Chemistry Review Grade 9 Science

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| By Kauffmg
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Chemistry Review Grade 9 Science - Quiz

Review of subatomic particle and ion and isotopes families and density


Questions and Answers
  • 1. 

    this subatomic particle has a positive charge

    • A.

      Proton

    • B.

      Neutron

    • C.

      Electron

    • D.

      Andreon

    • E.

      Vladon

    Correct Answer
    A. Proton
    Explanation
    A proton is a subatomic particle that carries a positive charge. It is found in the nucleus of an atom along with neutrons. Electrons, on the other hand, carry a negative charge and orbit around the nucleus. Therefore, the correct answer is proton.

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  • 2. 

    This subatomic particle has the smallest mass

    • A.

      Proton

    • B.

      Neutron

    • C.

      Electron

    • D.

      Emitron

    • E.

      Stefatron

    Correct Answer
    C. Electron
    Explanation
    The electron has the smallest mass compared to the other subatomic particles listed. Protons and neutrons have approximately the same mass, which is much larger than that of an electron. Emitron and stefatron are not recognized subatomic particles, so they can be ruled out as options. Therefore, the electron is the correct answer as it has the smallest mass.

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  • 3. 

    This subatomic particle has a neutral charge

    • A.

      Proton

    • B.

      Neutron

    • C.

      Electron

    • D.

      Madetron

    • E.

      Maron

    Correct Answer
    B. Neutron
    Explanation
    Neutrons are subatomic particles that have a neutral charge, meaning they do not have a positive or negative charge. Protons have a positive charge, electrons have a negative charge, and madetron and maron are not known subatomic particles. Therefore, the correct answer is neutron.

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  • 4. 

    This subatomic particle has a negative charge

    • A.

      Jakotron

    • B.

      Dilisitron

    • C.

      Proton

    • D.

      Neutron

    • E.

      Electron

    Correct Answer
    E. Electron
    Explanation
    The electron is a subatomic particle that carries a negative charge. It is one of the fundamental particles that make up atoms. Electrons are found in the electron cloud surrounding the nucleus of an atom and are responsible for the chemical behavior of elements. They play a crucial role in various phenomena such as electricity, magnetism, and chemical reactions.

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  • 5. 

    A charged atom is called

    • A.

      A yron

    • B.

      An ion

    • C.

      A chargon

    • D.

      An isotope

    • E.

      A lucon

    Correct Answer
    B. An ion
    Explanation
    An ion is a charged atom because it has gained or lost one or more electrons, resulting in an imbalance between the number of protons and electrons. This imbalance creates a positive or negative charge, making the atom an ion.

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  • 6. 

    How many neutrons does carbon-14 have?

    • A.

      6

    • B.

      7

    • C.

      8

    • D.

      14

    • E.

      0

    Correct Answer
    C. 8
    Explanation
    Carbon-14 is an isotope of carbon, meaning it has the same number of protons but a different number of neutrons. The atomic number of carbon is 6, which represents the number of protons in its nucleus. Since the question asks about the number of neutrons in carbon-14, which has an atomic number of 6, we subtract 6 from the atomic mass of carbon-14, which is 14. This gives us 8, indicating that carbon-14 has 8 neutrons.

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  • 7. 

    How many neutrons does He-3 have?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    • E.

      0

    Correct Answer
    A. 1
    Explanation
    He-3 is an isotope of helium, which means it has the same number of protons as regular helium but a different number of neutrons. The atomic number of helium is 2, which means it has 2 protons. Since He-3 has 1 neutron, the total number of neutrons in He-3 is 1.

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  • 8. 

    How many protons does C-13 have?

    • A.

      13

    • B.

      6

    • C.

      7

    • D.

      8

    • E.

      0

    Correct Answer
    B. 6
    Explanation
    C-13 is the isotope of carbon with a mass number of 13, which indicates the total number of protons and neutrons in the nucleus. Since the atomic number of carbon is 6, it means that C-13 has 6 protons.

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  • 9. 

    What charge do lithium ions have?

    • A.

      1-

    • B.

      1+

    • C.

      2-

    • D.

      2+

    • E.

      0

    Correct Answer
    B. 1+
    Explanation
    Lithium ions have a positive charge of 1+. This means that they have lost one electron, resulting in a net positive charge. The positive charge is indicated by the "+" symbol.

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  • 10. 

    What charge do oxygen ions have?

    • A.

      1+

    • B.

      1-

    • C.

      2+

    • D.

      2-

    • E.

      8+

    Correct Answer
    D. 2-
    Explanation
    Oxygen ions have a charge of 2- because oxygen typically has 6 valence electrons and it gains 2 electrons to achieve a stable octet configuration. This results in a net charge of -2.

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  • 11. 

    Why do atoms form ions

    • A.

      To attract other ions

    • B.

      To get charged

    • C.

      To have a full (stable) outer shell

    • D.

      To form attractions

    • E.

      Nobody knows

    Correct Answer
    C. To have a full (stable) outer shell
    Explanation
    Atoms form ions in order to have a full and stable outer shell. A full outer shell is achieved by either gaining or losing electrons. By forming ions, atoms can either gain or lose electrons to achieve a stable electron configuration, similar to that of a noble gas. This stability is important as it allows atoms to become more chemically stable and less reactive, making them more likely to form attractions with other ions and create compounds.

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  • 12. 

    How many electrons are there on the outer shell of a neutral potassium atom

    • A.

      1

    • B.

      2

    • C.

      7

    • D.

      19

    • E.

      39

    Correct Answer
    A. 1
    Explanation
    The outer shell of an atom is also known as the valence shell, which determines the chemical properties of the element. In the case of a neutral potassium atom, the atomic number is 19, indicating that it has 19 electrons. The electron configuration of potassium is 2-8-8-1, meaning that there is only 1 electron on the outer shell. Therefore, the correct answer is 1.

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  • 13. 

    The atomic number is always the same as the number of

    • A.

      Protons +neutrons

    • B.

      Protons

    • C.

      Neutrons

    • D.

      Electrons

    • E.

      Joeyons

    Correct Answer
    B. Protons
    Explanation
    The atomic number of an element represents the number of protons in the nucleus of an atom. Protons are positively charged particles, and their number determines the element's identity. Neutrons, on the other hand, are neutral particles found in the nucleus, and their number can vary, resulting in different isotopes of an element. Electrons, which are negatively charged particles, orbit the nucleus and their number can also vary, resulting in ions. However, the atomic number specifically refers to the number of protons, making "protons" the correct answer.

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  • 14. 

    The atomic mass is the same as the number of

    • A.

      Protons + neutrons

    • B.

      Protons

    • C.

      Neutrons

    • D.

      Electrons

    • E.

      Evans

    Correct Answer
    A. Protons + neutrons
    Explanation
    The atomic mass of an atom is determined by the sum of its protons and neutrons. Protons carry a positive charge and are located in the nucleus of an atom, while neutrons have no charge and are also found in the nucleus. Electrons, on the other hand, have a negative charge and orbit around the nucleus. Since the question asks for the correct answer, it is clear that the atomic mass is equal to the sum of protons and neutrons, as electrons do not contribute significantly to the overall mass of an atom.

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  • 15. 

    This family of gases does not react.

    Correct Answer
    noble gases
    Explanation
    Noble gases are a group of chemical elements with very low reactivity due to their complete valence electron shells. This group includes helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Because their outermost electron shell is full, they do not tend to form chemical bonds with other elements.

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  • 16. 

    As you move from left to right in a period the atomic radius

    Correct Answer
    decreases
    Explanation
    As you move from left to right in a period, the atomic radius decreases. This is because the number of protons in the nucleus increases, resulting in a stronger attractive force on the electrons. As a result, the electrons are pulled closer to the nucleus, causing the atomic radius to decrease. Additionally, the increase in the number of electrons in the same energy level also contributes to the decrease in atomic radius.

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  • 17. 

    As you move down the halogens, the reactivity

    Correct Answer
    decreases
    Explanation
    As you move down the halogens group on the periodic table, the reactivity decreases. This is because the atomic size increases down the group, leading to a weaker attraction between the outermost electron and the nucleus. As a result, it becomes easier for the halogens to gain an electron and form a stable negative ion. Therefore, the ability of halogens to undergo chemical reactions and form compounds decreases as you move down the group, indicating a decrease in reactivity.

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  • 18. 

    An object with a greater density than the liquid  it is placed in will

    Correct Answer
    sink
    Explanation
    An object with a greater density than the liquid it is placed in will sink because density is a measure of how much mass is contained in a given volume. If the object has a greater density than the liquid, it means that it has more mass packed into a smaller volume compared to the liquid. This causes the object to be heavier than the liquid and therefore it sinks.

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  • 19. 

    As you go down a column in the periodic table, the number of shells

    Correct Answer
    increases
    Explanation
    As you move down a column in the periodic table, the number of shells increases. Each row in the periodic table represents a new energy level or shell. As you move from the top to the bottom of a column, the electrons occupy higher energy levels and therefore more shells. This is because the atomic radius increases down a group, allowing for more space for additional electron shells. Therefore, the number of shells increases as you go down a column in the periodic table.

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  • 20. 

    Which type of chemical bond involves the sharing of electrons between atoms?

    • A.

      Ionic

    • B.

      Covalent

    • C.

      Metallic

    • D.

      Hydrogen

    Correct Answer
    B. Covalent
    Explanation
    Covalent bonds form when atoms share electrons to achieve a stable electron configuration. This is common in molecules like H2O (water).

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jun 12, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 08, 2009
    Quiz Created by
    Kauffmg
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