Unit 1 : preparatory stage - year 1

1
The colour property is a distinguishing factor between..........
2
The motion of solid molecules is..........
3
The chemical symbol of nitrogen atom is..........
4
The smell property is a distinguishing factor between...........
5
The liquid matter is characterized by all of the following except..........
6
The atom nucleus contains..........
7
The volume of liquid is calculated from the relation..........
8
The attraction force between water molecules is............. that between water vapor molecules.
9
The sum of the numbers of protons and neutrons in the nucleus of the atom is known as.........
10
The density of a substance whose mass is 15 gm and occupies 30 cm³ is........... the density of water.
11
On heating a liquid substance, an..........
12
The atomic number of an element having 6 protons in its nucleus is............
13
When a substance sinks in water, this means that its density is......... the density of water.
14
It is a substance which is formed from the combination of atoms of two or more different elements with constant weight ratios.
15
Negative charged particles of negligible mass are..........
16
The density of petroleum oil is.......... that of water.
17
........... is the monoatomic liquid molecule.
18
The energy of the electron is........... the energy of the level which it revolves in.
19
Heating coils are made up of.......... alloy.
20
Water molecule is composed of........
21
The rule 2n² cannot be applied to the energy level...........
22
All of the following substances conduct electricity except..........
23
The number of elements is equal to the number of atoms in......... molecule.
24
The electrons of potassium atom (K) has (19 proton) are distributed in......... energy level(s).
25
All of the following solutions conduct electricity except.......... solution.
26
One gram of....... contains one type of atoms.
27
The properties of.......... of water is the same properties of 100 ml of it.
28
The taste property is a distinguishing factor between..........
29
The intermolecular spaces among the molecules of........... are very small.
30
Silver is symbolized by............
31
Density of matter =.............
32
The attraction force among solid molecules is..............
33
The atomic number of the atom of an element equals the...........
34
The mass of water in gm is always....... its volume in cm³ (knowing that the density of water is 1 gm/cm³).
35
On heating a solid substance............
36
The mass number of an atom having 13 electrons and 14 neutrons equals...........
37
........... is from the substances that float on water surface.
38
It is the simplest pure form of matter which can't be analyzed chemically into simpler form by simple chemical methods.
39
The balloons that are filled with helium gas in celebrations, rise up in air. because..........
40
The intermolecular force among the molecules of water is...........
41
The energy of the excited atom is.......... the energy of the atom in its ground state.
42
.......... Used for fast cooking
43
The molecule of oxygen is composed of.......... atom(s).
44
The third energy level is saturated with........... electrons.
45
Metals are characterized by their.........
46
Which one of the following molecules contains the largest number of atoms?...........
47
The atomic number of an element has 2 electrons in "L" level is
48
Among elements which has a great difficulty to react with oxygen of air is............
49
The symbol of copper atom is...........
50
The property of electric conduction is a distinguishing factor between..........

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