Chemistry Multiple Choice Quiz

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Questions and Answers

How many neutrons does carbon-14 have?

What is the mass number of an atom with 11 protons and 12 neutrons?

An atom with a charge of -2 has 18 electrons and 16 neutrons. How many protons does it have?

What does the atomic number (Z) represent?

Number of protons Signup and view all the answers

Which scientist is credited with isolating a gas by heating mercury oxide?

Joseph Priestley Signup and view all the answers

Who is considered the 'Father of Modern Chemistry'?

Antoine Lavoisier Signup and view all the answers

Who proposed the atomic theory, including the Law of Multiple Proportions?

John Dalton Signup and view all the answers

Which model first proposed that electrons move in circular orbits?

Bohr's model / Planetary Model Signup and view all the answers

The planetary model of the atom was proposed by:

Niels Bohr Signup and view all the answers

Who discovered the neutron?

James Chadwick Signup and view all the answers

What is the correct name for H₂SO₄?

Sulfuric acid Signup and view all the answers

Which naming system uses Roman numerals to indicate the charge of a metal ion?

Stock method Signup and view all the answers

What is the correct formula for iron (III) chloride?

FeCl₃ Signup and view all the answers

Which of the following is the correct name for Mg(OH)₂?

Magnesium hydroxide Signup and view all the answers

What is the correct name for the polyatomic ion NO₃⁻?

Nitrate Signup and view all the answers

What are the two fundamental kinds of chemical bonds that hold atoms in a compound?

Ionic and covalent Signup and view all the answers

What type of compounds do ionic bonds give rise to?

Ionic compounds Signup and view all the answers

Which type of bond involves a sharing of electrons between atoms?

Covalent bond Signup and view all the answers

Which model type best represents the relative space occupied by atoms?

Space-filling model Signup and view all the answers

Study Notes

Multiple Choice Questions

Question 1: Which of the following is an example of an ion?
- Correct Answer: Na+
- Explanation: An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. Na+ is a sodium ion, having lost an electron. O₂ is a molecule of oxygen, and H₂O is a water molecule.
Question 2: What is the charge of an electron?
- Correct Answer: Negative
- Explanation: Electrons have a negative electric charge.
Question 3: How do isotopes of an element differ?
- Correct Answer: Mass number
- Explanation: Isotopes of an element have the same number of protons (atomic number) but different numbers of neutrons, resulting in different mass numbers.
Question 4: What is the primary use of deuterium (hydrogen-2) isotope?
- Correct Answer: Nuclear reactors
- Explanation: Deuterium is an important component in nuclear reactors for its ability to sustain nuclear reactions.
Question 7: What is the primary use of iodine-131 isotope in medicine?
- Correct Answer: Thyroid disorders
- Explanation: Iodine-131 is used in medicine to treat and diagnose thyroid disorders.
Question 10: If an atom has an atomic number of 15 and a mass number of 31, how many neutrons does it have?
- Correct Answer: 16
- Explanation: The mass number is the sum of protons and neutrons. Subtracting the atomic number (number of protons) from the mass number gives the number of neutrons.
Question 11: How is the mass of an electron described relative to other subatomic particles?
- Correct Answer: Lighter than a proton
- Explanation: Electrons have significantly less mass than protons or neutrons.
Question 1: What is its chemical formula if a compound consists of 2 hydrogen atoms and 1 oxygen atom?
- Correct Answer: H₂O
- Explanation: Chemical formulas display the types and number of atoms in a compound.
Question 2: Which suffix is used for the lower oxidation state in the classical naming method?
- Correct Answer: -ous
- Explanation: In the classical naming of ionic compounds, the suffix "-ous" is used for a lower oxidation state of a metal element, while "-ic" is used for the higher oxidation state.
Question 3: What is the correct name for H₂SO₄ ?
- Correct Answer: Sulfuric acid
- Explanation: H₂SO₄ is a common strong acid, named sulfuric acid.
Question 4: Which naming system uses Roman numerals to indicate the charge of a metal ion?
- Correct Answer: Stock method
- Explanation: The Stock method uses Roman numerals to specify the different possible oxidation states of transition metals.
Question 5: What is the correct formula for iron (III) chloride?
- Correct Answer: FeCl₃
- Explanation: Iron(III) chloride has an iron ion with a +3 charge, and chlorine ions with a -1 charge each. This gives the required formula.
Question 6: Which of the following is the correct name for Mg(OH)₂?
- Correct Answer: Magnesium hydroxide
- Explanation: Mg(OH)₂ is magnesium hydroxide.
Question 7: What is the correct formula for copper (II) sulfate pentahydrate?
- Correct Answer: CuSO₄⋅5H₂O
- Explanation: This compound contains copper(II) ions, sulfate ions and water molecules. The formula shows this.
Question 8: What is the correct name for the polyatomic ion NO₃⁻?
- Correct Answer: Nitrate
- Explanation: The polyatomic ion NO₃⁻ is the nitrate ion.
Question 9.1, 9.2: What are the two fundamental kinds of chemical bonds that hold atoms in a compound? What type of compounds do ionic bonds give rise to?
- Correct Answers:
  - Ionic and covalent
  - Ionic compounds
Question 10.1, 10.2: Which type of bond involves a sharing of electrons between atoms? What do lines in a skeletal formula typically represent?
- Correct Answers:
  - Covalent bond
  - Bonds

Identification Questions

Question 1: How many neutrons does carbon-14 have?
- Answer: 8
- Explanation: Carbon-14 has an atomic number of 6, meaning it has 6 protons, and a mass number of 14, meaning it has 14 - 6 = 8 neutrons
Question 2: What is the mass number of an atom with 11 protons and 12 neutrons?
- Answer: 23
- Explanation: The mass number is the total number of protons and neutrons in an atom. 11 + 12 = 23
Question 3: Who is considered the "Father of Modern Chemistry"?
- Answer: Antoine Lavoisier
- Explanation: Lavoisier's work was crucial in establishing many of the foundational principles of modern chemistry.
Question 4: Which model first proposed that electrons move in circular orbits?
- Answer: Bohr's model
- Explanation: Neils Bohr's model described electrons orbiting the nucleus in specific energy levels, resembling planets orbiting the sun.
Question 5: The planetary model of the atom was proposed by:
- Answer: Niels Bohr
- Explanation: Bohr refined the understanding of the atom, incorporating aspects of quantum theory.
Question 6: Who discovered the neutron?
- Answer: James Chadwick
- Explanation: James Chadwick's experiment confirmed the existence of the neutron.
Question 7: Which scientist is credited with isolating a gas by heating mercury oxide?
- Answer: Joseph Priestley
Question 8: What was the main contribution of the quantum mechanical model?
- Answer: Explanation of electron behavior
Question 9: What does atomic number (Z) represent?
- Answer: The number of protons in an atom
Question 10: Which model type best represents the relative space occupied by atoms?
- Answer: Space-filling model
- Explanation: The space-filling model depicts the size and shape of atoms in three dimensions.

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Description

Test your knowledge of key chemistry concepts with this multiple choice quiz. Questions cover ions, electron charges, isotopes, and their uses. Perfect for students looking to reinforce their understanding of chemistry fundamentals.