Science Department
High school section
Chemistry Revision Sheet
1st Quarter
Academic Year 2023 /2024
Name
Gr 10 (
)
**THIS NOT THE ONLY RESOURCES FOR CHEMISTRY**
EXAM
1
Q1: Choose the correct answer:
1- ………………… said that everything in the universe is made up of tiny particles
called atoms?
a. Democritis
b. Dalton
c. Copernicus
d. Aristotle
2a.
b.
c.
d.
The first model of an atom was given by ……………………….
N. Bohr
E. Goldstein
Rutherford
J.J. Thomson
3- This model of the atom described atoms as tiny
spheres that could not be broken down into
smaller pieces.
a- Dalton's model of the atom
b- The "Plum Pudding Model" of the atom
c- The Nuclear Model
d- The Bohr Model
4- Dalton reintroduced the concept of the atom and created ……………. which was
the basic concept of the molecule.
a. Dalton's Molecular Theory
b. Dalton's Atomic Theory
c. Modern Atomic Theory
d. New Atomic Theory
5a.
b.
c.
d.
JJ Thompson's discoverd what?
Electron
Nucleus
Proton
Neutrons
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6a.
b.
c.
d.
The charge on an electron is……………...
Positive
Negative
Neutral
The same as for an ion
7a.
b.
c.
d.
Aristotle said that everything is divided into four …………………….
Molecules
Elements
Protons
Hygrometer
8a.
b.
c.
d.
Milliken said that electron has ………………………………….
No charge and a large mass
A charge and a large mass
A charge and a small mass
A positive charge always
9- In a neutral atom, the numbers of protons and electrons are ………………….
a. Not the same
b. The same
10- The charge on an atom is ……………..
a. Neutral
b. Negative
c. Positive
11- A neutral atom has 40 electrons and 46 neutrons. How many protons does it
have?
a. 40
b. 46
c. 86
12- The central core of an atom is called the ……………...
a. Nucleus
b. Electron
c. Proton
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13- What are the atomic components whose charge neutralises the nuclear charge?
a. Electrons
b. Protons
c. Neutrons
d. Protons and neutrons
14- Which of the following statements best describes the nucleus of an atom?
a. It is a dense center that carries a negative charge.
b. It is a light center that carries a positive charge.
c. It is a dense center that carries a positive charge.
d. It is a light center that carries a negative charge.
15- The mass of a(n) …………… is about equal to the mass of a proton.
a. Atomic number
b. Neutron
c. Electron
d. Nucleus
16- The atom is electrically neutral because it contains ………………..
a. Neutrons
b. an equal number of protons and electrons
c. an equal number of neutrons and protons
d. a higher number of neutrons than protons
17- Which of the following is true about the atom?
a. At the centre of the atom, there is a nucleus that contains positive protons,
neutral neutrons, and negative electrons.
b. At the centre of the atom, there is a nucleus that contains positive protons and
neutral neutrons.
c. At the centre of the atom, there is a nucleus that contains neutral protons and
positive neutrons.
d. At the centre of the atom, there is a nucleus around which protons, neutrons,
and electrons revolve.
18- An atom with 47 protons, 61 neutrons, and 46 electrons will have a total charge
of …………………..
a. +1
b. 0
c. +14
d. −1
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19- A neutral atom has 22 electrons and 24 neutrons. What is its atomic number?
a. 22
b. 24
c. 45
20- The atom's mass is found mostly in the atom's ………………….
a. Nucleus
b. Protons
c. Electrons
d. Electron cloud
21- A particle that moves around the nucleus is …………………..
a. An electron
b. A proton
c. A quark
d. A neutron
22- The charge on a proton is ………………..
a. Negative
b. Positive
c. Neutral
d. The same as for an ion
23- A particle has 25 protons, 22 electrons and 24 neutrons.
Which of these statements is true?
a. The particle is an ion.
b. The particle is a neutral atom.
24- The charge on a neutron is …………………...
a. Positive
b. Negative
c. Neutral
d. The same as for an ion
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25- What is the atomic number?
abcd-
the number of protons and neutrons
the number of protons and electrons
the number of neutrons
the number of protons
26- What is the mass number?
abcd-
the number of protons and neutrons
the number of protons and electrons
the number of neutrons
the number of protons
27- What is the atomic number of this nucleus?
abcd-
3
1
4
7
28- What is the mass number of this nucleus?
abcd-
7
1
4
3
29- What is the atomic number of this atom?
abcd-
7
1
3
4
6
30- What is the mass number of this atom?
abcd-
1
4
3
7
31- The atomic number of an element tells us the number of protons and neutrons
in a specific isotope.
a. False
b. True
32- An element has the mass number 12 and atomic number 6. The number of
neutrons in it is…………………………
a- 8
b- 6
c- 10
d- 4
33- If an atom has 10 electrons, how many protons does it have?
a- 0
b- 5
c- 10
d- 1
34- How many electrons are in an atom with an atomic number of 50?
a- 2
b- 5
c- 8
d- 50
35- What subatomic particles would you find in the nucleus of an atom?
a- Protons and Electrons
b- Protons only
c- Protons and Neutrons
d- Neutrons and Electrons
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36- Which subatomic particles contribute the most to the mass of an atom?
a- Protons and Neutrons
b- Protons and Electrons
c- Protons only
d- Protons, Neutrons, Electrons
37- A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?
a- 15
b- 16
c- 1
d- 31
38- A fluorine atom has 9 protons and 10 neutrons. What is the atomic number of
fluorine?
a- 10
b- 9
c- 1
d- 19
39- How many neutrons in C-14?
a- 14
b- 8
c- 7
d- 6
40- How many protons does this isotope of titanium have?
a- 26
b- 48
c- 70
d- 22
41- How many neutrons does the isotope of lithium have?
a- 8
b- 4
c- 5
d- 3
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42- How many neutrons does uranium-235 have?
a- 146
b- 92
c- 238
d- 143
43- 612C 613C 614C what do these isotopes of carbon all have in common?
a- neutrons & mass number
b- Batomic number and electrons
c- Cprotons, atomic number, and mass number
d- Datomic number and neutrons
44- What quantities vary between isotopes of an element?
a- neutrons and mass number
b- protons, electrons, and atomic number
c- neutrons and electrons
d- protons, electrons, and mass number
45- During beta decay, a nucleus .................................
a- gives up two protons and two neutrons.
b- gains a proton and loses a neutron.
c- loses a proton and gains a neutron.
d- maintains the same number of protons and neutrons.
46- The type of radioactive particle that can be stopped by a sheet of paper is
the…………………...
a- Uranium
b- alpha particle
c- beta particle
d- gamma ray
47- The most penetrating type of radiation is the ……………………..
a- alpha particle
b- gamma ray
c- beta particle
d- uranium
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48- A helium nucleus with two protons and two neutrons is called a(n) ………….
a- alpha particle
b- gamma ray
c- electroscope
d- beta particle
49- Negatively charged particles emitted from a nucleus at a high speed are ……….
a- X rays
b- gamma rays
c- beta particles
d- alpha particle
50- Radon-222 has 86 protons and 136 neutrons. What product will form from
alpha decay?
a- Francium-222 (87 protons)
b- Polonium-218 (84 protons)
c- Radium-226 (88 protons)
d- Lead-220 (82 protons)
51- An alpha particle is a ………………………. nucleus.
a- U (uranium)
b- He (helium)
c- Na (sodium)
d- H (hydrogen)
52- With respect to penetrating power, a beta particle typically is stopped by ………..
a- Concrete
b- Foil
c- Lead
d- Paper
53- What type of particle is released during beta decay?
a- Nucleus
b- Electron
c- Neutron
d- Proton
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Q2: Complete the missing parts:
54-
55-
56-
13
14
57- Here are three isotopes of an element: 612C
6 C
6 C
a. The element is: __________________
b. The number 6 refers to the _________________________
c. The numbers 12, 13, and 14 refer to the ________________________z
d. How many protons and neutrons are in the first isotope? _________________
e. How many protons and neutrons are in the second isotope? ________________
f. How many protons and neutrons are in the third isotope? _________________
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Q3: Answer the following questions:
58- Summarize how matter was described by many early Greek philosophers.
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59- Explain the relationship between Dalton's postulates of atomic theory and the
conservation law of mass in chemical reactions.
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60- Do the atoms shown in the figure to the right have the same atomic number?
Explain your answer.
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61- Calculate: Boron (B) has two naturally occurring isotopes: boron-10 (abundance
= 19.8%, mass = 10.013 amu) and boron-11 (abundance = 80.2%, mass = 11.009
amu). Calculate the atomic mass of boron.
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62- Calculate: Copper has two isotopes Cu-63 (abundance = 69.2%, mass = 62.930
amu) and Cu-65 (abundance = 30.8%, mass = 64.928 amu). Calculate the atomic
mass of copper.
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63- Given the table below
Determine the number of protons, electrons, and neutrons for isotopes b and c
in the table above. Name each isotope, and write its symbol.
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64- An atom has a mass number of 55. Its number of neutrons is the sum of its atomic
number and five. How many protons, neutrons, and electrons does this atom
have? What is the identity of this atom?
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GOOD LUCK
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