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Unit 1 : preparatory stage - year 1
Unit 1 : preparatory stage - year 1
نسخ
تكرار
اختبار خاص بالمعلم:
hend walid
إسمك
صفك
1
The colour property is a distinguishing factor between..........
oxygen and nitrogen.
iron and gold.
oxygen and carbon dioxide.
table salt and flour.
2
The motion of solid molecules is..........
limited.
the most.
completely free.
unlimited.
3
The chemical symbol of nitrogen atom is..........
Ne
No
Na
N
4
The smell property is a distinguishing factor between...........
iron and copper.
wood and plastic.
silver and iron.
vinegar and perfume.
5
The liquid matter is characterized by all of the following except..........
it takes the shape of the container.
the intermolecular distances among its molecules are intermediate.
the intermolecular force among its molecules is very small.
the motion of its molecules is more free.
6
The atom nucleus contains..........
protons and electrons.
neutrons and electrons.
protons, neutrons and electrons.
protons and neutrons.
7
The volume of liquid is calculated from the relation..........
density ÷ mass
mass ÷ density
mass + density
mass × density
8
The attraction force between water molecules is............. that between water vapor molecules.
no correct answer
more than
equal to
less than
9
The sum of the numbers of protons and neutrons in the nucleus of the atom is known as.........
atomic number.
mass number.
density.
valency.
10
The density of a substance whose mass is 15 gm and occupies 30 cm³ is........... the density of water.
no correct answer
less than
equal to
more than
11
It is a substance which is formed from the combination of atoms of two or more different elements with constant weight ratios.
The compound.
an atom.
a molecule.
no correct answer.
The element.
12
Negative charged particles of negligible mass are..........
neutrons.
electrons.
protons.
all of the previous answers.
13
The density of petroleum oil is.......... that of water.
equal to
more than
less than
no correct answer
14
........... is the monoatomic liquid molecule.
lodine
Chlorine
Bromine
Mercury
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