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Grade 9 Chemistry Test
Test Description: For students currently enrolled in SNC1D at OTHS!
Instructions: Answer all questions to get your test result.
1) Which of the following is the best description of the model of the atom.
A
A positive nucleus with negative electrons in energy levels.
B
Material with positive and negative charges on its surface.
C
a mass of positive charge with negative electrons stuck throughout it.
D
a central nucleus with orbiting electrons.
2) What particles make up the atomic nucleus?
A
protons and neutrons
B
neutrons
C
electrons
D
protons
3) Which statement about the relative number of subatomic particles in an atom is always true?
A
The atomic number is equal to the number of protons
B
The number of neutrons is equal to the mass number of an atom.
C
The number of electrons equals the number of neutrons in a neutral atom.
D
The mass number is equal to the total number of protons and electrons.
4) In which part of an atom is most of the mass located?
A
the energy levels surrounding the nucleus
B
the electrons
C
the protons
D
the nucleus
5) What is the mass number of an atom with 6 protons and 7 neutrons.
A
6
B
13
C
0.86 amu
D
7
6) Which of the following symbols represents the element with an atomic number of 14?
A
Ni
B
Si
C
C
D
N
7) How many electrons does an atom have if the mass number is 15 and the number of neutrons is 7?
A
8
B
15
C
22
D
7
8) Which statement about elements and their relationship in the periodic table is true?
A
Calcium and magnesium are alkaline-earth metals
B
Potassium and phosphorus are in the same group
C
Chlorine and iodine are alkali metals
D
Boron and silicon are in the same period
9) Who discovered that neutrons were part of the atom?
A
Bohr
B
Dalton
C
Rutherford
D
Chadwick
10) Who discovered that electrons were part of the atom?
A
Democritus
B
Dalton
C
Faraday
D
Mendeleev
*select an answer for all questions
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