 electrons.
16 electrons.
14 electrons.
18 electrons.
From the beginning of the lesson to the end of ionic bonding (8) The number of .......... in the chloride ion is greater than their number in the chlorine atom 35Cl
protons
neutrons
energy levels
electrons
Which of the following ions gained the least number of electrons?
17Cl-
20Ca2+
13Al3+
15P3-
Which of the following represents an ionic bonding?
[K]+ [F]-
H··O··H
[Li]+ [Br]-
O··C··O
What is the molecular formula of the compound formed through the bonding of an alkali metal (A) with an element (B) from group 6A?
A2B2
A2B
AB2
AB
An atom of element (X) bonds with two hydrogen atoms, as shown in the opposite figure: H··X··H What is the type of bonding in this molecule? And what is the group number of element (X) in the periodic table?
Ionic / Group 6A
Ionic / Group 2A
Covalent / Group 6A
Covalent / Group 2A
Covalent bonding occurs between ..........
metal and metal.
metal and nonmetal.
nonmetal and nonmetal.
nonmetal and inert gas.
What is the number of covalent bonds in a water molecule?
One single bond and another double bond.
2 double bonds.
2 single bonds.
One single bond and another triple bond.
In a nitrogen molecule, each atom shares .......... electron(s).
1
2
3
4
The opposite figure represents Lewis dot structure of the bond between atoms (X) and (Y). What are the symbols of atoms (X) and (Y)?
(X): N, (Y): H
(X): O, (Y): O
(X): N, (Y): N
(X): H, (Y): O
Which of the following is considered a stable element whose atoms do not bond with others under normal conditions?
H
He
Si
Ca
Which of the following ions has the same electron configuration as argon atom?
19K+
11Na+
13Al3+
7N3-
Which of the following shows the bonding in the sodium bromide compound NaBr?
Na - Br
[Na]+ [Br]-
:Na:Br:
[Na]- [Br]+
All of the following show the properties of the potassium iodide compound KI, except that ............
it dissolves in water.
its melting point is high.
it has a neutral electric charge.
the two ions of the compound have the same electron configuration.
In the opposite figure: Two cubes (1) and (2) made of two different substances were placed in two different liquids (X) and (Y). What can you conclude from this figure?
The density of liquid (X) is greater than the density of cube (1).
The density of liquid (Y) is greater than the density of cube (2).
The density of liquid (Y) is less than the density of cube (1).
The density of liquid (X) is equal to the density of cube (1).
The opposite table shows the observations made when a solid object is placed in four different liquids (each one separately). What is the density of the material of this object?
Greater than 1.1 g/cm³ and less than 1.4 g/cm³
Greater than 1 g/cm³ and less than 1.1 g/cm³
Equal to 1.1 g/cm³
Equal to 1 g/cm³
Vitamin D regulates the level of .......... in the blood.
Mg
Ca
Cl
Na
The molecular formula of caffeine substance found in coffee is C8H10N4O2. All of the following are correct, except ..........
the caffeine molecule contains two elements: carbon and nitrogen.
the caffeine is an inorganic compound.
the caffeine molecule contains 4 nitrogen atoms.
the caffeine molecule consists of 4 elements.
What is the number of nonmetals atoms in one molecule of Egyptian blue dye (CaCuSi4O10)?
2
10
15
14
All of the following are characteristics of aerogel, except that ..........
it is one of the lightest gases.
it has low density.
it is extremely durable.
it has very high insulating properties.
From the chemical properties of sodium carbonate ..........
it dissolves in water.
it is a good conductor of electricity.
it forms gas bubbles with lemon.
its melting point is high.
Balloons can be filled with ..........
oxygen.
nitrogen.
chlorine.
helium.
What are the physical properties that should be found in a new substance used in manufacturing aircraft structures?
Heavy and hard.
Flexible and low density.
Strong and low density.
Shiny and good conductor of electricity.
Which of the following is considered a compound?
Egyptian blue dye.
Aluminum - Titanium alloy.
Stainless steel alloy.
Silicon.
Classification of substances (1) .......... is from heterogeneous mixtures.
Natural milk
Oil in water
Drinking water
Disinfectants
The solution of sugar and water is a .......... mixture, whose components ..........
heterogeneous, can be distinguished.
homogeneous, can be distinguished.
homogeneous, cannot be distinguished.
heterogeneous, cannot be distinguished.
When table salt and sand are stirred together in water, a .......... is formed.
heterogeneous mixture
solution
homogeneous mixture
compound
Classification of substances (4) All of the following describe an element, except ..........
it cannot be decomposed into simpler forms.
it consists of different atoms.
it is the simplest form of substance.
it may have more than one isotope.
Classification of substances (5) All of the following can be separated into their components by chemical methods, except ..........
water.
methane.
mercury oxide.
magnesium.
The element whose molecule consists of two atoms is ..........
mercury oxide.
bromine.
sodium chloride.
sodium.
Classification of substances (7) All of the following gases molecules are monatomic, except ..........
helium molecule.
argon molecule.
oxygen molecule.
neon molecule.
Classification of substances (8) All of the following molecules consist of two elements, except .......... molecule.
water
hydrogen chloride
oxygen
methane
Which of the following is considered from molecules of polyatomic elements?
H2
Na
HCl
O3
What is the number of elements involved in the composition of magnesium carbonate MgCO3?
2
3
4
5
Classification of substances (11) All of the following organic compounds molecules consist of thousands of atoms, except ..........
vitamin D.
methane.
plastic polymers.
hemoglobin.
Which of the following describes the properties of copper metal?
Melting point: -40°C, Sinking in water: ✗, Conducting electricity: ✓
Melting point: 8°C, Sinking in water: ✗, Conducting electricity: ✓
Melting point: 100°C, Sinking in water: ✓, Conducting electricity: ✗
Melting point: 1083°C, Sinking in water: ✓, Conducting electricity: ✓
All of the following are physical properties of a piece of calcium carbonate, except that it ...
is solid
doesn't dissolve in water
is white in color
produces gas bubbles with vinegar
The following table shows samples of different substances: Sample | Shiny | Flexible | Conducts electricity (1) | ✗ | ✗ | ✓ (2) | ✓ | ✗ | ✗ (3) | ✗ | ✓ | ✗ (4) | ✓ | ✓ | ✓ Which sample, its substance can be used in making water hose?
Sample (1)
Sample (2)
Sample (3)
Sample (4)
All of the following are inorganic compounds, except ...
blood hemoglobin.
carbon dioxide gas.
nitric acid.
water.
A mixture of sand and iron filings can be separated by ...
filtration.
magnetic separation.
heating.
electrolysis.
The number of atoms in a sulphuric acid molecule H2SO4 is equal to ...
8
7
6
5
All of the following substances have correct formulas, except ...
Egyptian blue dye: CaCuSi4O10
nitric acid: HNO3
methane: CH3
ozone: O3
The graph ........ represents the relation between the chemical activity of alkali metals and the period number of each of them.
[Graph a]
[Graph b]
[Graph c]
[Graph d]
An element has an atomic number of 18, the element that precedes it by two groups has an atomic number of ...
2
4
16
20
The opposite figure represents a section in the periodic table: 1- Element C belongs to the group of ... 2- Element D is ... 3- The atomic number of element A is ... (The letters represent hypothetical symbols of six different elements)
a gas.
metalloids.
alkali metals.
halogens.
inert gases.
Potassium is located in period 4, group 1A. How many neutrons are found in the nucleus of potassium-42 isotope?
19
20
23
42
Which of the following Lewis structures represents a chemically inactive element?
:W:
X:
Y:
Z:
Which of the following is correct?
(Graph a)
(Graph b)
(Graph c)
(Graph d)
From the opposite table: At temperature 26°C, ...
substance (A) is solid.
substance (C) is solid.
substances (A) and (B) are liquid.
substances (A) and (C) are gases.
The three substances are in the same physical state at ...
32°C
60°C
75°C
80°C
The element which has the largest atomic radius in the same vertical group is the one with ............
the least number of neutrons in its nucleus.
the least number of protons in its nucleus.
the least number of nucleons in its nucleus.
the largest number of electrons revolving around its nucleus.
What is the change which happens in the alkali metals by increasing the atomic number?
Their physical state changes.
Their melting points decrease.
Their atomic radii decrease.
Their boiling points increase.
The vertical group in the modern periodic table that includes the most active metals is ............
the halogens group.
the alkali metals group.
the 7A group.
the zero group.
The atomic number of the most active halogen is ............
19
35
17
9
