📝 Chemistry Topic 2: The Atom Practice Quiz (Google
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Part I: Practice Quiz (10 Multiple Choice Questions)
Instructions: Choose the best answer for each question.
1. You stir table salt (NaCl) into water until it completely dissolves and is clear. The
resulting liquid substance is best classified as a:
A. Element
B. Compound
C. Heterogeneous Mixture
D. Homogeneous Mixture (Solution)
2. Which subatomic particles are primarily responsible for the majority of an atom's mass?
A. Electrons and Protons
B. Protons and Neutrons
C. Neutrons and Ions
D. Only Protons
3. The observation during Rutherford's Gold Foil Experiment that most alpha particles
passed straight through the foil suggested that the atom is primarily:
A. Positively charged
B. Dense and solid
C. Composed of fixed electron shells
D. Empty space
4. An isotope of an element has 24 protons and a mass number of 52. How many neutrons
are present in this atom?
A. 24
B. 28
C. 52
D. 76
5. Which of the following pure substances can be chemically broken down into simpler
substances?
A. An Element
B. A Compound
C. A Homogeneous Mixture
D. A Heterogeneous Mixture
6. According to the rules for drawing a Bohr diagram, the electron shells that are outside
the innermost shell (shell 1) have a maximum capacity of how many electrons?
A. Two
B. Four
C. Six
D. Eight
Docs Format)
You can copy and paste the text below directly into a Google Docs document.
Part I: Practice Quiz (10 Multiple Choice Questions)
Instructions: Choose the best answer for each question.
1. You stir table salt (NaCl) into water until it completely dissolves and is clear. The
resulting liquid substance is best classified as a:
A. Element
B. Compound
C. Heterogeneous Mixture
D. Homogeneous Mixture (Solution)
2. Which subatomic particles are primarily responsible for the majority of an atom's mass?
A. Electrons and Protons
B. Protons and Neutrons
C. Neutrons and Ions
D. Only Protons
3. The observation during Rutherford's Gold Foil Experiment that most alpha particles
passed straight through the foil suggested that the atom is primarily:
A. Positively charged
B. Dense and solid
C. Composed of fixed electron shells
D. Empty space
4. An isotope of an element has 24 protons and a mass number of 52. How many neutrons
are present in this atom?
A. 24
B. 28
C. 52
D. 76
5. Which of the following pure substances can be chemically broken down into simpler
substances?
A. An Element
B. A Compound
C. A Homogeneous Mixture
D. A Heterogeneous Mixture
6. According to the rules for drawing a Bohr diagram, the electron shells that are outside
the innermost shell (shell 1) have a maximum capacity of how many electrons?
A. Two
B. Four
C. Six
D. Eight
