Grade 9 Chemistry Quiz

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Daniel P, MSEd, Science |
Science Education
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Grade 9 Chemistry Quiz - Quiz

Can you beat this Grade 9 chemistry test? Atoms are the smallest and main building blocks of ordinary matter, and they join together to form molecules that make the objects around us. In 9th grade chemistry, we got to dive deeper into the makeup and the elements as a whole. Are you ready for that end-year exam? Take the chemistry quiz for grade 9 and review all that you have covered so far. You can also play the quiz with your friend for a fun learning time together. Good Luck with your exams!


Questions and Answers
  • 1. 

    Elements consist of a single type of atom. 

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Elements are substances that cannot be broken down into simpler substances by chemical means. Each element is made up of only one type of atom. For example, oxygen is an element that consists of only oxygen atoms, and gold is an element that consists of only gold atoms. 

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  • 2. 

    As you move left along with the periodic table, the atomic number of the elements tends to

    • A.

      Increase

    • B.

      Decrease

    • C.

      Stay the Same

    • D.

      Undefined

    Correct Answer
    B. Decrease
    Explanation
    As you move left along the periodic table, the atomic number of the elements tends to decrease. This is because elements on the left side of the periodic table have fewer protons in their nucleus, which determines the atomic number. 

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  • 3. 

    Which of the following is NOT an indicator of a Chemical Reaction?

    • A.

      Change of colour

    • B.

      Gas/Bubbles form

    • C.

      It becomes poisonous.

    • D.

      Creates heat/light

    • E.

      Scent changes

    Correct Answer
    C. It becomes poisonous.
    Explanation
    A chemical reaction does not necessarily result in the formation of a poisonous substance. While a chemical reaction can cause changes in color, the formation of gas or bubbles, the release of heat or light, and a change in scent, the production of a poisonous substance is not a universal indicator of a chemical reaction.

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  • 4. 

    Which element of the below is the Bohr-Rutherford diagram above representing? 

    • A.

      Neon

    • B.

      Magnesium

    • C.

      Sulfur

    • D.

      Oxygen

    Correct Answer
    A. Neon
    Explanation
    In the Bohr-Rutherford arrangement of neon, the atom has a nucleus at its center containing 10 protons. Neon has two electron shells, with the first shell holding 2 electrons and the second holding 8 electrons, achieving a stable and complete octet in the outermost shell. This arrangement makes neon an inert gas, as it satisfies the octet rule and is generally unreactive.

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  • 5. 

    An Ionic compound is the result of the bonding of

    • A.

      Two metals

    • B.

      Two nonmetals

    • C.

      A metal and a nonmetal

    • D.

      Two distinctly similar metals

    Correct Answer
    C. A metal and a nonmetal
    Explanation
    An ionic compound forms through the bonding of a metal and a nonmetal. Ionic bonds involve the transfer of electrons from the metal to the nonmetal, resulting in the formation of positively charged cations and negatively charged anions. The electrostatic attraction between these oppositely charged ions forms the ionic compound.

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  • 6. 

    What happens/is likely to happen if the atoms within an element have full valence shells?

    • A.

      They are likely to bond with other elements more easily.

    • B.

      They are unlikely to bond with other elements.

    • C.

      They will be labeled as "unstable."

    • D.

      They will explode.

    Correct Answer
    B. They are unlikely to bond with other elements.
    Explanation
    When the atoms within an element have full valence shells, it means that they have achieved a stable electron configuration. This stability makes it unlikely for these atoms to bond with other elements because they do not need to gain, lose, or share electrons to achieve a more stable configuration. 

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  • 7. 

    How many valence electrons does an atom require to have a full shell?

    • A.

      3

    • B.

      8

    • C.

      16

    • D.

      100

    Correct Answer
    B. 8
    Explanation
    An atom requires 8 valence electrons to have a full shell. The octet rule states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with 8 electrons in their outermost shell, which is the most stable electron configuration. This is known as achieving a full shell or achieving the noble gas configuration. 

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  • 8. 

    Beryllium (Valence electrons: 2) more likely to bond with 

    • A.

      Sulfur (Valence electrons: 6)

    • B.

      Neon (Valence electrons: 8)

    • C.

      Both of them

    • D.

      None of the above

    Correct Answer
    A. Sulfur (Valence electrons: 6)
    Explanation
    Beryllium is more likely to bond with sulfur because they have a compatible number of valence electrons. Beryllium has 2 valence electrons, while sulfur has 6 valence electrons. In order to achieve a stable electron configuration, beryllium can donate its 2 valence electrons to sulfur, forming an ionic bond. This allows both atoms to achieve a full outer electron shell. Neon, on the other hand, already has a full outer electron shell with 8 valence electrons, so it is less likely to form a bond with beryllium. Neon is also a noble gas; noble gases usually do not bond with other elements.

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  • 9. 

    Which and how many atoms do Hydrogen Peroxide (H2O2) consist of?

    • A.

      Four Oxygen, Two Hydrogen

    • B.

      Two Hydrogen, Two Oxygen

    • C.

      One Hydrogen, Three Oxygen

    • D.

      Two Oxygen, One Hydrogen

    Correct Answer
    B. Two Hydrogen, Two Oxygen
    Explanation
    Hydrogen peroxide (H2O2) is a chemical compound composed of two hydrogen (H) atoms and two oxygen (O) atoms. The chemical structure of hydrogen peroxide can be represented as H-O-O-H, illustrating the arrangement of the atoms. The oxygen atoms are connected by a single bond, and each oxygen atom is also bonded to a hydrogen atom. The presence of peroxide linkage (O-O) contributes to the unique properties of hydrogen peroxide, and it is commonly known for its use as a disinfectant and bleach.

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Daniel P |MSEd, Science |
Science Education
Dan brings over a decade of dedicated experience as an educator in New York, specializing in the fields of life and physical science. His expertise lies in biology, geology, and meteorology. Demonstrating a commitment to imparting scientific knowledge, Dan takes pleasure in making the learning of science an enjoyable experience for his students.
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