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WorksheetsYear 7 Unit 1 General Revision Questions
Total questions: 99
Worksheet time: 52mins
Each of the following is matter, except ......
air.
light.
sand.
table salt.
Which of the following is a characteristic of the nucleus of an atom?
Positively charged.
Negatively charged.
Contains negatively charged electrons.
Contains negatively charged protons.
The mass of a proton equals ......
1 g
1 kg
1 u
1 mg
The mass of the atom is approximately equal to the sum of masses of ......
the electrons and the protons.
the protons and the nucleons.
the neutrons and the electrons.
the protons and the neutrons.
On comparing the charge of protons to the charge of electrons in an atom of any element, the charge of the protons is ......
Greater than the charge of the electrons and of the same type.
Greater than the charge of the electrons and of an opposite type.
Equal to the charge of the electrons in magnitude and of the same type.
Equal to the charge of the electrons in magnitude and of an opposite type.
Which of the following groups of elements has chemical symbols starting with the letter A?
Aluminum, Silver and Lithium.
Gold, Mercury and Silver.
Gold, Aluminum and Sodium.
Aluminum, Silver and Gold.
Which of the following represents an element and its correct symbol?
Potassium P
Phosphorus F
Nitrogen Ni
Chromium Cr
What are the elements which compose glucose C6H12O6?
Carbon, Helium and Water.
Carbon, Hydrogen and Oxygen.
Calcium, Hydrogen and Oxygen.
Copper, Hydrogen and Oxygen.
Which two compounds do contain the three essential elements required for plant growth?
(NH4)2SO4, Ca(NO3)2
(NH4)3PO4, Ca(NO3)2
(NH4)2SO4, KNO3
(NH4)3PO4, KNO3
A fertilizer package contains the two compounds (NH4)2SO4 and K2SO4. What are the elements essential for plant growth in this package?
Nitrogen and Hydrogen.
Sulphur and Oxygen.
Potassium and Nitrogen.
Potassium and Sulphur.
The number of electrons that can saturate each energy level in an atom equals ......
three times the energy level number.
twice the square of the energy level number.
twice the energy level number.
twice the cube of the energy level number.
In the relation (2n²), the symbol (n) refers to ......
energy level number.
number of electrons.
number of protons.
element's symbol.
In the atom of 24/12 Mg has ......
an atomic number equal to its mass number.
a mass number equal to its number of neutrons.
a number of protons equal to its number of neutrons.
a number of energy levels equal to its number of electrons.
The number of negatively charged particles in aluminum atom 27/13 Al is ....
A. 13
B. 14
C. 20
D. 27
The energy level L in silicon atom 14/6 Si contains ......
2e⁻
3e⁻
8e⁻
18e⁻
The last energy level contains 7 electrons in the atom of......
N
F
Na
What is the symbol of element (X) whose atom contains 18 protons, 18 electrons and 22 neutrons?
18^18X
36^18X
40^18X
40^22X
From the isotopes of carbon: Carbon–12 and Carbon–14. Which of the following is correct?
The two isotopes have the same number of neutrons.
The two isotopes differ in the number of nucleons.
The two isotopes have the same mass number.
The two isotopes have different numbers of protons.
In Moseley's table, each element exceeds the preceding element in the same period by one ......
neutron.
proton.
energy level.
atomic mass.
The alkali earth metals are located in the ...... of the periodic table.
left
right
middle
bottom
The number of elements in period 3 of the periodic table is equal to ......
2
7
8
10
The ...... - block contains most types of elements.
s
p
d
f
The zero group in the modern periodic table belongs to ...... - block.
s
p
d
f
The zero group includes ......
metals.
liquid nonmetals.
metalloids.
inert gases.
...... is one of nonmetals elements.
A. Magnesium
B. Oxygen
C. Nitrogen
D. Carbon
...... is a solid halogen.
Fluorine
Chlorine
Bromine
Iodine
All periods of the modern periodic table end with ......
transitional elements.
inert elements.
alkaline elements.
alkaline earth elements.
The outermost energy level of argon gas Ar contains ...... electron(s).
1
8
18
32
Transition elements start appearing in the modern periodic table from period ......
2
3
4
5
Lanthanides belong to ......-block.
s
p
d
f
31. Period 4 includes elements from ...... blocks.
s · p
s · d · p
s · f · p
s · p · d · f
The elements of d-block are known as ......
inert elements.
transitional metals.
alkali.
alkaline earth.
The element whose energy level M contains 2 electrons is located in the ...... of the modern periodic table.
period 2 , group 3A
period 3 , group 2A
period 2 , group 4A
period 4 , group 2A
The atomic number of the inert gas which is located in period 2 is ......
2
8
10
18
An alkali metal is located in period 2, its atomic number is ......
9
7
5
3
If the outermost energy level of a halogen atom is the level L, its atomic number is ......
A. 7
B. 9
C. 17
D. 19
An element is located in period 3, group 3A and its nucleus contains 14 neutrons, so its mass number is ....
30
27
24
20
Lewis structure contains 2 unpaired electrons in the atom of ......
6C
7N
15P
16S
Element (A) is located in the second period and contains three unpaired electrons in its outermost energy level according to Lewis dot structure, its atomic number is likely to be ......
2
3
4
7
The valency of iodine is ......
trivalent.
divalent.
monovalent.
zero.
The valency of argon is ......
0
1
6
8
The element which has the largest atomic radius in the same vertical group is the one with ....
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
...... 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
All of the following describe an element, except ......
A. it cannot be decomposed into simpler forms.
B. it consists of different atoms.
C. it is the simplest form of substance.
D. it may have more than one isotope.
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.
All of the following gases molecules are monatomic, except ......
helium molecule.
argon molecule.
oxygen molecule.
neon molecule.
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
All of the following organic compounds molecules consist of thousands of atoms, except ......
vitamin D.
methane.
plastic polymers.
hemoglobin.
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.
All of the following are characteristics of aerogel, except that ....
it is one of the lightest gases.
it has low density.
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.
All the following atoms can form ions, except ......
1_7Cl
1_3Al
1_8Ar
1_2Mg
Inert gases molecules are composed of ......
one atom.
two different atoms.
two similar atoms.
three atoms.
The electron configuration of the 2_0Ca ion is similar to the electron configuration of the ......
9F
1_0Ne
1_8Ar
1_6S
The closest noble gas to the sodium cation 1_1Na is ......
1_8Ar
1_2Mg
1_0Ne
9F
The number of electrons in the following ions equals that in the magnesium ion 1 2Mg, except the ion of ....
1 3Al
1 7Cl
1 1Na
8O
The number of energy levels in sodium ion is ...... the number of energy levels in its atom.
less than
greater than
equal to
The ion of sulfur atom 1 6 32S contains 16 protons and ......
32 electrons.
16 electrons.
14 electrons.
18 electrons.
Ionic bonding arises between calcium element 2 0Ca and ...... element.
4Be
8O
1 2Mg
1 9K
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
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.
The simplest chemical formula of the organic compound which is formed by the combination of carbon and hydrogen is ....
CH
CH₄
C₂H
C₂H₂
Dalton considered the atom to be indivisible.
True
False
The charge of a proton is equal to the charge of an electron in quantity and type.
True
False
Protons are the smallest subatomic components in terms of mass.
True
False
NPK fertilizer contains nitrogen, potassium and calcium elements.
True
False
The atomic number is written above the left side of the symbol of the element.
True
False
The atom containing 13 protons, 14 neutrons and 13 electrons is electrically neutral.
True
False
Electrons revolve inside the nucleus in energy levels.
True
False
The way of electron revolution is the same in all sublevels.
True
False
The energy of the level increases as it gets closer to the nucleus.
True
False
The third energy level in an atom is located between M and K levels and can be saturated with 8 electrons.
True
False
The higher energy levels are filled with electrons first.
True
False
The number of neutrons is twice the number of protons in the nucleus of tritium isotope.
True
False
Magnesium-24 is identical to magnesium-25 in the number of protons.
True
False
The number of elements known so far is 118.
True
False
The modern periodic table consists of 9 horizontal periods and 13 vertical groups.
True
False
Argon and helium are both active gases.
True
False
The p-block in the modern periodic table consists of 5 vertical groups.
True
False
The d-block contains most types of elements.
True
False
Elements in the same period have similar chemical properties.
True
False
An element is located in period 1 and group 0 has an atomic number of 1.
True
False
